Basic XPS Information Section

The Basic XPS Information Section provides fundamental XPS spectra, BE values, FWHM values, BE tables, overlays of key spectra, histograms and a table of XPS parameters.
The Advanced XPS Information Section is a collection of additional spectra, overlays of spectra, peak-fit advice, data collection guidance, material info,
common contaminants, degradation during analysis, auto-oxidation, gas capture study, valence band spectra, Auger spectra, and more.
Published literature references, and website links are summarized at the end of the advanced section.
→  Periodic Table – HomePage                          XPS Database of Polymers                         → Six (6) BE Tables


Tin (Sn)

Stannum

Cassiterite – SnO2 Tin – Sno  Cylindrite – Pb3Sn4FeSb2S14

 

  Page Index
  • Pure Element Spectra with Peak-fits
  • IMFP and Cross-sections for Pure Element
  • Native Oxide Spectra with Peak-fits
  • Pure Oxide Spectra with Peak-fits
  • Overlays and Valence Band Spectra
  • Six (6) Tables of Chemical State BEs 
  • Histograms of NIST BEs
  • Advanced XPS Information Section
  • Peak-fits and Overlays of Sn Chemical Compounds
  • Quantitation and Atom %s
  • Flood Gun Effects on Native Oxide Spectra
  • Study of UHV Gas Capture after Cleaning
  • Auger Peaks and Spectra
  • Contamination
  • XPS Facts, Guidance, Information
  • Chemical State Spectra from Literature
  • Expert Knowledge & Explanations


Tin (Sno) Metal

Peak-fits, BEs, FWHMs, and Peak Labels

  .
Tin (Sno) Metal
Sn (3d) Spectrum – raw spectrum
ion etched clean		 Tin (Sno) Metal
Peak-fit of Sn (3d) Spectrum
w/o asymm
→  Periodic Table – HomePage  
Tin (Sno) Metal
Sn (3d) Spectrum – extended range 
 Tin (Sno) Metal
Peak-fit of Sn (3d) Spectrum (w asymm)
 

Study for One Electron Breakdown Effect
Tin (Sno) Metal
Sn (4s) Spectrum		 Tin (Sno) Metal
Sn (4p) Spectrum
 

Survey Spectrum of Tin (Sno) Metal
with Peaks Integrated, Assigned and Labelled

 
→  Periodic Table 

XPS Signals for Tin, (Sno) Metal

Spin-Orbit Term,  BE (eV) Value, and Scofield σ for Aluminum Kα X-rays (1486 eV, 8.33 Ang)

Overlaps Spin-Orbit Term BE (eV) Value Scofield σ from 1486 eV X-rays IMFP (TPP-2M) in Å
Sn (3s) 884 3.26 17.2
Sn (3p1/2) 756 4.58 20.7
Fe (2p) overlaps Sn (3p3/2) 714 9.35 20.7
Na (Auger) overlaps Sn (3d3/2) 493.21 10.25 25.0
Sn (3d5/2) 484.79 14.80 25.0
Pb (4f) and P (2p) overlap Sn (4s) 137  0.794 31.7
Mg (2s) overlaps Sn (4p) 87 2.67 32.6
O (2s) overlaps Sn (4d) 25 2.70 ~34

σ:  abbreviation for the term Scofield Photoionization Cross-Section which are used with IMFP and TF to generate RSFs and atom% quantitation

Plasmon Peaks

Auger Peaks

 

Energy Loss    Intrinsic Plasmon Peak:  ~xx eV above peak max
Expected Bandgap for SnO2:  3.5 – 3.7 eV
Work Function for SnO2:  xx eV

*Scofield Cross-Section (σ) for C (1s) = 1.0

→  Periodic Table 

 

Sn (4s) and (4p) Spectra from Sno Metal
Fresh exposed bulk produced by extensive Ar+ ion etching
Checking for one electron breakdown effect

Sn (4s) Sn (4p)

 

 

Valence Band Spectrum from Tin, Sno Metal
 Fresh exposed bulk produced by extensive Ar+ ion etching

 

 

Plasmon Peaks from Sno Metal
 Fresh exposed bulk produced by extensive Ar+ ion etching

Sn (3d) – Extended Range Spectrum Sn (3d) – Extended Range Spectrum – Vertically Zoomed
→  Periodic Table 
 

Sn (LMM) Auger Peaks from Sno Metal
 Fresh exposed bulk produced by extensive Ar+ ion etching
Sno Metal – main Auger peak Sno Metal – full Auger range

Features Observed

  • xx
  • xx
  • xx

→  Periodic Table 
 

Artefacts Caused by Argon Ion Etching

Tin Carbide(s)

can form when ion etched Reactive Metal Surfaces capture
Residual UHV Gases (CO, H2O, CH4 etc)

Argon Trapped in Sno

can form when Argon Ions are used
to removed surface contamination
na na
 

Side-by-Side Comparison of
Sn Native Oxide & Stannic Oxide, SnO2
Peak-fits, BEs, FWHMs, and Peak Labels
Sn Native Oxide SnO2  –  Cassiterite, natural crystal, exposed bulk
Sn (3d) from Sn Native Oxide
Flood Gun OFF
As-Measured, C (1s) at 285.4 eV 		 Sn (3d) from SnO2
Flood Gun OFF
As-Measured, C (1s) at 285.6 eV


→  Periodic Table   
Sn Native Oxide SnO2
C (1s) from Sn Native Oxide
Flood Gun OFF
As-Measured, C (1s) at 285.4 eV 

C (1s) from SnO2 – natural crystal
Flood Gun OFF
As-Measured, C (1s) at 285.6 eV


→  Periodic Table   
Sn Native Oxide SnO2
O (1s) from Sn Native Oxide
Flood Gun OFF
As-Measured, C (1s) at 285.4 eV 

O (1s) from SnO2 – natural crystal
Flood Gun OFF
As-Measured, C (1s) at 285.6 eV
 

→  Periodic Table 
Sn Native Oxide SnO2
Sn (LMM) Auger Peaks from Sn Native Oxide
Flood Gun OFF
As-Measured, C (1s) at 285.4 eV 

Sn (LMM) Auger Peaks from SnO2 – natural crystal
Flood Gun OFF
As-Measured, C (1s) at 285.6 eV

 


Survey Spectrum of Tin (Sn) Native Oxide
with Peaks Integrated, Assigned and Labelled

→  Periodic Table 

 

 


Survey Spectrum of Tin Dioxide, SnO2
with Peaks Integrated, Assigned and Labelled

 

→  Periodic Table  

Overlays of Sn (3d) Spectra for:
Sn Native Oxide and SnO2

Caution: BEs from Grounded Native Oxides can be Misleading if Flood Gun is ON

 Overlay of Sno metal and Sn Native Oxide – Sn (3d)
Native Oxide C (1s) = 285.4 eV  (Flood gun OFF)

  Overlay of Sno metal and SnO2 – Sn (3d)
Flood Gun OFF.  C (1s) = 285.6 eV
Chemical Shift:  2.5 eV

→  Periodic Table  Copyright ©:  The XPS Library 

 

Overlay of Sn (3d)
Sno Metal, Sn Native Oxide, & SnO2 

Features Observed

  • xx
  • xx
  • xx

→  Periodic Table 

 

Valence Band Spectra
Sno, SnO2 

Sno
Ion etched clean		 SnO2 – natural crystal
Flood gun is ON,  Charge referenced so C (1s) = 285.0 eV

Overlay of Valence Band Spectra
for Sno metal and SnO2

Features Observed

  • xx
  • xx
  • xx

→  Periodic Table 

 

Tin Minerals, Gemstones, and Chemical Compounds

 
Herzenbergite – SnS Silesiaite – Ca2FeSn(Si2O7)(Si2O6OH) Ferrowodbinite – FeSnTa2O8 Wickmanite – Mn[Sn(OH)6]

→  Periodic Table 

 

Six (6) Chemical State Tables of Sn (3d5/2) BEs

 

  • The XPS Library Spectra-Base
  • PHI Handbook
  • Thermo-Scientific Website
  • XPSfitting Website
  • Techdb Website
  • NIST Website

→  Periodic Table 

 

Notes of Caution when using Published BEs and BE Tables from Insulators and Conductors:

  • Accuracy of Published BEs
    • The accuracy depends on the calibration BEs used to calibrate the energy scale of the instrument.  Cu (2p3/2) BE can vary from 932.2 to 932.8 eV for old publications 
    • Different authors use different BEs for the C (1s) BE of the hydrocarbons found in adventitious carbon that appears on all materials and samples.  From 284.2 to 285.3 eV
    • The accuracy depends on when the authors last checked or adjusted their energy scale to produce the expected calibration BEs
  • Worldwide Differences in Energy Scale Calibrations
    • For various reasons authors still use older energy scale calibrations 
    • Some authors still adjust their energy scale so Cu (2p3/2) appears at 932.2 eV or 932.8 eV because this is what the maker taught them
    • This range causes BEs in the higher BE end to be larger than expected 
    • This variation increases significantly above 600 eV BE
  • Charge Compensation
    • Samples that behave as true insulators normally require the use of a charge neutralizer (electron flood gun with or without Ar+ ions) so that the measured chemical state spectra can be produced without peak-shape distortions or sloping tails on the low BE side of the peak envelop. 
    • Floating all samples (conductive, semi-conductive, and non-conductive) and always using the electron flood gun is considered to produce more reliable BEs and is recommended.
  • Charge Referencing Methods for Insulators
    • Charge referencing is a common method, but it can produce results that are less reliable.
    • When an electron flood gun is used, the BE scale will usually shift to lower BE values by 0.01 to 5.0 eV depending on your voltage setting. Normally, to correct for this flood gun induced shift, the BE of the hydrocarbon C (1s) peak maximum from adventitious carbon is used to correct for the charge induced shift.
    • The hydrocarbon peak is normally the largest peak at the lowest BE. 
    • Depending on your preference or training, the C (1s) BE assigned to this hydrocarbon peak varies from 284.8 to 285.0 eV.  Other BEs can be as low as 284.2 eV or as high as 285.3 eV
    • Native oxides that still show the pure metal can suffer differential charging that causes the C (1s) and the O (1s) and the Metal Oxide BE to be larger
    • When using the electron flood gun, the instrument operator should adjust the voltage and the XY position of the electron flood gun to produce peaks from a strong XPS signal (eg O (1s) or C (1s) having the most narrow FWHM and the lowest experimentally measured BE. 

→  Periodic Table 

Table #1

Sn (3d5/2) Chemical State BEs from:  “The XPS Library Spectra-Base”

C (1s) BE = 285.0 eV for TXL BEs
and C (1s) BE = 284.8 eV for NIST BEs

Element Atomic # Compound As-Measured by TXL or NIST Average BE Largest BE Hydrocarbon C (1s) BE  Source
Sn 50 Cd2SnO4 (N*3) 458.5 eV 486.1 eV 284.8 eV Avg BE – NIST
Sn 50 Sn (N*02) 484.4 eV 485.2 eV 284.8 eV Avg BE – NIST
Sn 50 Sn – element 484.9 eV 285.0 eV The XPS Library
Sn 50 Ag95Sn5 (N*1) 485.6 eV 284.8 eV Avg BE – NIST
Sn 50 Sn-S (N*3) 485.6 eV 486.4 eV 284.8 eV Avg BE – NIST
Sn 50 SnTe (N*1) 485.6 eV 284.8 eV Avg BE – NIST
Sn 50 SnSe (N*2) 485.7 eV 486.0 eV 284.8 eV Avg BE – NIST
Sn 50 Sn-O (N*5) 486.0 eV 487.0 eV 284.8 eV Avg BE – NIST
Sn 50 SnO2 (N*17) 486.2 eV 487.1 eV 284.8 eV Avg BE – NIST
Sn 50 Pb98Sn2 (N*1) 486.4 eV 284.8 eV Avg BE – NIST
Sn 50 Sn-Cl2 (N*2) 486.5 eV 486.7 eV 284.8 eV Avg BE – NIST
Sn 50 KSnF3 (N*1) 486.7 eV 284.8 eV Avg BE – NIST
Sn 50 Sn-Br2 (N*1) 486.9 eV 284.8 eV Avg BE – NIST
Sn 50 InSnO (ITO) 487.1 eV 285.0 eV The XPS Library
Sn 50 Sn-F2 (N*3) 487.1 eV 487.4 eV 284.8 eV Avg BE – NIST
Sn 50 Sn-O2 487.1 eV 285.0 eV The XPS Library
Sn 50 NaSnF3 (N*1) 487.4 eV 284.8 eV Avg BE – NIST
Sn 50 K2SnF6 (N*1) 487.6 eV 284.8 eV Avg BE – NIST
Sn 50 SnF4 (N*2) 487.9 eV 488.2 eV 284.8 eV Avg BE – NIST
Sn 50 Sn-(OH)2 285.0 eV The XPS Library
Sn 50 SnCO3 285.0 eV The XPS Library

Charge Referencing Notes

  • (N*number) identifies the number of NIST BEs that were averaged to produce the BE in the middle column.
  • The XPS Library uses Binding Energy Scale Calibration with Cu (2p3/2) BE = 932.62 eV and Au (4f7/2) BE = 83.98 eV.  BE (eV) Uncertainty Range:  +/- 0.2 eV
  • Charge Referencing of insulators is defined such that the Adventitious Hydrocarbon C (1s) BE (eV) = 285.0 eV.  NIST uses C (1s) BE = 284.8 eV 
  • Note:   Ion etching removes adventitious carbon, implants Ar (+), changes conductivity of surface, and degrades chemistry of various chemical states.
  • Note:  Ion Etching changes BE of C (1s) hydrocarbon peak.
  • TXL – abbreviation for: “The XPS Library” (https://xpslibrary.com).  NIST:  National Institute for Science and Technology (in USA)

→  Periodic Table 

Table #2

Sn (3d5/2) Chemical State BEs from:  “PHI Handbook”

C (1s) BE = 284.8 eV

→  Periodic Table 

Copyright ©:  Ulvac-PHI

Table #3

Sn (3d5/2) Chemical State BEs from:  “Thermo-Scientific” Website

C (1s) BE = 284.8 eV

Chemical state Binding energy (eV), Sn (3d5/2)
Sn metal 485.2
SnO 486
SnO2 486.6

→  Periodic Table 

Copyright ©:  Thermo Scientific 

Table #4

Sn (3d5/2) Chemical State BEs from:  “XPSfitting” Website

Chemical State BE Table derived by Averaging BEs in the NIST XPS database of BEs
C (1s) BE = 284.8 eV

→  Periodic Table 

Copyright ©:  Mark Beisinger

Table #5

Sn (3d5/2) Chemical State BEs from:  “Techdb.podzone.net” Website

 

XPS Spectra – Chemical Shift | Binding Energy
C (1s) BE = 284.6 eV

XPS(X線光電子分光法)スペクトル 化学状態 化学シフト ケミカルシフト

Element Level Compound B.E.(eV) min max
Sn 3d5/2 Sn 484.9 ±0.4 484.5 ～ 485.2
Sn 3d5/2 SnS 485.7 ±0.3 485.4 ～ 485.9
Sn 3d5/2 Ph4Sn 486.2 ±1.1 485.1 ～ 487.2
Sn 3d5/2 SnO 486.5 ±0.5 486.0 ～ 486.9
Sn 3d5/2 SnO2 486.7 ±0.3 486.4 ～ 486.9
Sn 3d5/2 Na2SnO3 486.7 ±0.5 486.2 ～ 487.2
Sn 3d5/2 Me3SnF 486.8 ±0.3 486.5 ～ 487.0
Sn 3d5/2 Ph3Sn(Halide) 486.8 ±0.5 486.3 ～ 487.3
Sn 3d5/2 Halides 486.9 ±0.2 486.7 ～ 487.0
Sn 3d5/2 Br6Sn(Et4N)2 487.0 ±0.2 486.8 ～ 487.2
Sn 3d5/2 Me2SnF2 487.2 ±0.3 486.9 ～ 487.4

 

→  Periodic Table 

 

Histograms of NIST BEs for Sn (3d5/2) BEs

Important Note:  NIST Database defines Adventitious Hydrocarbon C (1s) BE = 284.8 eV for all insulators.

Histogram indicates:  485.0 eV for Sno based on 23 literature BEs Histogram indicates:  486.5 eV for SnO based on 6 literature BEs

Histogram indicates:  486.7 eV for SnO2 based on 19 literature BEs

 

Table #6


NIST Database of Sn (3d5/2) Binding Energies

NIST Standard Reference Database 20, Version 4.1

Data compiled and evaluated
by
Alexander V. Naumkin, Anna Kraut-Vass, Stephen W. Gaarenstroom, and Cedric J. Powell
©2012 copyright by the U.S. Secretary of Commerce on behalf of the United States of America. All rights reserved.

Important Note:  NIST Database defines Adventitious Hydrocarbon C (1s) BE = 284.8 eV for all insulators.

Element Spectral Line Formula Energy (eV) Reference
Sn 3d5/2 Sn 484.30  Click
Sn 3d5/2 Sn 484.40  Click
Sn 3d5/2 Sn 484.60  Click
Sn 3d5/2 Sn 484.60  Click
Sn 3d5/2 Co20Sn80 484.70  Click
Sn 3d5/2 Sn 484.70  Click
Sn 3d5/2 Sn 484.70  Click
Sn 3d5/2 Zr98Sn1.5Fe0.22 484.70  Click
Sn 3d5/2 SnOx/Sn 484.70  Click
Sn 3d5/2 Sn 484.80  Click
Sn 3d5/2 Sn 484.80  Click
Sn 3d5/2 Sn 484.80  Click
Sn 3d5/2 Sn 484.80  Click
Sn 3d5/2 Zr98Sn1.5Fe0.22 484.80  Click
Sn 3d5/2 Sn 484.85  Click
Sn 3d5/2 Sn 484.87  Click
Sn 3d5/2 Sn 484.87  Click
Sn 3d5/2 Sn 484.90  Click
Sn 3d5/2 Sn 484.90  Click
Sn 3d5/2 Sn 484.90  Click
Sn 3d5/2 Sn 484.92  Click
Sn 3d5/2 Sn 484.94  Click
Sn 3d5/2 Sn 485.00  Click
Sn 3d5/2 Sn 485.00  Click
Sn 3d5/2 Sn 485.00  Click
Sn 3d5/2 Sn 485.00  Click
Sn 3d5/2 [Ge(C6H5)3(Sn(C6H5)3)] 485.10  Click
Sn 3d5/2 [Sn(C6H5)4] 485.10  Click
Sn 3d5/2 Sn 485.10  Click
Sn 3d5/2 Sn 485.20  Click
Sn 3d5/2 Sb95Sn5 485.20  Click
Sn 3d5/2 Au50Sn50 485.22  Click
Sn 3d5/2 O2/Au70.5Sn29.5 485.26  Click
Sn 3d5/2 Au70.5Sn29.5 485.27  Click
Sn 3d5/2 [(C6H5)3SnSSn(C6H5)3] 485.30  Click
Sn 3d5/2 Cd99.6Sn0.4 485.30  Click
Sn 3d5/2 [N(CH3)4][SnCl3] 485.30  Click
Sn 3d5/2 [Mo(CO)3(C5H5)(Sn(CH3)3)] 485.30  Click
Sn 3d5/2 Au90Sn10 485.30  Click
Sn 3d5/2 Au86Sn14 485.35  Click
Sn 3d5/2 [Fe(CO)2(C2H5)Sn(C6H5)3] 485.40  Click
Sn 3d5/2 Cd2SnO4 485.52  Click
Sn 3d5/2 Ag95Sn5 485.60  Click
Sn 3d5/2 [SnOH(C6H5)3] 485.60  Click
Sn 3d5/2 [Sn(C4H9)2]O 485.60  Click
Sn 3d5/2 [Sn(C6H5)3]2O 485.60  Click
Sn 3d5/2 SnO 485.60  Click
Sn 3d5/2 SnS 485.60  Click
Sn 3d5/2 SnTe 485.60  Click
Sn 3d5/2 [Sn(C6H5)4] 485.70  Click
Sn 3d5/2 SnS 485.70  Click
Sn 3d5/2 SnSe 485.70  Click
Sn 3d5/2 [W(CO)3(C5H5)(Sn(CH3)3)] 485.80  Click
Sn 3d5/2 [W(CO)3(Sn(C6H5)3)(C5H5)] 485.80  Click
Sn 3d5/2 [Sn2(C6H5)6] 485.80  Click
Sn 3d5/2 KSnF3 485.80  Click
Sn 3d5/2 [Sn(C6H5)4] 485.85  Click
Sn 3d5/2 SnNbS3 485.90  Click
Sn 3d5/2 [W(CO)3(SnCl(CH3)2)(C5H5)] 486.00  Click
Sn 3d5/2 [Mo(CO)3(Sn(C6H5)3)(C5H5)] 486.00  Click
Sn 3d5/2 Cd2SnO4 486.00  Click
Sn 3d5/2 SnO 486.00  Click
Sn 3d5/2 SnSe 486.00  Click
Sn 3d5/2 SnO2 486.00  Click
Sn 3d5/2 SnSeOx 486.00  Click
Sn 3d5/2 SnSeOx 486.00  Click
Sn 3d5/2 SnSeOx 486.00  Click
Sn 3d5/2 SnSeOx 486.00  Click
Sn 3d5/2 SnSeOx 486.00  Click
Sn 3d5/2 [W(CO)3(Sn(C6H5)3)(C5H5)] 486.10  Click
Sn 3d5/2 [N(CH3)4][SnCl3] 486.10  Click
Sn 3d5/2 SnO2 486.10  Click
Sn 3d5/2 SnO2 486.10  Click
Sn 3d5/2 CdSnO3 486.10  Click
Sn 3d5/2 Sn 486.10  Click
Sn 3d5/2 Cd2SnO4 486.10  Click
Sn 3d5/2 SnO 486.10  Click
Sn 3d5/2 [SnF(C6H5)3] 486.20  Click
Sn 3d5/2 SnO2 486.20  Click
Sn 3d5/2 SnO2 486.20  Click
Sn 3d5/2 Na2SnO3 486.20  Click
Sn 3d5/2 SnMo6S8 486.20  Click
Sn 3d5/2 SnO2 486.20  Click
Sn 3d5/2 SnO2 486.24  Click
Sn 3d5/2 O2/Au70.5Sn29.5 486.28  Click
Sn 3d5/2 [Mo(CO)3(ClSn(CH3)2)(C5H5)] 486.30  Click
Sn 3d5/2 [W(CO)3(CH3)(C5H5)SnCl2] 486.30  Click
Sn 3d5/2 [SnI2(C5H4N)2(CH3)2] 486.30  Click
Sn 3d5/2 [SnCl(C6H5)3] 486.30  Click
Sn 3d5/2 [SnI(C6H5)3] 486.30  Click
Sn 3d5/2 [Sn(C6H5)4] 486.30  Click
Sn 3d5/2 Pt3(SnF3)2((C6H5)2PCH2P(C6H5)2)3[PF6] 486.30  Click
Sn 3d5/2 SnO/C 486.30  Click
Sn 3d5/2 SnO1.15 486.30  Click
Sn 3d5/2 SnS 486.40  Click
Sn 3d5/2 Pb98Sn2 486.40  Click
Sn 3d5/2 SnOx/Sn 486.40  Click
Sn 3d5/2 SnO1.39 486.41  Click
Sn 3d5/2 SnO1.55 486.47  Click
Sn 3d5/2 SnCl2 486.50  Click
Sn 3d5/2 [SnCl(C6H5)3] 486.50  Click
Sn 3d5/2 SnO2 486.50  Click
Sn 3d5/2 SnO2 486.50  Click
Sn 3d5/2 SnO2 486.50  Click
Sn 3d5/2 SnO2 486.50  Click
Sn 3d5/2 Pt3(CO)(SnF3)((C6H5)2PCH2P(C6H5)2)3[PF6] 486.50  Click
Sn 3d5/2 (In2O3)0.95(SnO2)0.05 486.50  Click
Sn 3d5/2 (In2O3)0.90(SnO2)0.10 486.50  Click
Sn 3d5/2 [Sn(C6H5)3(C6H5C(O)CHC(O)C6H5)] 486.55  Click
Sn 3d5/2 SnO2 486.60  Click
Sn 3d5/2 SnO2 486.60  Click
Sn 3d5/2 SnO2 486.60  Click
Sn 3d5/2 SnO2 486.60  Click
Sn 3d5/2 SnO2 486.60  Click
Sn 3d5/2 SnO2 486.60  Click
Sn 3d5/2 SnO 486.60  Click
Sn 3d5/2 SnO2 486.60  Click
Sn 3d5/2 [Sn(C6H5)2(C6H5C(O)CHC(O)C6H5)2] 486.64  Click
Sn 3d5/2 [N(CH3)4]2[SnCl6] 486.70  Click
Sn 3d5/2 [Sn(CH3)3]F 486.70  Click
Sn 3d5/2 SnCl2 486.70  Click
Sn 3d5/2 KSnF3 486.70  Click
Sn 3d5/2 [N(CH3)4]2[PtCl2(SnCl3)2] 486.70  Click
Sn 3d5/2 (NH4)2[SnCl6] 486.70  Click
Sn 3d5/2 SnO2 486.70  Click
Sn 3d5/2 SnO2 486.70  Click
Sn 3d5/2 SnO2 486.70  Click
Sn 3d5/2 SnO2 486.70  Click
Sn 3d5/2 SnO2 486.70  Click
Sn 3d5/2 SnO2 486.70  Click
Sn 3d5/2 Na2SnO3 486.70  Click
Sn 3d5/2 Sn((C5H4N)N=N(C5H4N))Br4 486.70  Click
Sn 3d5/2 Sn(CH3)2((C5H4N)N=N(C5H4N))Br2 486.70  Click
Sn 3d5/2 (IrO2)0.005(SnO2)0.995 486.70  Click
Sn 3d5/2 (IrO2)0.15(SnO2)0.85 486.70  Click
Sn 3d5/2 (IrO2)0.25(SnO2)0.75 486.70  Click
Sn 3d5/2 (IrO2)0.35(SnO2)0.65 486.70  Click
Sn 3d5/2 Sn 486.72  Click
Sn 3d5/2 SnO1.65 486.79  Click
Sn 3d5/2 BaSnCl4 486.80  Click
Sn 3d5/2 Ba(SnCl3)2 486.80  Click
Sn 3d5/2 [N(CH3)4]2[Pt(SnCl3)5] 486.80  Click
Sn 3d5/2 SnO2 486.80  Click
Sn 3d5/2 SnO2 486.80  Click
Sn 3d5/2 Na2SnO3 486.80  Click
Sn 3d5/2 SnS2 486.80  Click
Sn 3d5/2 (IrO2)0.63(SnO2)0.37 486.80  Click
Sn 3d5/2 [Sn(CH3)2(CH3C(O)CHC(O)CH3)2] 486.81  Click
Sn 3d5/2 [Sn(CH3)2(C6H5C(O)CHC(O)C6H5)2] 486.87  Click
Sn 3d5/2 SnBr2 486.90  Click
Sn 3d5/2 [SnCl4(SO(CH3)2)2] 486.90  Click
Sn 3d5/2 [SnCl(C6H5CH2)3] 486.90  Click
Sn 3d5/2 [N(C2H5)4]3[Pt(SnCl3)5] 486.90  Click
Sn 3d5/2 SnO 486.90  Click
Sn 3d5/2 ((CH3)2NH2)6[(SCN)9W3S4SnCl3].0.5H2O 486.90  Click
Sn 3d5/2 Sn[Cr4(OH)7(CH3COO)(OH2)7]0.67H0.4(PO4)2.3H2O 486.90  Click
Sn 3d5/2 Sn(HPO4)2.H2O 486.90  Click
Sn 3d5/2 SnO 486.90  Click
Sn 3d5/2 SnO2 486.95  Click
Sn 3d5/2 [Sn(CH3)2(C9H6NO)2] 486.96  Click
Sn 3d5/2 [N(C2H5)4]2[SnBr6] 487.00  Click
Sn 3d5/2 [Sn(CH3)2SO4] 487.00  Click
Sn 3d5/2 SnF2 487.00  Click
Sn 3d5/2 [SnCl(C6H5)3] 487.00  Click
Sn 3d5/2 [Sn(C6H5)3(C9H6NO)] 487.00  Click
Sn 3d5/2 [SnCl2(CH3)2(SO(CH3)2)2] 487.00  Click
Sn 3d5/2 [Ag(P(C6H5)3)3]SnCl3 487.00  Click
Sn 3d5/2 [W(CO)3(C5H5)]SnCl3 487.00  Click
Sn 3d5/2 [W(CO)3(C5H5)]SnCl3 487.00  Click
Sn 3d5/2 SnO 487.00  Click
Sn 3d5/2 SnO 487.00  Click
Sn 3d5/2 Sn(C6H5)2((C6H5)2PCH2CH2P(C6H5)2)Cl2 487.00  Click
Sn 3d5/2 (Pb(PO3)2)22.5(SnF2)36.6(PbF2)18.3 487.00  Click
Sn 3d5/2 Sn[Cr3(OH)6(CH3COO)(OH2)6]0.8H0.4(PO4)2.H2O 487.00  Click
Sn 3d5/2 [Mo(SnCl3)(CO)3(C5H5)] 487.10  Click
Sn 3d5/2 SnF2 487.10  Click
Sn 3d5/2 [SnCl4(SO(CH3)2)2] 487.10  Click
Sn 3d5/2 [Sn(C6H5)4] 487.10  Click
Sn 3d5/2 [SnF2(CH3)2] 487.10  Click
Sn 3d5/2 SnO2 487.10  Click
Sn 3d5/2 SnO2 487.10  Click
Sn 3d5/2 SnO2 487.10  Click
Sn 3d5/2 SnO2 487.10  Click
Sn 3d5/2 SnO2 487.10  Click
Sn 3d5/2 SnO2 487.10  Click
Sn 3d5/2 (Pb(PO3)2)30(SnF2)26.6(PbF2)13.3 487.10  Click
Sn 3d5/2 (Pb(PO3)2)25(SnF2)33.2(PbF2)16.6 487.10  Click
Sn 3d5/2 (Pb(PO3)2)27.5(SnF2)30(PbF2)15 487.10  Click
Sn 3d5/2 SnO2 487.13  Click
Sn 3d5/2 SnO2 487.13  Click
Sn 3d5/2 SnO2 487.13  Click
Sn 3d5/2 [SnCl(C6H5)(C6H5C(O)CHC(O)C6H5)2] 487.18  Click
Sn 3d5/2 [Sn(Cl2C9H5NO)2] 487.18  Click
Sn 3d5/2 [Co(CO)3SnCl3(As(C6H5)3)] 487.20  Click
Sn 3d5/2 [SnCl3(C2H5)(C5H5N)2] 487.20  Click
Sn 3d5/2 [SnCl3(C6H5)(C5H5N)2] 487.20  Click
Sn 3d5/2 Na2SnO3 487.20  Click
Sn 3d5/2 Zr98Sn1.5Fe0.22 487.20  Click
Sn 3d5/2 SnCl2/Al2O3 487.20  Click
Sn 3d5/2 [Mo(SnCl3)(CO)3(C5H5)] 487.30  Click
Sn 3d5/2 [SnCl4(C5H5N)2] 487.30  Click
Sn 3d5/2 [SnF(C6H5)3] 487.30  Click
Sn 3d5/2 SnO2 487.30  Click
Sn 3d5/2 SnO2 487.30  Click
Sn 3d5/2 [Sn(C6H5)2Cl2] 487.30  Click
Sn 3d5/2 [SnCl6(P(C6H5)4)2] 487.30  Click
Sn 3d5/2 [SnBr4(C4H4N2)] 487.40  Click
Sn 3d5/2 SnF2 487.40  Click
Sn 3d5/2 NaSnF3 487.40  Click
Sn 3d5/2 [Sn(C2H5)2(CH3C(O)C9H5NO)2] 487.40  Click
Sn 3d5/2 [SnCl2(C6H5)2(C4H4N2)] 487.50  Click
Sn 3d5/2 [SnBr(C6H5)3] 487.50  Click
Sn 3d5/2 [SnI(C6H5)3] 487.50  Click
Sn 3d5/2 [SnCl3(CH3)(C4H4N2)] 487.50  Click
Sn 3d5/2 [SnBr6(P(C6H5)4)2] 487.50  Click
Sn 3d5/2 Sn((C6H5)2PCH2CH2P(C6H5)2)Cl4 487.50  Click
Sn 3d5/2 Sn(C6H5)2(C4H4N2)Cl2 487.50  Click
Sn 3d5/2 [SnCl3(C4H9)(C4H4N2)] 487.60  Click
Sn 3d5/2 [SnCl3(C8H17)(C4H4N2)] 487.60  Click
Sn 3d5/2 [SnI4(C4H4N2)] 487.60  Click
Sn 3d5/2 K2SnF6 487.60  Click
Sn 3d5/2 [SnCl2(C6H4CH3)2] 487.60  Click
Sn 3d5/2 [SnCl(C6H5)3] 487.60  Click
Sn 3d5/2 Cd2SnO2 487.60  Click
Sn 3d5/2 [SnCl4(C4H4N2)] 487.80  Click
Sn 3d5/2 Sn(C4H4N2)Cl4 487.80  Click
Sn 3d5/2 [SnCl3(C6H5)(C4H4N2)] 487.90  Click
Sn 3d5/2 SnF4 487.90  Click
Sn 3d5/2 SnO2 488.00  Click
Sn 3d5/2 [SnCl4(C4H4N2)2] 488.10  Click
Sn 3d5/2 [Sn(C9H6NO)2] 488.10  Click
Sn 3d5/2 [Sn(C6H5)Cl3] 488.10  Click
Sn 3d5/2 SnF4 488.20  Click

 

 

Statistical Analysis of Binding Energies in NIST XPS Database of BEs

 

 

→  Periodic Table 

 

Advanced XPS Information Section

Expert Knowledge, Spectra, Features, Guidance and Cautions  

for XPS Research Studies on Tin Materials

 

 

Expert Knowledge Explanations

→  Periodic Table 

 

Tin Chemical Compounds


Peak-fits and Overlays of Chemical State Spectra

Pure Tin, Sno:  Sn (3d)
Cu (2p3/2) BE = 932.6 eV		 SnO2:  Sn (3d)
C (1s) BE = 285.0 eV		 SnF4: Sn (3d)
C (1s) BE = 285.0 eV

Features Observed

  • xx
  • xx
  • xx

→  Periodic Table 

 

Overlay of Sn (3d) Spectra shown Above

C (1s) BE = 285.0 eV

 

Chemical Shift between Sn and SnO2:  2.6 eV
 Chemical Shift between Sn and SnF4:  3.6 eV

 

Chemical Shift between Sn and SnO2:  2.6 eV
Chemical Shift between Sn and SnF2:  2.7 eV
 Chemical Shift between Sn and SnF4:  3.6 eV

→  Periodic Table 

 

Tin Oxide, SnO2
single crystal, natural, Casserite

Survey Spectrum from SnO2
Flood gun is OFF, C (1s) BE = 285.6 eV
 Sn (3d) Chemical State Spectrum from SnO2
Flood gun is OFF, C (1s) BE = 285.6 eV
  . 
O (1s) Chemical State Spectrum from SnO2
Flood gun is OFF, C (1s) BE = 285.6 eV		 C (1s) Chemical State Spectrum from SnO2
Flood gun is OFF, C (1s) BE = 285.6 eV
  . 
Valence Band Spectrum from SnO2
Flood gun is OFF, C (1s) BE = 285.6 eV		 Auger Signals from SnO2
Flood gun is OFF, C (1s) BE = 285.6 eV
  . 
Sn (4s) Chemical State Spectrum from SnO2
Flood gun is OFF, C (1s) BE = 285.6 eV
 Sn (4p) Chemical State Spectrum from SnO2
Flood gun is OFF, C (1s) BE = 285.6 eV


Shake-up Features for
Sno and SnO2

 

 

Multiplet Splitting Features for
Tin Compounds

Sno metal – NO Splitting for Sn (4s) SnO2  – NO Multiplet Splitting Peaks for Sn (4s)

 

 

Features Observed

  • xx
  • xx
  • xx

→  Periodic Table

 

 

 

Tin Chemical Compounds

 

Tin Tetra-fluoride, SnF4
(degrades during XPS)

Survey Sn (3d)
.
C (1s) F (1s)
.
Valence Band Sn (4s) and (4p)

→  Periodic Table 

 

Quantitation Details and Information

Quantitation by XPS is often incorrectly done, in many laboratories, by integrating only the main peak, ignoring the Electron Loss peak, and the satellites that appear as much as 30 eV above the main peak.  By ignoring the electron loss peak and the satellites, the accuracy of the atom% quantitation is in error.

When using theoretically calculated Scofield cross-section values, the data must be corrected for the transmission function effect, use the calculated TPP-2M IMFP values, the pass energy effect on the transmission function, and the peak area used for calculation must include the electron loss peak area, shake-up peak area, multiplet-splitting peak area, and satellites that occur within 30 eV of the main peak.

 

Quantitation from Pure, Homogeneous Binary Compound
composed of Tin – SnO2

This section is focused on measuring and reporting the atom % quantitation that results by using:

  • Scofield cross-sections,
  • Spectra corrected to be free from Transmission Function effects
  • A Pass Energy that does not saturate the detector system in the low KE range (BE = 1000-1400 eV)
  • A focused beam of X-ray smaller than the field of view of the lens
  • An angle between the lens and the source that is ~55 deg that negates the effects of beta-asymmetry
  • TPP-2M inelastic mean free path values, and
  • Either a linear background or an iterated Shirley (Sherwood-Proctor) background to define peak areas

The results show here are examples of a method being developed that is expected to improve the “accuracy” or “reliability” of the atom % values produced by XPS.

→  Periodic Table 

 

 

 

Flood Gun Effect on Native Oxide of Tin, Sn

 

Native Oxide of Tin Sheet – Sample GROUNDED

 

Native Oxide of Tin Sheet – Sample Grounded

Electron Flood Gun:  0 Voltage (FG OFF), Min Voltage versus Max Voltage

Sn (3d) O (1s) C (1s)
→  Periodic Table 

→

 

XPS Study of UHV Gas Captured
by Freshly Ion Etched Tin
Reveals Chemical Shifts and Chemical States that Develop from Highly Reactive Pure Sno

Surface was strongly Ar+ ion etched to remove all contaminants, and
then allowed to react overnight with the UHV Gases – CO, H2, H2O, O2 & CH4
that normally reside inside on the walls of the chamber, on the sample stage,
and on the nearby un-etched surface a total of 10-14 hours.  UHV pump was a Cryopump.
Initial spectra are at the front.  Final spectra are at the rear. Flood gun is OFF.
Sn (3d) Signal
  O (1s) Signal C (1s) Signal
Surface reconstruction produces a 0.07 eV shift overnight UHV gases produce a C (1s) BE at 284.67 eV 
Copyright ©:  The XPS Library

 

AES Study of UHV Gas Captured by Freshly Ion Etched Tin

Tin sheet was ion etched and allowed to react with residual UHV gases overnight – ~14 hr run.

Sn (LMM) Signal:
Sn at front -> SnoX at rear 
Sn KE = 423.9 eV		 O (KLL) Signal:
Sn at front -> SnoX at rear 
O KE = 507.6 eV		 C (KLL) Signal:
Sn at front -> SnoX at rear 
C KE = 266.3 eV
   
     
 

Features Observed

  • xx
  • xx
  • xx

→  Periodic Table 

 

Tin Alloys

   
XxCu XxCu
→  Periodic Table   
XxCu XxCu

 

Copyright ©:  The XPS Library 

 

 

XPS Facts, Guidance & Information

→  Periodic Table 

    Element Tin (Sn)
  
    Primary XPS peak used for Peak-fitting: Sn (3d5/2)  
    Spin-Orbit (S-O) splitting for Primary Peak: Spin-Orbit splitting for “d” orbital, ΔBE = 8.4 eV
  
    Binding Energy (BE) of Primary XPS Signal: 484.8 eV
  
    Scofield Cross-Section (σ) Value: Sn (3d5/2) = 14.60        Sn (3d3/2) = 10.25
  
    Conductivity: Sn resistivity =  
Native Oxide suffers Differential Charing		  
    Range of Sn (3d5/2) Chemical State BEs: 484 – 490 eV range   (Sno to SnF2)  
Signals from other elements that overlap
Sn (3d5/2) Primary Peak:		   Na (Auger)
Bulk Plasmons:   ~xx eV above peak max for pure
Shake-up Peaks: xx
Multiplet Splitting Peaks:   xx

 

 

 General Information about
XXX Compounds:		   xx  
Cautions – Chemical Poison Warning

xx 

Copyright ©:  The XPS Library 

→  Periodic Table 

 

Information Useful for Peak-fitting Sn (3d5/2)

  • FWHM (eV) of Sn (3d5/2) for Pure Sno :  ~0.7 eV using 25 eV Pass Energy after ion etching:
  • FWHM (eV) of Sn (3d5/2) for SnO2:  ~1.3 eV using 50 eV Pass Energy  (before ion etching)
  • Binding Energy (BE) of Primary Signal used for Measuring Chemical State Spectra:  485 eV for Sn (3d5/2) with +/- 0.2 uncertainty
  • List of XPS Peaks that can Overlap Peak-fit results for Sn (3d5/2):  Na (Auger)

→  Periodic Table 

 

General Guidelines for Peak-fitting XPS Signals

  • Typical Energy Resolution for Pass Energy (PE) setting used to measure Chemical State Spectra on Various XPS Instruments
    • Ag (3d5/2) FWHM (eV) = ~0.95 eV for PE 50 on Thermo K-Alpha
    • Ag (3d5/2) FWHM (eV) = ~1.00 eV for PE 80 on Kratos Nova
    • Ag (3d5/2) FWHM (eV) = ~0.95 eV for PE 45 on PHI VersaProbe
  • FWHM (eV) of Pure Elements: Ranges from 0.4 to 1.0 eV across the periodic table
  • FWHM of Chemical State Peaks in any Chemical Compound:  Ranges from 1.1 to 1.6 eV  (in rare cases FWHM can be 1.8 to 2.0 eV)
  • FWHM of Pure Element versus FWHM of Oxide:  Pure element FWHM << Oxide FWHM  (e.g. 0.8 vs 1.5 eV, roughly 2x)
  • If FWHM Greater than 1.6 eV:  When a peak FWHM is larger than 1.6 eV, it is best to add another peak to the peak-fit envelop.
  • BE (eV) Difference in Chemical States: The difference in chemical state BEs is typically 1.0-1.3 eV apart.  In rare cases, <0.8 eV.
  • Number of Peaks to Use:  Use minimum. Do not use peaks with FWHM < 1.0 eV unless it is a or a conductive compound.
  • Typical Peak-Shape:  80% G: 20% L,   or Voigt : 1.4 eV Gaussian and 0.5 eV Lorentzian
  • Spin-Orbit Splitting of Two Peaks (due to Coupling):  The ratio of the two (2) peak areas must be constrained.

Notes:

  • Other Oxidation States can appear as small peaks when peak-fitting
  • Pure element signals normally have asymmetric tails that should be included in the peak-fit.
  • Gaseous state materials often display asymmetric tails due to vibrational broadening.
  • Peak-fits of C (1s) in polymers include an asymmetric tail when the energy resolution is very high.
  • Binding energy shifts of some compounds are negative due to unusual electron polarization.

→  Periodic Table 

 

Contaminants Specific to Tin

  • Tin develops a thick native oxide due to the reactive nature of clean Tin.
  • The native oxide of Sn Ox is 4-6 nm thick.
  • Tin thin films often have a low level of iron (Fe) in the bulk as a contaminant or to strengthen the thin film
  • Tin forms a low level of carbide when the surface is ion etched inside the analysis chamber

 

Commonplace Contaminants

  • Carbon and Oxygen are common contaminants that appear on nearly all surfaces. The amount of Carbon usually depends on handling.
  • Carbon is usually the major contaminant.  The amount of carbon ranges from 5-50 atom%.
  • Carbon contamination is attributed to air-borne organic gases that become trapped by the surface, oils transferred to the surface from packaging containers, static electricity, or handling of the product in the production environment.
  • Carbon contamination is normally a mixture of different chemical states of carbon (hydrocarbon, alcohol or ether, and ester or acid).
  • Hydrocarbon is the dominant form of carbon contamination. It is normally 2-4x larger than the other chemical states of carbon.
  • Carbonate peaks, if they appear, normally appear ~4.5 eV above the hydrocarbon C (1s) peak max BE.
  • Low levels of carbonate is common on many s that readily oxidize in the air.
  • High levels of carbonate appear on reactive oxides and various hydroxides.  This is due to reaction between the oxide and CO2 in the air.
  • Hydroxide contamination peak is due to the reaction with residual water in the lab air or the vacuum.
  • The O (1s) BE of the hydroxide (water) contamination normally appears 0.5 to 1.0 eV above the oxide peak
  • Sodium (Na), Potassium (K), Sulfur (S) and Chlorine (Cl) are common trace to low level contaminants
  • To find low level contaminants it is very useful to vertically expand the 0-600 eV region of the survey spectrum by 5-10X
  • A tiny peak that has 3 or more adjacent data-points above the average noise of the background is considerate to be a real peak
  • Carbides can appear after ion etching various reactive s.  Carbides form due to the residual CO and CH4 in the vacuum.
  • Ion etching can produce low oxidation states of the material being analyzed.  These are newly formed contaminants.
  • Ion etching polymers by using standard Ar+ ion guns will destroy the polymer, converting it into a graphitic type of carbon

→  Periodic Table 

 

Data Collection Guidance

  • Chemical state differentiation can be difficult
  • Collect principal Sn (3d5/2) peak
  • Long time exposures (high dose) to X-rays can degrade various polymers, catalysts, high oxidation state compounds
  • During XPS analysis, water or solvents can be lost due to high vacuum or irradiation with X-rays or Electron flood gun
  • Auger signals can sometimes be used to discern chemical state shifts when XPS shifts are very small

→  Periodic Table 

 

Data Collection Settings for Tin (Sn)

  • Conductivity:  Tin readily develops a native oxide that is sensitive to Flood Gun – Differential Charging Possible – float sample recommended
  • Primary Peak (XPS Signal) used to measure Chemical State Spectra:  Sn (3d5/2) at 485 eV
  • Recommended Pass Energy for Measuring Chemical State Spectrum:  40-50 eV    (Produces Ag (3d5/2) FWHM ~0.7 eV)
  • Recommended # of Scans for Measuring Chemical State Spectrum:  4-5 scans normally   (Use 10-25 scans to improve S/N)
  • Dwell Time:  50 msec/point
  • Step Size:  0.1 eV/point   (0.1 eV/step or 0.1 eV/channel)
  • Standard BE Range for Measuring Chemical State Spectrum:  475-505 eV
  • Recommended Extended BE Range for Measuring Chemical State Spectrum:  470-570 eV
  • Recommended BE Range for Survey Spectrum:  -10 to 1,100 eV   (above 1,100 eV there are no useful XPS signals, except for Ge and Ga)
  • Typical Time for Survey Spectrum:  3-5 minutes for newer instruments, 5-10 minutes for older instruments
  • Typical Time for a single Chemical State Spectrum with high S/N:  5-10 minutes for newer instruments, 10-15 minutes for older instruments 

→  Periodic Table 

 

Effects of Argon Ion Etching

  • Carbides appear after ion etching Sn and various reactive surfaces.  Carbides form due to the presence of residual CO and CH4 in the vacuum.
  • Ion etching can produce low oxidation states of the material being analyzed.  These are newly formed contaminants.
  • Ion etching polymers by using standard Ar+ ion guns will destroy the polymer, converting it into a graphitic type of carbon

 

→  Periodic Table 

Copyright ©:  The XPS Library 
Gas Phase XPS or UPS Spectra

 

Chemical State Spectra from Literature
Overlay for SnO and SnO2 VB
Thermo Web Site

End of File