In:
Surface and Interface Analysis, Wiley, Vol. 50, No. 12-13 ( 2018-12), p. 1319-1335
Abstract:
The characteristics of photoelectron emission (PE) and X‐ray photoelectron spectroscopy of iron surfaces scratched in different environments were investigated. The scratching environments were air, water, and organic liquids. The PE quantum yields (emitted electrons/photon), Y FD and Y s , were obtained in 2 ways of irradiation of the surface with photon energies: during the light wavelength scan in the range of 300 to 200 nm at 25°C, 200°C, and 339°C and during temperature increase and subsequent decrease scans in the range of 25°C to 339°C under 210‐nm‐light irradiation, respectively. The equation Y FD = αA ( E p − ϕ ) 2 /2 k B 2 , where αA is called the electron photoemission probability, A is identical to the Richardson constant, E p is the incident photon energy, and ϕ is the photothreshold, was applied to the wavelength scan data to obtain αA and ϕ . Additionally, the emission intensity at 210‐nm wavelength ( I 210 ) and the total number of emitted electrons ( N T ) were obtained during the wavelength scan. Arrhenius activation energies obtained for αA , I 210 , and N T were Δ E αA = 0.113 to 0.074 eV, Δ E 210 = 0.085 to 0.054 eV, and Δ E NT = 0.088 to 0.053 eV, respectively. The Δ E 210 and Δ E NT increased with Δ E αA . The dependence of Δ E 210 , Δ E NT , and Δ E αA on the environments was completely different from that of Δ E aUp1 values for the Y s during the temperature increase scan (Up1 scan), which were previously reported to be in the 0.212‐ to 0.035‐eV range. The PE characteristics were explained from the dependence on the O1s component ratio of Z O = O 2− /(OH − + O 2− ) and the acid‐base interaction between the surface Fe −OH groups and the molecules of the liquid environments.
Type of Medium:
Online Resource
ISSN:
0142-2421
,
1096-9918
DOI:
10.1002/sia.v50.12-13
Language:
English
Publisher:
Wiley
Publication Date:
2018
detail.hit.zdb_id:
2023881-2
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