Deeper Insight into Depth-Profiling of Aqueous Solutions Using Photoelectron Spectroscopy
Bjorneholm, Olle ; Werner, Josephina ; Ottosson, Niklas ; Öhrwall, Gunnar LU
; Ekholm, Victor
; Winter, Bernd
; Unger, Isaak
and Soderstrom, Johan
(2014)
In Journal of Physical Chemistry C
118(50).
p.29333-29339
- Abstract
- X-ray photoelectron spectroscopy (XPS) is widely used to probe properties such as molecular stoichiometry, microscopic distributions relative to the surface by so-called depth-profiling, and molecular orientation. Such studies usually rely on the core-level photoionization cross sections being independent of molecular composition. The validity of this assumption has recently been questioned, as a number of gas-phase molecules have been shown to exhibit photon-energy-dependent nonstochiometric intensity oscillations arising from EXAFS-like modulations of the photoionization cross section. We have studied this phenomenon in trichloroethanol in both gas phase and dissolved in water. The gas-phase species exhibits pronounced intensity... (More)
- X-ray photoelectron spectroscopy (XPS) is widely used to probe properties such as molecular stoichiometry, microscopic distributions relative to the surface by so-called depth-profiling, and molecular orientation. Such studies usually rely on the core-level photoionization cross sections being independent of molecular composition. The validity of this assumption has recently been questioned, as a number of gas-phase molecules have been shown to exhibit photon-energy-dependent nonstochiometric intensity oscillations arising from EXAFS-like modulations of the photoionization cross section. We have studied this phenomenon in trichloroethanol in both gas phase and dissolved in water. The gas-phase species exhibits pronounced intensity oscillations, similar to the ones observed for other gas-phase molecules. These oscillations are also observed for the dissolved species, implying that the effect has to be taken into account when performing depth-profiling experiments of solutions and other condensed matter systems. The similarity between the intensity oscillations for gas phase and dissolved species allows us to determine the photoelectron kinetic energy of maximum surface sensitivity, approximate to 100 eV, which lies in the range of pronounced intensity oscillations. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/5194686
- author
- Bjorneholm, Olle
; Werner, Josephina
; Ottosson, Niklas
; Öhrwall, Gunnar
LU
; Ekholm, Victor
; Winter, Bernd
; Unger, Isaak
and Soderstrom, Johan
- organization
- publishing date
- 2014
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Journal of Physical Chemistry C
- volume
- 118
- issue
- 50
- pages
- 29333 - 29339
- publisher
- The American Chemical Society (ACS)
- external identifiers
-
- wos:000346759300046
- scopus:84918813399
- ISSN
- 1932-7447
- DOI
- 10.1021/jp505569c
- language
- English
- LU publication?
- yes
- id
- f57c46fc-43ee-4a46-8eea-173cdd7c0602 (old id 5194686)
- date added to LUP
- 2016-04-01 09:54:30
- date last changed
- 2022-03-19 07:30:46
@article{f57c46fc-43ee-4a46-8eea-173cdd7c0602,
abstract = {{X-ray photoelectron spectroscopy (XPS) is widely used to probe properties such as molecular stoichiometry, microscopic distributions relative to the surface by so-called depth-profiling, and molecular orientation. Such studies usually rely on the core-level photoionization cross sections being independent of molecular composition. The validity of this assumption has recently been questioned, as a number of gas-phase molecules have been shown to exhibit photon-energy-dependent nonstochiometric intensity oscillations arising from EXAFS-like modulations of the photoionization cross section. We have studied this phenomenon in trichloroethanol in both gas phase and dissolved in water. The gas-phase species exhibits pronounced intensity oscillations, similar to the ones observed for other gas-phase molecules. These oscillations are also observed for the dissolved species, implying that the effect has to be taken into account when performing depth-profiling experiments of solutions and other condensed matter systems. The similarity between the intensity oscillations for gas phase and dissolved species allows us to determine the photoelectron kinetic energy of maximum surface sensitivity, approximate to 100 eV, which lies in the range of pronounced intensity oscillations.}},
author = {{Bjorneholm, Olle and Werner, Josephina and Ottosson, Niklas and Öhrwall, Gunnar and Ekholm, Victor and Winter, Bernd and Unger, Isaak and Soderstrom, Johan}},
issn = {{1932-7447}},
language = {{eng}},
number = {{50}},
pages = {{29333--29339}},
publisher = {{The American Chemical Society (ACS)}},
series = {{Journal of Physical Chemistry C}},
title = {{Deeper Insight into Depth-Profiling of Aqueous Solutions Using Photoelectron Spectroscopy}},
url = {{http://dx.doi.org/10.1021/jp505569c}},
doi = {{10.1021/jp505569c}},
volume = {{118}},
year = {{2014}},
}