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Determination of the coverage dependent isosteric heat of adsorption of CO on Rh(1 1 1) by high resolution core level photoemission

Smedh, M. LU ; Beutler, A. LU ; Borg, M. LU ; Nyholm, R. LU and Andersen, J. N. LU (2001) In Surface Science 491(1-2). p.115-123
Abstract

High resolution core level photoemission is used to measure the equilibrium coverages of CO on Rh(1 1 1) at different sample temperatures and CO background pressures. Use of the chemical shifts of the C Is binding energy allows us to divide the total CO coverage into separate coverages for the different adsorption sites of CO on Rh(1 1 1). A Clausius-Clapeyron analysis of isosteres constructed from the measured isotherms for the total CO coverage is used to derive the coverage dependence of the isosteric heat of adsorption Eads for this adsorption system. The present results are found to agree well with a recent calculation of the adsorption energy for the Rh(1 1 1)-(2 × 2)-1CO structure at 0.25 ML (monolayer, ML).... (More)

High resolution core level photoemission is used to measure the equilibrium coverages of CO on Rh(1 1 1) at different sample temperatures and CO background pressures. Use of the chemical shifts of the C Is binding energy allows us to divide the total CO coverage into separate coverages for the different adsorption sites of CO on Rh(1 1 1). A Clausius-Clapeyron analysis of isosteres constructed from the measured isotherms for the total CO coverage is used to derive the coverage dependence of the isosteric heat of adsorption Eads for this adsorption system. The present results are found to agree well with a recent calculation of the adsorption energy for the Rh(1 1 1)-(2 × 2)-1CO structure at 0.25 ML (monolayer, ML). Furthermore, the present determination of Eads is consistent with a recent measurement of the zero coverage limit Eads(θ = θ ML) but is inconsistent with some previous determinations of this quantity. The coverage variation of the isosteric heat of adsorption is briefly discussed and put in relation to the relative occupations of different sites by the CO molecules. © 2001 Elsevier Science B.V. All rights reserved.

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author
organization
publishing date
type
Contribution to journal
publication status
published
keywords
Carbon monoxide, Chemisorption, Low index single crystal surfaces, Rhodium, Surface thermodynamics (including phase transitions), Synchrotron radiation photoelectron spectroscopy
in
Surface Science
volume
491
issue
1-2
pages
9 pages
publisher
Elsevier
external identifiers
  • Scopus:0013230529
ISSN
0039-6028
language
English
LU publication?
yes
id
e87282cc-57df-4822-a9fe-f548024b875d
date added to LUP
2016-04-27 16:36:26
date last changed
2016-10-13 05:07:06
@misc{e87282cc-57df-4822-a9fe-f548024b875d,
  abstract     = {<p>High resolution core level photoemission is used to measure the equilibrium coverages of CO on Rh(1 1 1) at different sample temperatures and CO background pressures. Use of the chemical shifts of the C Is binding energy allows us to divide the total CO coverage into separate coverages for the different adsorption sites of CO on Rh(1 1 1). A Clausius-Clapeyron analysis of isosteres constructed from the measured isotherms for the total CO coverage is used to derive the coverage dependence of the isosteric heat of adsorption E<sub>ads</sub> for this adsorption system. The present results are found to agree well with a recent calculation of the adsorption energy for the Rh(1 1 1)-(2 × 2)-1CO structure at 0.25 ML (monolayer, ML). Furthermore, the present determination of E<sub>ads</sub> is consistent with a recent measurement of the zero coverage limit E<sub>ads</sub>(θ = θ ML) but is inconsistent with some previous determinations of this quantity. The coverage variation of the isosteric heat of adsorption is briefly discussed and put in relation to the relative occupations of different sites by the CO molecules. © 2001 Elsevier Science B.V. All rights reserved.</p>},
  author       = {Smedh, M. and Beutler, A. and Borg, M. and Nyholm, R. and Andersen, J. N.},
  issn         = {0039-6028},
  keyword      = {Carbon monoxide,Chemisorption,Low index single crystal surfaces,Rhodium,Surface thermodynamics (including phase transitions),Synchrotron radiation photoelectron spectroscopy},
  language     = {eng},
  number       = {1-2},
  pages        = {115--123},
  publisher    = {ARRAY(0x9ba3a00)},
  series       = {Surface Science},
  title        = {Determination of the coverage dependent isosteric heat of adsorption of CO on Rh(1 1 1) by high resolution core level photoemission},
  volume       = {491},
  year         = {2001},
}