Adsorption and desorption of CO and H2 on Rh(111): Laser-induced desorption

E. G. Seebauer; A. C.F. Kong; L. D. Schmidt

doi:10.1016/0169-4332(88)90030-X

Adsorption and desorption of CO and H₂ on Rh(111): Laser-induced desorption

E. G. Seebauer, A. C.F. Kong, L. D. Schmidt

Research output: Contribution to journal › Article › peer-review

Abstract

Isosteric heats of adsorption ΔH_ad of CO and sticking coefficients S for CO and H₂ on Rh(111) are determined by laser-induced thermal desorption (LITD) in which a pulsed laser beam is focused onto the surface, and rapid local heating yields a desorption signal that is proportional to the adsorbate coverage θ. ΔH_ad for CO falls from 32.0±2 kcal/mol at low coverage to 14 kcal/mol at saturation, and the desorption pre-exponential factor v_d decreases from 10^14±0.5 to 10¹⁰ s^-1. ΔH_ad, v_d, and S of CO all decline sharply above θ = 0.2, corresponding to the occupation of a second binding state. Sticking coefficients for CO and hydrogen indicate precursor intermediates in adsorption.

Original language	English (US)
Pages (from-to)	163-172
Number of pages	10
Journal	Applied Surface Science
Volume	31
Issue number	1
DOIs	https://doi.org/10.1016/0169-4332(88)90030-X
State	Published - Jan 1988
Externally published	Yes

ASJC Scopus subject areas

Condensed Matter Physics
Surfaces, Coatings and Films
Surfaces and Interfaces

Online availability

10.1016/0169-4332(88)90030-X

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Cite this

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title = "Adsorption and desorption of CO and H2 on Rh(111): Laser-induced desorption",

abstract = "Isosteric heats of adsorption ΔHad of CO and sticking coefficients S for CO and H2 on Rh(111) are determined by laser-induced thermal desorption (LITD) in which a pulsed laser beam is focused onto the surface, and rapid local heating yields a desorption signal that is proportional to the adsorbate coverage θ. ΔHad for CO falls from 32.0±2 kcal/mol at low coverage to 14 kcal/mol at saturation, and the desorption pre-exponential factor vd decreases from 1014±0.5 to 1010 s-1. ΔHad, vd, and S of CO all decline sharply above θ = 0.2, corresponding to the occupation of a second binding state. Sticking coefficients for CO and hydrogen indicate precursor intermediates in adsorption.",

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AU - Schmidt, L. D.

PY - 1988/1

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AB - Isosteric heats of adsorption ΔHad of CO and sticking coefficients S for CO and H2 on Rh(111) are determined by laser-induced thermal desorption (LITD) in which a pulsed laser beam is focused onto the surface, and rapid local heating yields a desorption signal that is proportional to the adsorbate coverage θ. ΔHad for CO falls from 32.0±2 kcal/mol at low coverage to 14 kcal/mol at saturation, and the desorption pre-exponential factor vd decreases from 1014±0.5 to 1010 s-1. ΔHad, vd, and S of CO all decline sharply above θ = 0.2, corresponding to the occupation of a second binding state. Sticking coefficients for CO and hydrogen indicate precursor intermediates in adsorption.

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