DOI: 10.1063/1.457762. Trapping-mediated dissociative chemisorption of ethane on Ir(110)-(1×2)

Trapping-mediated dissociative chemisorption of ethane on Ir(110)-(1×2)

10.1063/1.457762

Crossref journal-article

AIP Publishing

The Journal of Chemical Physics (317)

Abstract

Evidence is presented to support a trapping-mediated dissociative chemisorption mechanism for ethane interacting with an Ir(110)-(1×2) surface. The data were obtained from supersonic molecular-beam measurements with an incident kinetic energy Ei ranging between 1.2 and 24.1 kcal/mol, a surface temperature Ts between 154 and 500 K, and an incident angle θi between 0° and 45°. For Ei less than approximately 13 kcal/mol, the probability of dissociative chemisorption S0 decreases rapidly with increasing Ts. For a surface temperature of 154 K, S0 decreases with increasing Ei for 1.2≤Ei ≤13.4 kcal/mol, consistent with a trapping-mediated chemisorption mechanism. Indeed, the data also support quantitatively a kinetic model consistent with a trapping-mediated chemisorption mechanism. The difference in the activation energies for desorption and chemisorption from the physically adsorbed, trapped state Ed −Ec is 2.2±0.2 kcal/mol. In the trapping-mediated regime, S0 is found to be rather insensitive to incident angle, scaling with Ei cos0.5 θi .

Bibliography

Mullins, C. B., & Weinberg, W. H. (1990). Trapping-mediated dissociative chemisorption of ethane on Ir(110)-(1Ã2). The Journal of Chemical Physics, 92(7), 4508â4512.

Authors 2

C. B. Mullins (first)
W. H. Weinberg (additional)

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Dates

Type	When
Created	23 years, 1 month ago (July 26, 2002, 9:12 a.m.)
Deposited	1 year, 6 months ago (Feb. 10, 2024, 6:29 a.m.)
Indexed	2 months, 1 week ago (June 27, 2025, 3:44 p.m.)
Issued	35 years, 5 months ago (April 1, 1990)
Published	35 years, 5 months ago (April 1, 1990)
Published Print	35 years, 5 months ago (April 1, 1990)

Funders 0

None

BibTeX

@article{Mullins_1990, title={Trapping-mediated dissociative chemisorption of ethane on Ir(110)-(1×2)}, volume={92}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.457762}, DOI={10.1063/1.457762}, number={7}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Mullins, C. B. and Weinberg, W. H.}, year={1990}, month=apr, pages={4508–4512} }

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