Formation of molecular hydrogen on a graphite surface via an Eley–Rideal mechanism

Farebrother, A.; Meijer, Anthony J. H. M.; Clary, David C.; Fisher, A. J.

doi:10.1016/s0009-2614(00)00128-7

Cited by 100 publications

(104 citation statements)

References 27 publications

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“…In fact, the potential energy surface for H 2 formation on graphite surface displays no energetic barrier. 34 As a result, the isotope effect on the rate constants of recombination must be negligible and thus the relation of those rate constants should be K H Ӎ K D . Therefore, from Eq.…”

Section: -5mentioning

confidence: 99%

Temperature, composition, and hydrogen isotope effect in the hydrogenation of CO on amorphous ice surface at 10–20K

Hidaka

Kouchi

Watanabe

2007

The Journal of Chemical Physics

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An experiment on the addition reaction of a D atom ͑deuteration͒ to CO on a cold ice surface is performed by deuterium atom exposure of three types of samples ͑pure solid CO, CO-capped H 2 O ice, and CO -H 2 O mixed ice͒ at 10-20 K. The variation of IR absorption spectra for the samples was measured by a Fourier transform infrared spectrometer during exposure to deuterium atoms. Reactions on pure solid CO were observed only at 10 K, while reactions on CO-capped H 2 O ice and CO-H 2 O mixed ice were observed to proceed even at 20 K. This indicates that the coexistence of H 2 O at the surface raises the reactive temperature. In addition, the experiment on H atom exposure was also carried out at 15 K to compare the reaction rate constant between the H and D atoms. The ratio of reaction rate constant k D / k H obtained is about 0.08 at 15 K. The authors provide information on the potential energy for the H + CO reaction at the surface by using the ratio k D / k H and by a model calculation of the potential tunneling with the asymmetric Eckart potential.

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Section: -5mentioning

confidence: 99%

Temperature, composition, and hydrogen isotope effect in the hydrogenation of CO on amorphous ice surface at 10–20K

Hidaka

Kouchi

Watanabe

2007

The Journal of Chemical Physics

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“…Even though the product is a simple diatomic molecule, the H2 formation on a surface is complicated by the participation of various competing reaction pathways, many-body interactions, surface relaxation and surface characteristics, thus offering many challenging problems. 4,[10][11][12][13][14][15][16][17][18][19] Although only two simple atoms and an adatom site are involved in the reaction zone, the actual reaction pathways might be complicated, since H(g) interacts not only with H(ad) but also with many surface sites nearby the adatom site, which are coupled to the adjacent carbon atoms in the surface layers as well as the inner chain atoms and finally to the bulk phase. The effects of many-body interactions make this and related gas-surface reactions radically different from gas-phase reactions.…”

Section: Introductionmentioning

confidence: 99%

Reactions of Gas-Phase Atomic Hydrogen with Chemisorbed Hydrogen on a Graphite Surface

Ree

Kim²,

Shin³

2007

Bulletin of the Korean Chemical Society

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“…Previous attempts to include such processes in a modified rate treatment with large diffusive rates (Herbst 2000;van der Tak et al 2000) suffer from being tested against our former, incorrect Monte Carlo approach. Finally, the rate equations also have the advantage that it is facile to generalize them to incorporate the Eley-Rideal mechanism for surface chemistry, which can be important for surfaces such as graphite where the binding of adsorbates is thought to be strong enough so that no diffusive motion occurs at interstellar temperatures (Farebrother et al 2000).…”

Section: Discussionmentioning

confidence: 99%

Modified rate equations revisited. A corrected treatment for diffusive reactions on grain surfaces

Stantcheva

Caselli

Herbst

2001

A&A

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Abstract.It is well known that the rate equations for diffusive reactions on grain surfaces can be inappropriate under certain circumstances because they do not take the discrete nature of grains into account. A previous modification of the rate equations developed by us to treat surface chemistry on grains more accurately contains an error in the probability of evaporation from grain surfaces. With the rate of evaporation handled correctly, we show for a simple system in which only O and H atoms accrete on grain surfaces and react to form H2, OH, and O2 that the modified rate method is in reasonable agreement with a corrected Monte Carlo approach through 20 K and in excellent agreement with a new master equation approach at 10 K.

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Formation of molecular hydrogen on a graphite surface via an Eley–Rideal mechanism

Cited by 100 publications

References 27 publications

Temperature, composition, and hydrogen isotope effect in the hydrogenation of CO on amorphous ice surface at 10–20K

Temperature, composition, and hydrogen isotope effect in the hydrogenation of CO on amorphous ice surface at 10–20K

Reactions of Gas-Phase Atomic Hydrogen with Chemisorbed Hydrogen on a Graphite Surface

Modified rate equations revisited. A corrected treatment for diffusive reactions on grain surfaces

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