On the role of vibrational energy in the activated dissociative chemisorption of methane on tungsten and rhodium
- 15 April 1986
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 84 (8), 4163-4167
- https://doi.org/10.1063/1.450035
Abstract
The vibrational energy dependence of the dissociative chemisorption probability of CH4 on W(110) is investigated with the use of a seeded supersonic molecular beam. By variation of the beam source temperature and seed gas mixture the degree of vibrational excitation of the incident CH4 molecules can be varied while the incident kinetic energy is held constant. The results are consistent with a model in which all vibrational modes are equally effective and vibrational energy and translational energy are approximately equivalent in promoting this highly activated process. Previous unsuccessful attempts to promote CH4 chemisorption on rhodium via vibrational excitation are consistent with our findings; we are also able to account for previous observations of enhancement of dissociative chemisorption in heated effusive beam experiments.Keywords
This publication has 15 references indexed in Scilit:
- Charge transfer, vibrational excitation, and dissociative adsorption in molecule–surface collisions: Classical trajectory theoryThe Journal of Chemical Physics, 1985
- On the dissociation of diatomic molecules at metal surfacesChemical Physics Letters, 1985
- Molecular beam studies of the dynamics of activated adsorption of N2 on W(110): Dissociation threshold and new binding statesSurface Science, 1984
- Vibrational excitation and surface reactivity: An examination of the ν3 and 2ν3 modes of CH4The Journal of Chemical Physics, 1979
- The kinetic isotope effect in the dissociative chemisorption of methaneThe Journal of Chemical Physics, 1976
- Dynamics of activated chemisorption: Methane on rhodiumThe Journal of Chemical Physics, 1975
- The activated, dissociative chemisorption of methane on tungstenThe Journal of Chemical Physics, 1975
- Molecular beam study of the apparent activation barrier associated with adsorption and desorption of hydrogen on copperSurface Science, 1974
- Molecular beam investigation of adsorption kinetics on bulk metal targets: Nitrogen on tungstenSurface Science, 1972
- Rotational Temperature in an Underexpanded JetPhysics of Fluids, 1971