State-resolved gas-surface reactivity of methane in the symmetric C-H stretch vibration on Ni(100)Maroni, P., Papageorgopoulos, D. C., Sacchi, M., Dang, T. T., Beck, R. D. and Rizzo, T. R. (2005) State-resolved gas-surface reactivity of methane in the symmetric C-H stretch vibration on Ni(100). Physical Review Letters, 94 (24). 246104. ISSN 0031-9007 Full text not archived in this repository. It is advisable to refer to the publisher's version if you intend to cite from this work. See Guidance on citing. To link to this item DOI: 10.1103/PhysRevLett.94.246104 Abstract/SummaryThe state-resolved reactivity of CH4 in its totally symmetric C-H stretch vibration (�1) has been measured on a Ni(100) surface. Methane molecules were accelerated to kinetic energies of 49 and 63:5 kJ=mol in a molecular beam and vibrationally excited to �1 by stimulated Raman pumping before surface impact at normal incidence. The reactivity of the symmetric-stretch excited CH4 is about an order of magnitude higher than that of methane excited to the antisymmetric stretch (�3) reported by Juurlink et al. [Phys. Rev. Lett. 83, 868 (1999)] and is similar to that we have previously observed for the excitation of the first overtone (2�3). The difference between the state-resolved reactivity for �1 and �3 is consistent with predictions of a vibrationally adiabatic model of the methane reaction dynamics and indicates that statistical models cannot correctly describe the chemisorption of CH4 on nickel.
Altmetric Deposit Details University Staff: Request a correction | Centaur Editors: Update this record |