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  4. State-resolved gas-surface reactivity of methane in the symmetric C-H stretch vibration on Ni(100)
 
research article

State-resolved gas-surface reactivity of methane in the symmetric C-H stretch vibration on Ni(100)

Maroni, Plinio  
•
Papageorgopoulos, Dimitrios C  
•
Sacchi, Marco  
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2005
Physical Review Letters

The state-resolved reactivity of CH4 in its totally symmetric C-H stretch vibration (nu(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 nu(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 (nu(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 nu(3)). The difference between the state-resolved reactivity for nu(1) and nu(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.

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Type
research article
DOI
10.1103/PhysRevLett.94.246104
Web of Science ID

WOS:000230092000040

Author(s)
Maroni, Plinio  
Papageorgopoulos, Dimitrios C  
Sacchi, Marco  
Dang, Tung T  
Beck, Rainer D  
Rizzo, Thomas R  
Date Issued

2005

Published in
Physical Review Letters
Volume

94

Issue

24

Article Number

246104

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LCPM  
Available on Infoscience
December 15, 2005
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/221365
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