AVS 46th International Symposium
    Surface Science Division Wednesday Sessions
       Session SS-WeP

Paper SS-WeP38
Energy Transfer in Collisions of Nitric Oxide with Ordered Molecular Adlayers

Wednesday, October 27, 1999, 5:30 pm, Room 4C

Session: Poster Session
Presenter: M.R.S. McCoustra, University of Nottingham, UK
Authors: M.K. Ainsworth, University of Nottingham, UK
V. Fiorin, University of Nottingham, UK
M.R.S. McCoustra, University of Nottingham, UK
M.A. Chesters, University of Nottingham, UK
Correspondent: Click to Email
Detailed dynamical measurements have been made of the scattering of nitric oxide from well-characterised and well-ordered monolayers of carbon monoxide (CO) and ethylidyne (CCH@sub 3@) adsorbed on a Pt(111). The scattering dynamics have been probed using a combination of molecular beam and laser spectroscopic techniques for incident NO translational energies in the range 5 to 50 kJ mol@super -1@ at substrate surface temperatures from 100 to 300 K. Time-of-flight measurements were used to determine the translational energy of the scattered NO, while resonance-enhanced multiphoton ionisation was used to recover its rotational quantum state distributions. The results of both types of experiment will be reported. Significant loss of incident NO translational energy is observed and evidence from these measurements suggests that scattering occurs into both a direct inelastic scattering channel and a trapping-desorption channel. The scattering dynamics from both adlayers are found to be similar, with only slight differences that may be interpreted in terms of different interaction potential strengths.