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Angular and Energy Distributions of RH Atoms Desorbed in an Excited State from Ion-Bombarded Rh{100}

Published online by Cambridge University Press:  26 February 2011

Roya Maboudian ,
M. El-Maazawi ,
Z. Postawa  and
N. Winograd
Roya Maboudian
Affiliation:
Department of Chemistry, The Pennsylvania State University, University Park, PA 16802
M. El-Maazawi
Affiliation:
Department of Chemistry, The Pennsylvania State University, University Park, PA 16802
Z. Postawa
Affiliation:
Department of Chemistry, The Pennsylvania State University, University Park, PA 16802
N. Winograd
Affiliation:
Department of Chemistry, The Pennsylvania State University, University Park, PA 16802
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Abstract

Multiphoton resonance ionization spectroscopy has been used to determine the polar-angle and the kinetic-energy distributions of rhodium atoms desorbed from ion-bombarded Rh{100} surface in the fine-structure components of the a 4Fj (J=9/2 and 7/2) ground-state multiplet. The peak in the energy distribution of the metastable level (4F7/2 with excitation energy of 0.2 eV) is found to occur roughly at the same value as the ground-state (4F9/2) distribution but decays more gradually at higher energies. The measured spectra have been used to investigate the dependence of the excitation probability on the takeoff angle (θ) as well as the emission velocity (v). It is shown that the excitation probability depends strongly on these parameters, approaching an exponential dependence on l/[v cos(θ)] at higher velocities (> 5×l05cm/sec).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 201: Symposium A – Surface Chemistry and Beam-Solid Interactions , 1990 , 87
Copyright
Copyright © Materials Research Society 1991

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