Dissociative electron attachment on surfaces and in bulk media

Journal Article · Sun Jul 15 04:00:00 EDT 2007 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.76.012902· OSTI ID:21011243

Fabrikant, Ilya I ^[1]

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1. Department of Physics and Astronomy, University of Nebraska, Lincoln, Nebraska 68588-0111 (United States)

A theory of dissociative electron attachment to molecules condensed at surfaces and embedded within bulk media is developed. The theory of low-energy electron diffraction is used to obtain the width for electron-molecule resonance scattering in the condensed phase from the width for the gas phase. It is then employed for the calculation of dissociative attachment in the framework of the nonlocal complex potential theory. Specific calculations using the effective mass approximation are carried out for electron attachment to CH{sub 3}Cl and CF{sub 3}Cl molecules physisorbed on the surface of a Kr film. The role of image states and image-potential resonances is analyzed. The results show an increase by several orders of magnitude in the cross section for physisorbed molecules as compared with gas-phase molecules. This is in general agreement with the measured cross sections. However, the position of the peak in the cross section for CH{sub 3}Cl is significantly shifted towards higher energies as compared to experiment [K. Nagesha et al., J. Chem. Phys. 114, 4934 (2001)], and the magnitude of the calculated cross section for CF{sub 3}Cl at the surface is significantly higher than the measured value. Possible reasons for disagreements are analyzed.

• OSTI ID: 21011243
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 1 Vol. 76; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ADSORPTION
APPROXIMATIONS
CARBON COMPOUNDS
CHLORINE COMPOUNDS
CROSS SECTIONS
EFFECTIVE MASS
ELECTRON ATTACHMENT
ELECTRON DIFFRACTION
ELECTRON-MOLECULE COLLISIONS
ELECTRONS
FILMS
FLUORINE COMPOUNDS
HYDROGEN COMPOUNDS
KRYPTON
METHYL CHLORIDE
MOLECULES
RESCATTERING
RESONANCE
RESONANCE SCATTERING
SURFACES