Molecular beam studies of the interaction of nitrogen molecules with the Fe(111) surface
Thesis/Dissertation
·
OSTI ID:6367304
The interaction of nitrogen with the Fe(111) surface has been investigated by molecular beam scattering techniques. The rotational energy and angular distributions of a pulsed, supersonic beam of nitrogen molecules scattered from this surface have been measured using the electron beam induced fluorescence technique. The molecules in the incident beam are characterized by a rotational temperature of 19/sup 0/K and have a near monoenergetic translational energy distribution (..delta..v/v approx. = 5%). The rotational energy of molecules scattered into the specular angle, for 45/sup 0/ incidence varied between 150/sup 0/ and 250/sup 0/ K as the incident translational energy was increased from 90 meV to 340 meV, and was essentially independent of surface temperature between T/sub s/ = 400/sup 0/K and 700/sup 0/K. This indicates that direct inelastic scattering events are dominant in the specular exit channel. The mean rotational energy of scattered molecules was found to increase as the exit angle approached the surface normal. This dependence is completely opposite to the results expected for a laterally smooth, impulsive interaction potential as has been postulated for the NO/Ag(111) system. A corrugated hard wall interaction potential similar to Goodman's hard-sphere model, is qualitatively consistent with the present data for N/sub 2//Fe(111). Further evidence for a highly corrugated interaction potential was found in the angular distributions of scattered nitrogen molecules. At an incident energy of 200 MeV and theta/sub i/ = 45/sup 0/ the angular distribution peaks at 70/sup 0/, 25 degrees of specular.
- Research Organization:
- Princeton Univ., NJ (USA)
- OSTI ID:
- 6367304
- Country of Publication:
- United States
- Language:
- English
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