Experimental evidence of enhanced diffuse monomer scattering in cluster-surface collisions. Arn on graphite
✍ Scribed by M. Benslimane; M. Châtelet; A. De Martino; F. Pradère; H. Vach
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 451 KB
- Volume
- 237
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
We report the first experimental observation of diffuse scattering of monomers exhibiting significant velocity thermalization in large argon clusters collisions with a pyrolytic surface. Angular distributions of the outcoming argon atoms show a diffuse component for which time-of-flight spectra are independent of incidence angle and incoming cluster size, while they vary significantly with surface temperature. The amplitude of the diffuse scattering component is enhanced by up to a factor of three for incident dusters over its value for incident monomers. This enhancement is discussed by using a simple model of atom trapping-desorption on fiat surfaces.