Elastic scattering

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Hi guys:

Under a large glancing angle, when the impinging molecules with a certain kinetic energy impact on an armophors surface, a certain amount of molecules can be scattered away from surface instead of sticking on the surface. So, people suggest that the surface phonons play a role to assist the molecule - surface scattering, for instance when the experiments are carried at RT. However, if cooling down the surface to a certain temperature for intentionally killing the surface phonons, we are still able to see the phenomenon of molecular back scattering when the molecular beam impinging anle is large. What could be the mechanism to explain this? Is it due to the enhanced elastic scattering once the surface phonons are deactivated?

Thank you

Sinayu71
 

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