Affiliation:
1. Department of Chemistry, University of California 1 , Berkeley, California 94720, USA
2. Chemical Sciences Division, Lawrence Berkeley National Laboratory 2 , Berkeley, California 94720, USA
Abstract
The evaporation and scattering of Ne, CD4, and D2O from a dodecane flat liquid jet are investigated in a molecular beam apparatus. The experiment yields translational energy distributions as a function of scattering angle by means of a rotatable mass spectrometer. In the evaporation experiments, one observes a Maxwell–Boltzmann distribution with a cos θ angular distribution superimposed on a weak, isotropic background. The scattering experiments show contributions from impulsive scattering and thermal desorption. At select incident angles for the three systems, angular distributions show super-specular scattering for the impulsive scattering channel, an effect attributed to anisotropic momentum transfer to the liquid surface. The impulsive scattering channel is analyzed with a soft-sphere model to explore energy transfer between the scatterer and liquid as a function of deflection angle. Compared to Ne scattering, the polyatomic gases exhibit more thermal desorption and, in the impulsive scattering channel, a higher degree of internal excitation.
Funder
U.S. Department of Energy
Subject
Physical and Theoretical Chemistry,General Physics and Astronomy
Cited by
5 articles.
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