Evaporation and scattering of neon, methane, and water from a dodecane flat liquid jet

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...

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Bibliographic Details
Published in:The Journal of chemical physics 2023-08, Vol.159 (5)
Main Authors: Yang, Walt, Lee, Chin, Saric, Steven, Pohl, Marvin N., Neumark, Daniel M.
Format: Article
Language:English
Subjects:
Angular distribution
Boltzmann distribution
Desorption
Dodecane
Energy transfer
Evaporation
INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Liquid surfaces
Molecular beams
Momentum transfer
Neon
Polyatomic gases
Scattering angle
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Summary: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.
ISSN:0021-9606
1089-7690
DOI:10.1063/5.0159796