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. In conclusion, compared to Ne scattering, the polyatomic gases exhibit more thermal desorption and, in the impulsive scattering channel, a higher degree of internal excitation.
Yang, Walt, et al. "Evaporation and scattering of neon, methane, and water from a dodecane flat liquid jet." Journal of Chemical Physics, vol. 159, no. 5, Aug. 2023. https://doi.org/10.1063/5.0159796
Yang, Walt, Lee, Chin, Saric, Steven, Pohl, Marvin N., & Neumark, Daniel M. (2023). Evaporation and scattering of neon, methane, and water from a dodecane flat liquid jet. Journal of Chemical Physics, 159(5). https://doi.org/10.1063/5.0159796
Yang, Walt, Lee, Chin, Saric, Steven, et al., "Evaporation and scattering of neon, methane, and water from a dodecane flat liquid jet," Journal of Chemical Physics 159, no. 5 (2023), https://doi.org/10.1063/5.0159796
@article{osti_2294052,
author = {Yang, Walt and Lee, Chin and Saric, Steven and Pohl, Marvin N. and Neumark, Daniel M.},
title = {Evaporation and scattering of neon, methane, and water from a dodecane flat liquid jet},
annote = {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. In conclusion, compared to Ne scattering, the polyatomic gases exhibit more thermal desorption and, in the impulsive scattering channel, a higher degree of internal excitation.},
doi = {10.1063/5.0159796},
url = {https://www.osti.gov/biblio/2294052},
journal = {Journal of Chemical Physics},
issn = {ISSN 0021-9606},
number = {5},
volume = {159},
place = {United States},
publisher = {American Institute of Physics (AIP)},
year = {2023},
month = {08}}