Abstract
The structure of monolayer CH 2D 2 adsorbed on NaCl(100) is explored through the photometry of the polarized infrared spectra. A previous study of CH 4 on NaCl(100) was unable to distinguish between two methane conformations within the monolayer. One conformation is the tripod with three hydrogens against the surface and one pointing away. The dipod conformation has two hydrogens down and two hydrogens up. Since several distinct molecular orientations can bond to the NaCl surface simultaneously within each conformation, a theoretical model is developed to account for these geometric permutations in the monolayer. The polarized spectroscopic data are presented along with the theoretical model. An analysis of the data and the proposed model conclusively establishes a tripod conformation of the monolayer methane molecules over the NaCl(100) surface.
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