Abstract
Absorption coefficient and refractive index were measured for methyl fluoride in the frequency range 70-320 GHz and for temperatures ranging from the melting point to the triple point. The present results in combination with previous spectroscopic data give the complete 0-THz dipolar spectrum. The experimental results are well described by the confined rotator model with the exception of the part of the spectrum around 600 GHz where an additional absorption band is observed. The general features of this extra absorption are discussed in the framework of several molecular dynamics mechanisms, and show qualitative agreement with the contribution from induced moments originating in translational motion.
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