Abstract
The far-infrared optical absorption spectrum of methane diluted in condensed xenon has been measured at 6 K. For CH 4 –Xe and for CD 4 –Xe systems, distinct peaks have been observed at 47.6 cm -1 and 21.8 cm -1 , respectively. The peaks have been attributed to the excitation of the rotational transitions between specific levels of the methane molecule. The peak energies are in fairly good agreement with theoretically calculated values of the hindered rotator by Nishiyama and Yamamoto.
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