A lowhyphen;temperature cell employing barium fluoride windows and indium metal gaskets has been built and is being used for the study of rotational, vibrational, and electronic motions of molecules in liquid rare gases. The ngr;3fundamental of CH4in liquid argon shows a single, relatively sharpQbranch. ThePandRbranches are probably present but apparently are lost in the wings of theQbranch. The infrared spectrum near 3.5 mgr; of HCl in liquid xenon shows wellhyphen;resolvedP, Q,andRbranches, but the individual rotational lines are not resolved. TheObranch is not resolved from the tail of thePbranch, but there is some indication of theSbranch on the highhyphen;frequency side of the spectrum. TheQbranch is shifted 36 cmmdash;1to the lowhyphen;frequency side of its gashyphen;phase position. The appearance ofO, Q,andSbranches is expected because of the presence of an induced dipole moment through the polarizability of the solvent. The agreement between the observed spectrum and that anticipated on the basis of nearly free rotation gives good evidence for the existence of quantized rotational motions of HCl in liquid xenon.
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