Hindered rotation of CO molecules in a solid Kr matrix. Specific heat
V. V. SumarokovPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovYu. A. FreĭmanPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovV. G. Manzheliı̆Physicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovV. A. PopovPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, KharkovV. A. KonstantinovPhysicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov
ABI
Abstract
The specific heat of a Kr−CO solid solution with a carbon monoxide concentration of 0.95 mol.% has been studied in the temperature range 2−12 K. In order that the experimental and calculated results should agree it is necessary to assume an appreciable renormalization of the effective rotational constant B/Beff≈2.5. It was found that the barrier hindering rotation of CO molecules in a Kr matrix is ∽10B≈27.5 K. The existence of a low-temperature peak in the specific heat with a maximum in the region of T∽0.3 − 0.4 K is predicted.
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