Translational-rotational interaction in dynamics and thermodynamics of 2D atomic crystal with molecular impurity

• Published in: Физика низких температур
• Date: 2003
• Main Authors: Antsygina, T.N., Poltavskaya, M.I., Chishko, K.A.
• Format: Article
• Language: English
• Published: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2003
• Subjects: Physics in Quantum Crystals
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/128916
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Translational-rotational interaction in dynamics and thermodynamics of 2D atomic crystal with molecular impurity / T.N. Antsygina, M.I. Poltavskaya, K.A. Chishko // Физика низких температур. — 2003. — Т. 29, № 9-10. — С. 961-966. — Бібліогр.: 12 назв. — англ.

The interaction between the rotational degrees of freedom of a diatomic molecular impurity and the phonon excitations of a two-dimensional atomic matrix commensurate with a substrate is investigated theoretically. It is shown, that the translational-rotational interaction changes the form of the rotational kinetic energy operator as compared to the corresponding expression for a free rotator, and also renormalizes the parameters of the crystal field without change in its initial form. The contribution of the impurity rotational degrees of freedom to the low-temperature heat capacity for a dilute solution of diatomic molecules in an atomic two-dimensional matrix is calculated. The possibility of experimental observation of the effects obtained is discussed.