Open AccessKinetics of Thermal Excitation of a Molecule in a Condensed Medium
Author(s) -
V. I. Teslenko,
D. Y. Iatsenko
Publication year - 2022
Publication title -
ukrainian journal of physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.213
H-Index - 17
eISSN - 2071-0194
pISSN - 2071-0186
DOI - 10.15407/ujpe56.7.714
Subject(s) - excitation , adiabatic process , limiting , thermal , molecule , master equation , ground state , physics , thermodynamics , thermal equilibrium , atomic physics , quantum , rate equation , kinetics , materials science , condensed matter physics , quantum mechanics , mechanical engineering , engineering
A microscopic model of thermal excitation of the vibrational ground state of a molecule interacting with a condensed medium is developed. The master equation for the evolution of occupancies of vibrational levels is derived. The rate constant limiting the process of molecular thermal excitation is determined analytically. It is shown that while this quantity is independent of the temperature at low temperatures, by coinciding with a rate speed limit for quantum transitions due to the uncertainty principle, it rises rather linearly with the temperature at high temperatures according to the Einstein's relation for adiabatic transitions.