Open AccessРелаксация колебательно-возбужденных состояний в твердых бинарных системах карбонат--сульфат
Author(s) -
А.Р. Алиев,
И.Р. Ахмедов,
М.Г. Какагасанов,
З.А. Алиев,
М.М. Гафуров,
К.Ш. Рабаданов,
А.М. Амиров
Publication year - 2018
Publication title -
fizika tverdogo tela
Language(s) - English
Resource type - Journals
eISSN - 1726-7498
pISSN - 0367-3294
DOI - 10.21883/ftt.2018.02.45390.140
Subject(s) - raman spectroscopy , phonon , excited state , ion , relaxation (psychology) , excitation , carbonate , lattice vibration , lattice (music) , chemistry , vibration , materials science , atomic physics , condensed matter physics , physics , optics , organic chemistry , quantum mechanics , psychology , social psychology , acoustics
The processes of molecular relaxation in solid binary carbonate-sulfate systems, such as Li_2CO_3-Li_2SO_4, Na_2CO_3-Na_2SO_4, K_2CO_3-K_2SO_4, have been studied by Raman spectroscopy. It has been revealed that the relaxation time of CO _3 ^2- anion vibration ν_1(A) in a binary system is higher than in an individual carbonate. It is shown that an increase in the relaxation rate may be explained by the existence of an additional mechanism of the relaxation of vibrationally excited states of a carbonate anion. This mechanism is associated with the excitation of the vibration of another anion (SO _4 ^2- ) and the “birth” of a lattice phonon. It has been established that the condition for the implementation of such a relaxation mechanism is that the difference between the frequencies of these vibrations must correspond to the region of a rather high density of phonon spectrum states.