Open AccessTHE VIBRATION-QUENCHING OF THE EXCITON AND THE HUANG-RHYS FACTOR IN THE QUASI ONE-DIMENSIONAL ANTIFERROMAGNET CMC
Author(s) -
Wei Jia,
Wenmin Yan
Publication year - 1983
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.32.346
Subject(s) - radiative transfer , exciton , phonon , physics , condensed matter physics , quenching (fluorescence) , intensity (physics) , antiferromagnetism , vibration , atomic physics , coupling (piping) , materials science , quantum mechanics , fluorescence , metallurgy
The exciton transition 4T1→6A1 of Mn2+ ions in quasi one-dimensional antiferro-magnet CsMnCl3·2H2O is very weak in intensity with a shorter lifetime due to the vibration-queching. Replacing H2O by D2O), three important effects have been observed: the exciton line is shifted to the red by 18cm-1, the intensity of the exciton is increased by almost one order, the lifetime is lengthened from 0.58 ms to 9.2 ms. These facts show that the vibration-quenching has been weakened. The experimental results are analysed by means of the theory of multi-phonon radiative and non-radiative transitions. It has been shown that the isotope substitution changes the spectrum of lattice vibration, and brings forth a great influence on the non-radiative transition. The electronphonon coupling intensity does not show any obvious change, and the Huang-Rhys factor remains constant. The phonon modes involved in the multi-phonon radiative transition are different from those involved in the multi-phonon nonradiative process, their average energies are quite different from each other.