Abstract
The effect of vibronic coupling (orbit–lattice interaction), which produces a mixing between the low-lying electronic states with the emission and absorption of phonons of varying energies, is considered to explain the observed temperature dependence of Mössbauer quadrupole splitting of Fe2+ ions in CsCoCl3 over 22 to 300 K. The various lattice dynamical parameters are estimated and then quadrupole splitting is explicitly calculated as a function of temperature. One obtains a reasonably good agreement with the experimental data, which shows that the vibrating lattice model is quite realistic and important.
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