Abstract
AbstractThe simple model introduced in part I of this work, allowing for a theoretical investigation of symmetry‐forbidden vibronic absorption bands of molecular crystals, is extended in order to include the possibility of a frequency change of the non‐totally symmetric vibration which couples two molecular states with help of the Herzberg‐Teller mechanism. A formula for the absorption coefficient in the zero‐phonon approximation is derived and discussed. One‐ and two‐phonon regions of the spectrum are investigated.
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