Abstract
The excitation energy dependence of the peak energy of the 0-0 luminescence band of β-carotene in isopentane has been measured at various temperatures. It is analyzed using the two-dimensional configuration coordinate model. Assuming that the nature of the intermediate state interaction for a second-order optical process in this system is in slow modulation, we calculate the amplitude of the energy modulation using the value of the observed Stokes shift and compare it to that derived from the analysis of the excitation profiles of Raman scattering and luminescence. They are in good agreement with each other, which indicates that the observed energy shift of the luminescence and the excitation profiles of second-order optical processes can be understood by the stochastic motion on the adiabatic potential curves.
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