Study of vibronic interactions in impurity centers by conjugate fluorescence and absorption spectra with a poorly resolved vibrational structure |
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Authors: | N L Naumova I A Vasil’eva I S Osad’ko A V Naumov |
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Institution: | (1) Moscow State Pedagogical University, Moscow, 119992, Russia;(2) Lebedev Institute of Physics, Russian Academy of Sciences, Moscow, 119991, Russia;(3) Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow oblast, 142190, Russia |
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Abstract: | The conjugate fluorescence and fluorescence excitation spectra of recently synthesized substituted arylpolyene (C6H5-CH=CH]2-C6H4-NH2) are studied in solid n-octane at a temperature of 4.2 K. The spectra exhibit a weakly pronounced vibrational structure. A method of determination of the vibronic interaction parameters responsible for the shape of the spectra is developed. The method is based on the modeling of the spectra by series of vibronic bands, each of which consists of a narrow zero-phonon line and a broad phonon wing (phonon sideband). This makes it possible to calculate the fluorescence and fluorescence excitation spectra with the weakly pronounced vibrational structure and compare them with the measured spectra. The deviations from the mirror symmetry between the measured fluorescence and fluorescence excitation conjugate spectra are explained by the combined effect of the Franck-Condon and Herzberg-Teller interactions. The parameters of these interactions are determined. |
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