Phonon Side Bands of the Triplet Absorption in NaNO<SUB>2</SUB>

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  • Kamada Masao
    Department of Physics, Faculty of Science, Kyoto University
  • Kato Riso
    Department of Physics, Faculty of Science, Kyoto University

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  • Phonon Side Bands of the Triplet Absorption in NaNo2
  • Phonon Side Bands of the Triplet Absorp

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Absorption spectra of NaNO2 associated with the electronic transition 1A1→3B1 in NO2− have been measured for the E⁄⁄a, b and c polarizations. The E⁄⁄b and E⁄⁄c spectra show the series of vibronic lines accompanied with the phonon side bands, while the E⁄⁄a absorption is too weak to be observed. The selection rules are discussed for the modes of phonons which interact with the triplet exciton to give rise to the phonon side band of each polarization. The assignments are given to the prominent peaks and shoulders in the side bands of the E⁄⁄b and E⁄⁄c spectra. Two extra series of weak satellite bands have been found on the low energy tails of the vibronic lines and they are interpreted as the lines due to the isotopic species N14O16O18− and N15O216−.

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