Solvatochromic shift of the 0-0 phosphorescence band and change of polarizability in the a 1δg → X 3Σ g? -transition in the oxygen molecule |
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Authors: | V S Pavlovich |
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Institution: | (1) Institute of Molecular and Atomic Physics, National Academy of Sciences of Belarus, 70 Nezavisimosti Ave., Minsk, 220072, Belarus |
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Abstract: | We used known experimental data to analyze the influence of intermolecular interactions on the position of the 0-0-band a1Δg → X3Σ
g
−
phosphorescence of molecular oxygen in solutions. A bathochromic (red) shift caused by dispersion interactions and fluctuations
of the internal electric field (induction effect) is analyzed employing new formulas obtained by us in the framework of the
Onsager model. The contributions from intermolecular repulsion and higher multipole interactions to the shift of the spectrum
are also discussed. It is found that the polarizability in the a1Δg state is higher than in the X3Σ
g
t-
state by 0.19 ± 0.03 Å3. Taking into account the induced nature of O2 phosphorescence in solutions, it is noted that the change of polarizability Δαeg = 0.19 Å3 should differ from the change of Δαeg inherent in free molecular oxygen.
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 74, No. 4, pp. 453–459, July–August, 2007. |
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Keywords: | intermolecular repulsion dispersion and induction interactions quadrupole-quadrupole interactions solvatochromic shift phosphorescence polarizability singlet oxygen |
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