Abstract
In order to interpret the phosphorescence spectra of NaNO2 and similar single crystals, we performed MCSCF geometry optimization in the ground singlet (X 1 A 1) and in the first excited triplet (a 3 B 1) states of the NO -2 ion and MCSCF quadratic response (QR) calculation of the a 3 B 1–X 1 A 1 transition probability at different bending angles and asymmetric stretch modes. The complete form of the spin–orbit coupling (SOC) operator is accounted for in the QR procedure. Dunning's correlation-consistent polarized valence double-ζ (cc-pVDZ) and triple-ζ (cc-pVTZ) basis sets are imployed. The electric-dipole transition moment from the T z spin sublevel (z is the C 2 axis) oriented along the y direction (the other in-plane axis) is found to be ≃5 times higher than that from the T y sublevel in the ground-state geometry. This is in agreement with polarization measurements and with optical detection of ESR spectra. The T z–S 0 transition moment decreases almost linearly with an increase in the ONO bond angle. The so-called non-Condon effects in the phosphorescence spectra of NaNO2 crystals are explained on these backgrounds. The long progression of the bending vibrations (v 2, a 1) with an anomolous intensity distribution in the T z–S 0 transition and additional involvement of the asymmetric stretch mode (v 3, b 2) in the T y–S 0 transition are interpreted by force field and SOC calculations in the MCSCF-response technique. Configuration interaction (CI) calculations of the spin-allowed electric dipole transitions in NO -2 ions with effective one-electron SOC operator matrix element estimations were done for comparison with the results of the quadratic and linear response methods. Other T n–S 0 transitions are also studied. Finally, a short discussion of nonradiative processes is presented.
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Minaev, B.F., Minaeva, V.A. Ab Initio Study of the Phosphorescence of Nitrite Ions. Journal of Fluorescence 9, 221–232 (1999). https://doi.org/10.1023/A:1022559717888
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DOI: https://doi.org/10.1023/A:1022559717888