Premium
Rotational Structure of Vibronic Absorption and Luminescence Spectra of NO − 2 Impurity Molecules in Potassium Halide Crystals
Author(s) -
Avarmaa R.,
Rebane L.
Publication year - 1969
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19690350108
Subject(s) - excited state , chemistry , absorption spectroscopy , relaxation (psychology) , spectral line , absorption (acoustics) , atomic physics , ion , halide , ground state , luminescence , impurity , liquid helium , molecular physics , molecule , helium , materials science , inorganic chemistry , physics , psychology , social psychology , optoelectronics , organic chemistry , quantum mechanics , astronomy , composite material
Abstract The rotational structure of the pure‐electronic (near 4000 Å) and other zero‐phonon lines associated with v 1 and v 2 modes is observed in the vibronic spectra of NO − 2ions in KCl and KBr crystals at liquid helium temperature. Three components in the (0, 0) group of the absorption spectrum of KCl‐NO − 2have the intervals 7 and 10 cm −1 , the resonant (0, 0) group in emission consists of two components. In the KBr host some components show additional splitting. The rotation of NO − 2in KCl about the top axis a is found to be somewhat hindered in the ground state and nearly free in the excited electronic state. Some emission occurs from thermal nonequilibrium rotational states which gives evidence for rather slow rotation‐phonon relaxation. Several groups of the absorption spectra exhibit rotational perturbations which are suggested to be caused by Coriolis interaction between the vibrations v ′ 1 (A 1 ) and v ′ 3 (B 1 ).