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Optical Properties of CrO 4 2− Ion in Orthorhombic Sulphates
Author(s) -
Radhakrishna S.,
Pande K. P.
Publication year - 1973
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.2220550115
Subject(s) - orthorhombic crystal system , excited state , ground state , ion , degenerate energy levels , absorption spectroscopy , atomic physics , infrared spectroscopy , infrared , spectral line , atomic electron transition , electronic structure , absorption (acoustics) , hot band , chemistry , molecular vibration , molecular physics , materials science , molecule , physics , crystallography , crystal structure , optics , computational chemistry , organic chemistry , quantum mechanics , astronomy , composite material
Vibrational frequencies of CrO 4 2−ion embedded in orthorhombic sulphates have been determined from optical and infrared absorption studies. In the optical absorption spectra, the electronic levels are found to have a superposed vibration structure, in the regions 2300 to 2750 Á and 3300 to 3850 Á, with alternate strong and weak lines. The set of strong lines is interpreted to be due to the transitions from the ground electronic state to the vibrational levels of the excited state, whereas the set of weaker lines is assigned to the transitions from one of the vibrational levels of the ground electronic state to the vibrational levels of the upper excited electronic state. It is found that the IR forbidden bands become allowed and are observed in these lattices. No splitting is observed in the degenerate modes in IR spectra.