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Temperature Dependence of the Mn 4+ R‐Lines and Vibronic Transitions in MgTiO 3 and Mg 2 TiO 4
Author(s) -
Louat R.,
Louat A.,
Duval E.
Publication year - 1971
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.2220460212
Subject(s) - phonon , vibronic spectroscopy , line (geometry) , lattice (music) , chemistry , spectral line , molecular vibration , fluorescence , vibronic coupling , atomic physics , excitation , thermal , molecular physics , condensed matter physics , physics , excited state , molecule , optics , quantum mechanics , geometry , mathematics , organic chemistry , acoustics , meteorology
The vibrational sidebands observed in the fluorescence spectrum of Mn 4+ incorporated in magnesium titanates are studied. The salient features of the vibronic spectra are the existence of a resonant mode with a „hot line” in MgTiO 3 :Mn 4+ and the presence of very low energy vibrations in Mg 2 TiO 4 :Mn 4+ . The positions of the R 1 fluorescence lines have been measured from 4.2 up to 250 °K. A significant thermal shift is observed and can be interpreted by the presence of linear and quadratic terms in the electron phonon interaction. An effective phonon distribution can be obtained from the vibronic sidebands. The vibrational energy of the lattice is calculated from this distribution and related to the thermal shift.