Premium
Experimental Observations of the Absorption, Infra‐Red Emission, and Excitation Spectra of Cr 3+ Ions in ZnWO 4
Author(s) -
Reynolds M. L.,
Hagston W. E.,
Garlick G. F. J.
Publication year - 1968
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.19680300114
Subject(s) - excited state , ion , tetragonal crystal system , excitation , atomic physics , emission spectrum , tungstate , chemistry , absorption spectroscopy , spectral line , materials science , crystal structure , physics , optics , inorganic chemistry , crystallography , organic chemistry , quantum mechanics , astronomy
Optical absorption, infra‐red emission, and excitation spectra have been measured for trivalent chromium ions in the zinc tungstate lattice. In contrast to the case of ruby the lowest excited state is 4 T 2 (F) and emission results from the 4 T 2 − 4 A 2 transition. The emission at about 1 μm is of broad band type with a decay time of about 10 −5 s and involves a significant Stokes shift. These characteristics are consistent with the strong dependence of the energy of the 4 T 2 state on the crystal field parameter, and a large activator‐lattice interaction. Rhombic symmetry is indicated for the Cr 3+ ion site, but tetragonal distortion occurs for the excited states.