The anisotropy of the intensity of the optical absorption in β′-Tb2(MoO4)3

Autor:	J. Zeman, V. D. Negrii, A. G. M. Jansen, Gerard Martinez, Redkin Boris S, A. K. Zvezdin, B. K. Ponomarev, P. Wyder
Rok vydání:	1997
Předmět:	Crystal Materials science Extended X-ray absorption fine structure Excited state Orthorhombic crystal system Atomic physics Condensed Matter Physics Anisotropy Absorption (electromagnetic radiation) Ferroelectricity Two-photon absorption Electronic Optical and Magnetic Materials
Zdroj:	Ferroelectrics. 204:279-288
ISSN:	1563-5112 0015-0193
DOI:	10.1080/00150199708222208
Popis:	Optical absorption spectra were measured in polarized light in a metastable orthorhombic ferroelectric β′-phase of Tb2(MoO4)3 at 7 K. Measurements were made at four directions of the wave vector k along the crystal axes [100], [110], [010] and [001]. For all these directions of κ the measurements were performed at two mutually perpendicular directions of the electric vector of light e along the principal crystal axes perpendicular to k. 14 absorption peaks were observed with the wave numbers from 20520 cm−1 to 20655 cm−1. They correspond to the dipole-forbidden transitions 7F6-5D4 in Tb3+ -ions. A strong anisotropy of the absorption was observed. Using the anisotropy of the absorption it was shown, that the main contributions to the intensities of the observed absorption peaks were due to the electric-quadrupole transitions to the excited states of Г1-symmetry.
Databáze:	OpenAIRE
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