Dichroic Optical Absorptions and Thermal Reorientation of Jahn-Teller Distorted Ag^<2+> Centers in CdCl_2
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概要
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Photon-induced dichroism and its isothermal decay of $\gamma$-irradiated CdCl2:AgCl are investigated in the range of 1.8–25 K. Conventional measurements of anisotropic absorption spectra reveal that at least two bands peaking at 395 and 540 nm are attributed to Ag2+ centers distorted tetragonally by the Jahn-Teller effect. Time-dependent detections and analysis of the dichroism under excitation with polarized light allow to determine the ratio $f({\equiv}\sigma_{\perp}/\sigma_{//})$ of dipole strengths parallel and perpendicular to the distortion axis, yielding $f{\simeq}5.9\pm 0.5$ and $7.1\pm 0.5$ for the 395 and 540 nm bands, respectively. The rate of thermal reorientation of the distortions among three equivalent configurations is found to be expressed by $w(T){=}\nu_{0}\exp(-E/kT)$ with the values $E{\simeq}250$ cm-1 and $\nu_{0}{\simeq}2\times 10^{5}$ sec-1.
- 社団法人日本物理学会の論文
- 1975-05-15
著者
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Kanno K
Department Of Material Science And Chemistry Wakayamna University
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Nakai Yoshio
Department Of Physics Faculty Of Scicncc Kyoto University
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Kan′no Ken-ichi
Department of Material Science and Chemistry, Wakayamna University
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