Experimental Study on Paired Ag^- Ions in KCl

概要

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New absorption bands have been observed in the spectra of single crystals of KCl:Ag^- irradiated with the C band light (287 nm) at room temperature. Some of the absorption bands are attributed to the same center (named X in this paper) since irradiation with light at these absorption bands gives rise to an identical luminescence at 678 nm. The positions of the observed absorption bands of the X center are 330 nm (X_1), 283 nm (X_2) and 278 nm (X_3) at liquid nitrogen temperature. In addition to these bands, six other absorption bands belonging to the X center have been found from the excitation spectra of the luminenscence, namely, 267 nm (X_4), 263 nm (X_5), 228 nm (X_6), 435 nm (Y_1), 403 nm (Y_2) and 390 nm (Y_3). The 678 nm emission shows a noticiable polarization correlation with the exciting light. From the studies of the azimuthal dependence of polarized luminescene and a theoretical consideration by use of molecular orbitals, the X center is identified with the paired Ag-ions orientated along <110> directions of the crystals.
社団法人日本物理学会の論文
1972-02-05