Data are presented on the optical absorption and emission of F-aggregate centers in NaCl:OH-. In particular, we have studied the properties of the laser-active (F2+)H centers. The formation of the (F2+)H center is temperature dependent. One mechanism operates below and another above 50 K. The bleaching of the (F2+)H-center emission observed under intense Nd:YAG or He-Ne laser irradiation, due to reorientation of the emitting centers, is accompanied by a process at low temperatures that is predominant at temperatures below 20 K and involves the ionization of the X or F3 centers always present in the crystal. Thus the laser-active (F2+)H centers are destroyed by electron capture but are reformed by F-band light irradiation, which reverses the bleaching process. © 1991 The American Physical Society.
Baldacchini, G., Cremona, M., Casalboni, M., de Viry, D., Grassano, U.m., Luci, A., et al. (1991). Optical properties of (F2+)H and F-aggregate centers in NaCl:OH- crystals. PHYSICAL REVIEW. B, CONDENSED MATTER, 44(22), 12189-12196 [10.1103/PhysRevB.44.12189].
Optical properties of (F2+)H and F-aggregate centers in NaCl:OH- crystals
CASALBONI, MAURO;GRASSANO, UMBERTO MARIA;PALUMMO, MAURIZIA;
1991-01-01
Abstract
Data are presented on the optical absorption and emission of F-aggregate centers in NaCl:OH-. In particular, we have studied the properties of the laser-active (F2+)H centers. The formation of the (F2+)H center is temperature dependent. One mechanism operates below and another above 50 K. The bleaching of the (F2+)H-center emission observed under intense Nd:YAG or He-Ne laser irradiation, due to reorientation of the emitting centers, is accompanied by a process at low temperatures that is predominant at temperatures below 20 K and involves the ionization of the X or F3 centers always present in the crystal. Thus the laser-active (F2+)H centers are destroyed by electron capture but are reformed by F-band light irradiation, which reverses the bleaching process. © 1991 The American Physical Society.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.