Zobrazeno 1 - 10
of 94
pro vyhledávání: '"L. Taurel"'
Publikováno v:
Physica Status Solidi (b). 86:493-496
First-order Raman spectra of CsF (F centres) studied in resonance with the F band (610 and 640 nm) at T = 10 K are described. The acoustic (43, 48, and 76 cm−1) and optical (135 and 137 cm−1) modes are due to electron-phonon interactions involvin
Publikováno v:
Le Journal de Physique Colloques. 45:C5-69
Publikováno v:
Radiation Effects. 98:301-304
In alkali halides, interstitial halide atoms are created under ionizing radiations at room temperature and their stabilization is known to play an important role in the coloration process. In alkali iodides such as KI, the coloration efficiency is kn
Publikováno v:
Le Journal de Physique Colloques. 37:C7-227
X-irradiation at T=78K of SrClF crystals containing OH- ions lead to the formation of U2(Hi0) centres. These centres are thermally stable up to T=140K. The magnetic properties and thermal stability of the U2 centre are compared to those of the U2 cen
Publikováno v:
Le Journal de Physique Colloques. 37:C7-230
Formation of aggregates of hole centres (called E centres) in SrCl2 : M+ (M = Na, K, Rb) by X-irradiation between 130 K and 230 K is studied. The results show that the E centre is formed from two positive hole centres. The main properties of the E ce
Publikováno v:
Journal of Physics C: Solid State Physics. 10:2285-2293
After X-irradiation in the range 10-145K, SrCl2 doped with M+(M+=Na+,K+,Rb+) gives rise to a post-luminescence whose spectrum, independent of the M+ cation nature, is formed principally of a broad band at 500 nm. The hyperbolic law of isothermal deca
Publikováno v:
Physical Review B. 18:885-900
Publikováno v:
Physica Status Solidi (b). 92:447-453
Raman spectra of F-centres in NaCl are very dependent on colouration method. First-order spectra of “isolated” F-centres are very well interpreted when a 70 and 10% softening in the interionic force constant between the F-centre and its 1 nn's an
Publikováno v:
Journal of Physics and Chemistry of Solids. 37:961-966
Magnetic and optical properties of two types of F centres, calledF(F−) and F (Cl−), created in BaClF and SrClF tetragonal crystals are described. The experimerttal position of the absorption bands and the [g] principal values of each centre are t
Publikováno v:
Journal of Physics C: Solid State Physics. 15:L119-L123
V centres have been studied in pure KBr using optical absorption and Raman scattering experiments. Raman spectra show that Br3- ions can be created in samples X-irradiated at 190K. They are correlated with the V4 absorption band (270 nm). After X-irr