Zobrazeno 1 - 10
of 58
pro vyhledávání: '"Glynn D. Jones"'
Publikováno v:
physica status solidi (c). 1:3011-3014
Infrared-absorption lines of the (X,Y) and Z local modes of hydrogenic C4v centres in rare-earth doped CaF2 and SrF2 have differing 10 K linewidths, attributed in part to one-phonon decay from the upper to the lower frequency local mode. However for
Publikováno v:
Molecular Physics. 102:1367-1376
Hyperfine structure is observed on several infrared transitions to the 5I7 and 5I6 multiplets of the Ho3+ C4v centre in CaF2. Particularly complex and detailed hyperfine structures are observed for transitions to the Y3 level of the 5I7 multiplet, wh
Autor:
Jon-Paul R. Wells, Glynn D. Jones
Publikováno v:
Journal of Luminescence. 108:221-224
The local mode lineshape for substitutional H − ions in CaF 2 shows a broadened, two peak structure when La 3+ co-doping up to 6 mol% is included. Pump-probe measurements of the local mode lifetime show a decrease in the anharmonic decay rate as a
Autor:
Makoto Honda, Hiroshi Takahashi, M. Sakai, Jon-Paul R. Wells, Mitsuo Yamaga, Satoshi Yabashi, Yuki Masui, Glynn D. Jones, Nobuhiko Sarukura
Publikováno v:
Journal of Luminescence. 108:307-311
Interconfigurational 4f↔5d VUV absorption and luminescence, intra-4f 1 IR absorption and X-band EPR measurements have been carried out on CaF 2 :Ce 3+ crystals co-doped with Na + and Li + ions. For both Li + and Na + co-doping, cubic, new tetragona
Autor:
Glynn D. Jones, Jon-Paul R. Wells
Publikováno v:
Journal of Luminescence. :169-172
A single H − site with axial symmetry is observed for LiYF 4 crystals while two distinct H − sites of axial and rhombic symmetry are observed for KY 3 F 10 crystals. Infrared pump–probe measurements yield 10 K lifetimes of 2.7 and 14 ps for the
Publikováno v:
physica status solidi (a). 191:628-632
Excitation and emission spectra of CaF 2 :Sr single crystals with various strontium concentrations have been investigated by the method of luminescence spectroscopy. A new emission band peaking at 4.1 eV has been found and attributed to the radiative
Publikováno v:
Journal of Luminescence. :729-732
Three-beam normalised pump–probe measurements for the Z-localised vibrational mode of H − in LaF 3 yield a 10 K population decay time ( T 1 ) of 49 ps. The temperature decrease of this T 1 time is fitted to two-phonon anharmonic decay together wi
Publikováno v:
The Journal of Chemical Physics. 115:9393-9400
Site-selective luminescence spectroscopy of the 4f2−4f5d(fd) transition is reported for six different Pr3+ sites in CaF2:Pr3+. In addition to the naturally occurring distantly charge-compensated cubic site and the locally charge-compensated Pr3+–
Autor:
Glynn D. Jones
Publikováno v:
Radiation Effects and Defects in Solids. 155:331-338
H− and D− ions are excellent spectroscopic probes of ionic sites in fluoride crystals. The H− or D− ions substitute for F− ions and produce sharp infrared absorption lines, whose spectroscopy reveals hydrogenic centres for co-doped R3+ or a
Autor:
Glynn D. Jones, Roger J. Reeves
Publikováno v:
Journal of Luminescence. :1108-1111
Co-doping of rare-earth (R3+)-doped CaF2 and SrF2 with LiF, NaF or KF enhances the concentration of single R3+ centres of cubic symmetry. C2v centre are also produced in which the R3+ ions are charge-compensated by Li+, Na+ or K+ ions located in the