Sharp resonance modes of cubic symmetry rare-earth ions in CaF2-type crystals

Autor:	Glynn D. Jones, Steven P. Jamison, Peter P Pavlichuk, Roger J. Reeves
Rok vydání:	1999
Předmět:	Photoluminescence Absorption spectroscopy Chemistry Inorganic chemistry Doping Biophysics Infrared spectroscopy Resonance General Chemistry Radius Condensed Matter Physics Biochemistry Molecular physics Atomic and Molecular Physics and Optics Ion Vibronic spectroscopy
Zdroj:	Journal of Luminescence. :429-434
ISSN:	0022-2313
DOI:	10.1016/s0022-2313(99)00138-6
Popis:	The inclusion of NaF or LiF into rare-earth (R 3+ ) doped CaF 2 and SrF 2 increases the concentration of isolated R 3+ ions to the point where these cubic symmetry centers dominate the defect site distribution. The optical spectra of these centers are noteworthy in revealing sharp vibronic lines that have intensities and line widths comparable to their parent zero-phonon transition. The vibronic frequency, of approximately 140 cm −1 , is observed to decrease along the rare-earth series. It is proposed that these vibronic transitions are associated with low-frequency resonance modes of the heavy trivalent R 3+ ions substituting for the divalent cations. The loose packing of the smaller radius R 3+ ions contributes to the weak coupling to the host giving rise to the sharp vibronic transitions.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a920e4f37bc83db4457020f0df013f4c https://doi.org/10.1016/s0022-2313(99)00138-6 Zobrazit plný text záznamu Full Text from ScienceDirect