Study of the energy level scheme of under pressure

Autor:	Roberto Bini, Th. Tröster, Wilfried B. Holzapfel, L Ulivi, C Bungenstock, S Cavalieri
Rok vydání:	1998
Předmět:	Superposition principle Range (particle radiation) Nephelauxetic effect Chemistry Energy level splitting Mineralogy General Materials Science Context (language use) Condensed Matter Physics Molecular physics Spectral line Excitation Ambient pressure
Zdroj:	Journal of Physics: Condensed Matter. 10:9329-9342
ISSN:	1361-648X 0953-8984
DOI:	10.1088/0953-8984/10/41/015
Popis:	Excitation and luminescence spectra of in LaOCl were measured over the spectral range from to . At ambient pressure a total of 46 spectral lines could be observed. Under pressures up to 16 GPa, all lines exhibit a red-shift - however, with very different rates. From the spectral lines, the energy level scheme of the configuration could be partly derived. From 37 levels at ambient pressure, 30 could also be obtained under pressure. The energy level scheme is described by the use of free-ion ( (k = 2, 4, 6), ) and crystal-field parameters . According to the so-called nephelauxetic effect, the free-ion parameters and decrease under pressure. The magnitudes of the variations depend on the selected energy levels. Surprisingly the crystal-field strength shows a peculiar behaviour with an initial decrease and a minimum at 15 GPa. This behaviour can be explained within the context of the superposition model.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d5edd7bf62aae9bf38b3e8ec738fa4aa https://doi.org/10.1088/0953-8984/10/41/015