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Relaxation Process in U 3+ :Lacl 3 Detected by Resonant Self‐Absorption of Fluorescence
Author(s) -
Furrer R.,
Seiff F.,
Pelzl J.
Publication year - 1974
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220630215
Subject(s) - anisotropy , lanthanum , relaxation (psychology) , fluorescence , saturation (graph theory) , analytical chemistry (journal) , anhydrous , ion , materials science , chemistry , absorption (acoustics) , atmospheric temperature range , condensed matter physics , molecular physics , atomic physics , optics , inorganic chemistry , physics , thermodynamics , social psychology , psychology , mathematics , organic chemistry , chromatography , combinatorics , composite material
Using a pulse saturation method with optical detection of the recovery of fluorescent light, the temperature dependence and angular anisotropy of the spin‐lattice relaxation rate T 1 −1of U 3+ in anhydrous lanthanum trichloride has been measured. In the range 1.5 K ≦ T ≦ 4.2 K the direct relaxation process was found to be dominant, leading to a relaxation rate which can be fitted to the expression T ld −1= 4.16(5) T s −1 with the anisotropy coefficient of the direct process A (θ = 90°)/ A (θ = 0°) ≈ 10. Both results are comparable with the data measured for the corresponding 4f 3 ion, Nd 3+ in LaCl 3 .