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The Structure of Pb + Laser Centres in KMgF 3 from Optically Detected Electron Spin Resonance and Electron Nuclear Double Resonance
Author(s) -
Fockele M.,
Lohse F.,
Spaeth J.M.
Publication year - 1989
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1002/ijch.198900003
Subject(s) - chemistry , hyperfine structure , electron paramagnetic resonance , vacancy defect , excitation , laser , resonance (particle physics) , electron , atomic physics , electron nuclear double resonance , spectral line , nuclear magnetic resonance , crystallography , physics , optics , quantum mechanics , astronomy
Laser action of X‐rayed lead doped KMgF 3 crystals from an unknown defect was recently reported by Hörsch and Paus. 1 By applying optical detection of ESR and ENDOR, the structure of two very similar laser active Pb centres could be determined from the selectively measured hyperfine and superhyperfine interactions. They consist of a Pb + substituting for a K + next to an F − vacancy along <110> with a next nearest K + vacancy for charge compensation in two different positions (Pb + (1) centres). The absorption band for the excitation of the laser emission at 1.4eV could be identified from the optical excitation spectra and from a special magneto‐optical ESR technique. The structural properties, as well as the explanation of their laser properties within a crystal field model, are analogous to those of Tl 0 (1) centres in alkali halides and Pb + (1) centres in alkaline earth fluorides. A Pb ++ perturbed F A centre was also observed.