CROSS-RELAXATION IN MAGNETIC-RESONANCE AS A TOOL TO STUDY SPATIAL CORRELATIONS BETWEEN DEFECTS IN INSULATORS

Authors
SPAETH JM KOSCHNICK FK MEISE W ROGULIS U
Citation
Jm. Spaeth et al., CROSS-RELAXATION IN MAGNETIC-RESONANCE AS A TOOL TO STUDY SPATIAL CORRELATIONS BETWEEN DEFECTS IN INSULATORS, Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms, 91(1-4), 1994, pp. 175-182
Citations number
9
Categorie Soggetti
Physics, Nuclear","Nuclear Sciences & Tecnology","Instument & Instrumentation
Journal title
Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms → ACNP
ISSN journal
0168583X
Volume
91
Issue
1-4
Year of publication
1994
Pages
175 - 182
Database
ISI
SICI code
0168-583X(1994)91:1-4<175:CIMAAT>2.0.ZU;2-G
Abstract
Direct experimental evidence for the spatial correlation between param agnetic defects can be obtained by measuring the dipole-dipole interac tion-induced cross relaxation effects between the defects using optica l detection of the electron paramagnetic resonance via the magnetic ci rcular dichroism of the absorption. This novel experimental method is explained. It is applied to the formation of F and H centres during re laxation of the self-trapped exciton in KBr at 1.5 K. Direct experimen tal evidence is presented that F and H centres are separated by four l attice spacings along [110] directions. This correlation is lost after warming to 30 K when H centres can diffuse away.