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ESR on UV Irradiated Lead Halides at 80° K
Author(s) -
Arends J.,
Verwey J. F.
Publication year - 1967
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.19670230111
Subject(s) - electron paramagnetic resonance , irradiation , ion , halide , chemistry , metal , photodissociation , inorganic chemistry , doping , decomposition , nitrogen , liquid nitrogen , analytical chemistry (journal) , photochemistry , materials science , nuclear magnetic resonance , physics , organic chemistry , chromatography , nuclear physics , optoelectronics
Results are presented of electron spin resonance measurements on uv irradiated single crystals of PbCl 2 , PbBr 2 , and PbI 2 at liquid nitrogen temperature. Both pure single crystals and PbBr 2 crystals doped with Tl + , Ag + , Cu + , and Bi +++ ions are studied. The ESR spectra indicate that Pb + ions occur as an initial step in the photochemical decomposition. These ions are probably present in clusters of two or three and coagulate to metallic lead particles. The ESR signals due to the conduction electrons of these small lead particles are studied. Some hole centres which are formed during the irradiation are also described. The experiments show that the ambient conditions of the crystals are much more important in the photolysis process than the presence of foreign ions.