Structure of selenium-centered radicals. An electron spin resonance study of R/sub 2/SeHal trapped in single crystals. [X rays]
X-irradiated single crystals of Ph/sub 3/SeBr, Ph/sub 2/SeBr/sub 2/, and Ph/sub 2/SeCl/sub 2/ have been studied by ESR spectroscopy. In each crystal a radical species exhibiting anisotropic hyperfine interaction with the halogen nuclei has been trapped. The anti g tensors, the magnetic hyperfine tensors to the halogen nuclei, and the /sup 81/Br quadrupolar interaction tensors have been determined. The /sup 77/Se magnetic hyperfine tensor has also been obtained for the radical species trapped in Ph/sub 2/SeBr/sub 2/ and Ph/sub 2/SeCl/sub 2/. These tensors lead to the identification of Ph/sub 2/SeHal. The spin distribution is discussed; the unpaired electron lies probably in a Se-Hal sigma* orbital which is oriented perpendicularly to the CSeC plane. The spin distribution seems to be very sensitive to the nature of the host matrix. 2 figures, 2 tables.
- Research Organization:
- Univ. of Geneva, Switzerland
- OSTI ID:
- 5772701
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 83:22; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400600* -- Radiation Chemistry
ANGULAR MOMENTUM
ANISOTROPY
BROMINE COMPOUNDS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
CHLORINE COMPOUNDS
CLOSED CONFIGURATIONS
CRYSTALS
DECOMPOSITION
ELECTROMAGNETIC RADIATION
ELECTRON SPIN RESONANCE
HALOGEN COMPOUNDS
HYPERFINE STRUCTURE
IONIZING RADIATIONS
MAGNETIC FIELD CONFIGURATIONS
MAGNETIC RESONANCE
MONOCRYSTALS
MULTIPOLAR CONFIGURATIONS
ORGANIC COMPOUNDS
ORGANOMETALLIC COMPOUNDS
PARTICLE PROPERTIES
QUADRUPOLAR CONFIGURATIONS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
RADICALS
RADIOLYSIS
RESONANCE
SELENIUM COMPOUNDS
SPIN
TENSORS
X RADIATION