ELECTRON-SPIN PARAMAGNETIC RESONANCE STUDIES OF NEUTRON-IRRADIATED LiF

Journal Article · Fri Mar 01 04:00:00 EST 1963 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.129.1919· OSTI ID:4753632

Kaplan, R; Bray, P J

The electron-spin resonance spectra of F centers in neutron-irradiated crystals of Li/sup 6/F, Li/sup 7/F, and LiF of normal isotopic content have been studied in order to test existing theories of F-center resonance absorption. The spectrum for Li/sup 6/F has several interesting features and corfirms the ENDOR measurements of Holton,Blum, and Slichter for crystals of normal isotopic content. Specimens of the latter composition have been subjected to a wide range of neutron doses in the present work and their spectra examined. For doses smaller than about 10/sup 17/ n/cm/sup 2/ the spectra exhibit a resolved hyperfine structure on a Gaussian envelope. For doses exceeding 10/sup 17/ n/ cm/sup 2/ changes are observed in resonance linewidth, shape, and spin-lattice relaxation time. The observntions appear to be consistent with the view that the radiation- induced defects are not uniformly distributed in the cry als. Exchange interactions between paramagnetic defects in egions of high defect concentration appear to be respon ible for the observed changes in the resonance spectra as the neutron dose is increased. Crystals which received doses in excess of 10/sup 19/ n/cm/sup 2/ exhibit resonance absorption characteristic of conduction electrons in small particles of lithium metal. Annealing and saturation studies give some information regarding the spin-lattice relaxation of the conduction electrons in the metal particles. (auth)

• Research Organization: Brown Univ., Providence, R.I.
• NSA Number: NSA-17-013149
• OSTI ID: 4753632
• Journal Information: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 129; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ABSORPTION
ANNEALING
CRYSTALS
DEFECTS
DISTRIBUTION
ELECTRONS
F CENTERS
HYPERFINE STRUCTURE
INTERACTIONS
IRRADIATION
ISOTOPE EFFECTS
LATTICES
LITHIUM 6
LITHIUM 7
LITHIUM FLUORIDES
MAGNETIC RESONANCE
METALS
NEUTRON FLUX
NEUTRONS
PARTICLES
PHYSICS
RADIATION DOSES
RADIATION EFFECTS
RELAXATION
SPECTRA
SPIN
VACANCIES
WIDTH