Accession Number : AD0665980

Title :   OPTICAL AND ELECTRON SPIN RESONANCE STUDIES OF THE ICL(-)V-K CENTER IN KCL:I.

Descriptive Note : Technical rept.,

Corporate Author : CORNELL UNIV ITHACA N Y MATERIALS SCIENCE CENTER

Personal Author(s) : Goldberg,Lawrence S. ; Meistrich,Marvin L.

Report Date : 29 FEB 1968

Pagination or Media Count : 38

Abstract : The ICl(-)V-K center, a <110>-oriented self-trapped hole center, was investigated in X-irradiated KCl:I and KCl:I:Pb at low temperatures by optical and electron spin resonance techniques. Three optical transitions are identified at 430, 840, and 1000 nm by anisotropic absorption measurements; their observed sigma polarizations and relative intensities are consistent with a molecular-orbital model modified for XY(-) molecule-ion centers. Pulse annealing experiments monitored by ESR and correlated with thermoluminescence data and absorption spectrum changes give information on the formation and thermal stability of ICl(-). An improved analysis of the ESR spectrum has been carried out taking into account deviations from axial symmetry. Calculations of the large iodine quadrupole interaction are extended to second-order perturbation theory, and observed forbidden transitions are fitted to these equations, allowing a determination of the sign, as well as the magnitude, of the quadrupole interaction. (Author)

Descriptors :   (*COLOR CENTERS, SPECTROSCOPY), SOLID SOLUTIONS, POTASSIUM COMPOUNDS, CHLORIDES, IODINE, LEAD(METAL), DAMAGE, RADIATION EFFECTS, CRYSTAL DEFECTS, ELECTRON PARAMAGNETIC RESONANCE, ELECTRON TRANSITIONS, SELECTION RULES(PHYSICS), THERMAL STABILITY, QUADRUPOLE MOMENT, ABSORPTION SPECTRA, PERTURBATION THEORY

Subject Categories : Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE