Accession Number : AD0667972

Title :   OSCILLATOR STRENGTHS OF F AND M CENTERS IN POTASSIUM CHLORIDE,

Corporate Author : FRANKFORD ARSENAL PHILADELPHIA PA PITMAN-DUNN RESEARCH LABS

Personal Author(s) : Shields,Michael A.

Report Date : MAR 1968

Pagination or Media Count : 19

Abstract : The optical absorption coefficients and the half-widths of the F and M bands were measured at room temperature in additively colored KCl in which the relative proportions of the color centers were varied by room temperature F-light irradiation. Care was taken to reduce the concentrations of higher aggregate centers by suitable annealing. In interpreting the results, the F center was considered to be a negative ion vacancy with an associated electron and the M center, a pair of F centers in nearest neighbor <110> positions. The slope of the alpha-F vs. alpha-M curve yielded an average value of the ratio of the M- and F-center oscillator strengths, fM/fF = 0.43, in agreement with other measurements. The oscillator strength is the probability of occurrence of the color center optical transition responsible for the absorption peak. An attempt to obtain an absolute value of the F-center oscillator strength by comparing pH and optical measurements is described. (Author)

Descriptors :   (*POTASSIUM COMPOUNDS, COLOR CENTERS), (*COLOR CENTERS, ABSORPTION SPECTRA), CHLORIDES, ELECTRON TRANSITIONS, PROBABILITY, CRYSTAL LATTICES, PH FACTOR

Subject Categories : Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE