Pressure Effects and Configuration Coordinate Models of KCl(Tl)

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Report Number: AFOSR-TN-59-761
Author(s): Reiffel, L.
Corporate Author(s): Illinois Inst. of Tech. Armour Research Foundation
Date of Publication: 1959-07-24
Pages: 7
Contract: AF 49(638)113
DoD Task:
PB Number: PB143523
Identifier: AD0225665
AD Number: AD 225665

The pressure effects and configuration coordinate models of KCl(Tl) were studied by using, as the phosphor, a single KCl crystal grown from a melt containing 0.00018 Tl (mol fraction). Separation of the 3050A and 4750A emission was accomplished with Corning filters 9863 and 3389. At room temperature, the 3050A band showed a half-width of about 400A and a long wavelength tail which extended to 4200A, but only 1% of the emission was beyond 3800A. The 4750A band typically exhibited 1/3 the peak intensity of the 3050A emission with a half-width of about 1200A at room temperature. The crystal, installed in a pressure vessel with quartz optics, was stimulated with an Ir^192 gamma ray source in a W alloy collimator. Light emission was measured with a cooled-type photomultiplier tube driving a standard electrometer circuit and equipped with a sodium salicylate wavelength shifter. The band intensity ratio of 4750A emission to 3050A emission was not affected by pressure. At 19 degrees and 9.5 degrees, the factor changes in emission intensity of the 4750A band relative to the 3050A band for 40,000 psi were 0.96 and 0.98. At 0 degrees C the values were 1.04, 1.07 and 1.05 respectively. The small systematic change with temperature may be the result of excitation of trapping states which fed the emitting states under observation.

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