Effect of Pressure on the Optical Absorption of the Activator System in KCl: Tl

Peter D. Johnson; Ferd E. Williams

doi:10.1103/PhysRev.95.69

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Effect of Pressure on the Optical Absorption of the Activator System in KCl: Tl

Peter D. Johnson and Ferd E. Williams

General Electric Research Laboratory, Schenectady, New York

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Phys. Rev. 95, 69 – Published 1 July, 1954

DOI: https://doi.org/10.1103/PhysRev.95.69

Abstract

The optical absorption spectrum of thallium-activated potassium chloride has been measured at 2000 atmospheres. The absorption band corresponding to the ${}^{1}S_{0} \to {}^{3}P_{1}^{0}$ transition of ${Tl}^{+}$ shifts 4 A to longer wavelengths at this pressure. The spectral shift is calculated theoretically from the quantitative configuration coordinate model of KCl: Tl. The occupation probabilities of accessible atomic configurations of the activator system are dependent on pressure, whereas the transition energy for a particular configuration is independent of pressure. The pressure is considered to act hydrostatically on six pistons corresponding to the ${Cl}^{-}$ nearest neighbors. The theoretical shift in absorption under 2000 atmospheres pressure is 5 A to longer wavelengths.

References (3)

F. E. Williams, J. Chem. Phys. 19, 457 (1951) J. Phys. Chem. 57, 780 (1953)
F. E. Williams and M. H. Hebb, Phys. Rev. 84, 1181 (1951)
P. D. Johnson, J. Opt. Soc. Am. 42, 278 (1952)

[c1] F. E. Williams, J. Chem. Phys. 19, 457 (1951) J. Phys. Chem. 57, 780 (1953)

[c2] F. E. Williams and M. H. Hebb, Phys. Rev. 84, 1181 (1951)

[c3] P. D. Johnson, J. Opt. Soc. Am. 42, 278 (1952)

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Effect of Pressure on the Optical Absorption of the Activator System in KCl: Tl

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