High resolution MCD and phosphorescence excitation spectroscopy of Mn 2+ in KMgF 3 and KZnF 3

Author： Ferguson J. Güdel H.U. Krausz E.R. Guggenheim H.J.

ISSN： 1362-3028

Source： Molecular Physics, Vol.28, Iss.4, 1974-10, pp. : 879-891

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Abstract

A combination of high resolution MCD and phosphorescence excitation techniques has been used to determine, for the first time, the optical spectra of single Mn 2+ ions in the cubic perovskite hosts KMgF 3 and KZnF 3 . Particular attention has been paid to transition mechanisms, spin-orbit effects and vibronic structure, and the experimental results have been compared with theoretical crystal field calculations based on the complete d 5 configuration. All of the states arising from the 4 G , 4 P and 4 D terms have been observed and a dynamic Jahn-Teller effect has been observed in the 4 T 1 g a state. Both magnetic dipole and electric dipole (vibrationally induced) absorption processes occur and the former is most important for transitions to the 4 T 1 g a , 4 A 1 g , 4 T 1 g b states. Calculated and observed magnetic dipole intensities are in good agreement. A complete analysis of the zero phonon (magnetic dipole) lines and vibronic (magnetic and electric dipole) side-bands associated with transitions to 4 A 1 g and 4 E g a states has been made.