Investigation of the Lattice Dynamics of KBr: Sm²⁺ by Means of Vibronic Spectra

Abstract

A low-symmetry (Cz v) model of the lattice disturbance in the systemKBr :Sm*+ is employed to calculate the vibronic sideband structure of a 4 f 4 f transition. The result yields improvement over earlier calculations, which were based on higher-symmetry models. The improvement is such that the chosen model may be considered to be realietic. Ein Modell niederer Symmetrie

The Jahn-Teller effect and vibronic coupling at deep levels in diamond

“…Many vibronic spectra in diamond have phonons spanning the full range of allowed lattice frequencies, 0 < fiw < 165 meV (Warren et a1 1965, Peckhain 1967. Peaks in the phonon sidebands are then expected to occur at vibrational frequencies with high densities of lattice modes (see the calculations of, for example, Bron (1969), Ritter and Markham (1969), Kuhner and Wagner (1970) and Sangster (1972), and the experiments of Hughes (1966) and Pierce (1966) , Nedzvetskii and Gaisin 1974, 1975. These critical point analyses imply that substantial regions of the crystal must be vibrating and therefore the frequencies of vibration will be insensitive to changes in the electronic orbitals localised on the defect.…”