YAlO3 crystals have been prepared with small percentages of different rare earths substituted for yttrium. The absorption and luminescence spectra of the samples activated with Dy, Ho, Er, Tm, and Yb have been measured at 77 K. An analysis of these spectra gave the positions of many of the crystalline Stark levels. Stimulated emission has been observed from Ho3+, Er3+, and Tm3+ ions in crystals of YAlO3.

physica status solidi (a)Sep 16, 197342 citations

Optics and Spectroscopy

Absorption and emission spectra of thallium atoms in crystalline rare gases

N. S. Mitchenko, Yu. B. Predtechenskiĭ, L. D. Shcherba

Published Nov 1, 1976• 3 citations

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Rare-gas-induced broadening and shift of two-photon transitions to intermediate

\mathsf{(n=9{-}14)}

Rydberg states of atomic thallium *

9^{2}S_{\frac{1}{2}}

7^{2}D_{\frac{5}{2},\frac{3}{2}}

8^{2}S_{\frac{1}{2}}

6^{2}D_{\frac{5}{2}}

, and

6^{2}D_{\frac{3}{2}}

were calculated for mercury thallium collisions. Data taken with the addition of argon and helium gases are given to indicate the variation of the intensity of the thallium lines as a function of argon and helium gas pressures at one constant thallium and three mercury temperatures. The explanation of the results depends on the role of mercury

6^{3}P_{1}

excited atoms, metastable atoms, and mercury molecules in collision with thallium atoms for energy exchange, and also requires the use of Winans' partial selection rule and other generally accepted ideas concerning energy transfer, emission, and absorption.