Optical Absorption Spectra of EuAlO₃

Abstract

The absorption spectra of EuAlO 3 were measured in the frequency range, 17100–21500 cm -1 , in which the transitions from the ground state 7 F 0 to the Stark components of the three lowest excited multiplets of 5 D J ( J =0, 1, 2) states were observed. The spectral lines were assigned to the transitions to the crystalline-field split components of 5 D J ( J =0, 1, 2) of Eu 3+ ions with the C s site symmetry. The crystalline field analysis of these lines was made by assuming the approximate site symmetry C 2v . The observed linewidths are 3–5 cm -1 at 1.9°K and much broader than those in dilute YAlO 3 :Eu 3+ . Furthermore, some of the lines seem to have two components with comparable intensity. The sources of these additional broadenings and structures of the lines are discussed. Many sharp and weak satellites were observed near the main lines. The origins of these satellites are also discussed.