Spectra and Energy Levels of Eu3+ in LaCl3

Abstract
The absorption and fluorescence spectra of Eu3+ in LaCl3 were obtained and analyzed. Crystal‐field calculations give good agreement with the observed Stark components for B20 = A20r2〉 = 89 cm—1, B40 = —38 cm—1, B60 = —51 cm—1, and B66 = 495 cm—1.