Radiation Effects in CaF2:Sm

Abstract

The absorption spectra of Sm3+ and Sm2+ in CaF 2 have been measured from 200-800 m at room and liquid-nitrogen temperatures. A strong divalent absorption band at 620 m has an effective oscillator strength of 1.1×10-2. This band has been used to study the reduction of CaF2:Sm3+ by ionizing radiation. For some samples, the reduction is as large as 50. The kinetics of the reduction is obscured due to the presence of oxygen and other crystal defects. The data do indicate that the charge compensator for Sm3+ in CaF2 is an interstitial F- ion. © 1962 The American Institute of Physics.