Fundamental absorption edge of PbF2 and Cd1xPbxF2 crystals

Abstract
The measured evolution of the fundamental absorption edge in mixed Cd1x Pbx F2 (0≤x≤1) indicates that it is dominated by the weakly forbidden Pb2+ ‘‘atomiclike’’ 6s2→6s6p (1 S03 P1) transition peaked at hν=5.7 eV.