AN EXPERIMENTAL STUDY OF THE EFFECT OF AN ELECTRIC FIELD ON THE SHARP GREEN FLUORESCENCE TRANSITIONS OF E R IV IN SINGLE CRYSTALLINE FLUORITE,
Abstract
An investigation of the strong, green fluorescence spectra of calcium fluoride dilutely doped with erbium was made at 77 and 4.2 K. The spec tra were found to arise in three nonequivalent sites. The sites were identified as of cubic symmetry, of trigonally distorted cubic symmetry, and of tetragonally distorted cubic symmetry. Crystal field splitting schemes are proposed for each site. The ratio of the 6th order to 4th order potentials of the cubic crystal field is estimated to be -0.13. The relative shifts in the wavelengths of the sharp transitions to the low lying levels of the ground state, uniform, externally applied electric field were measured in the cubic sites at 77 and 4.2 K and in the trigonally distorted sites at 4.2 K. The measurements were made using three crystals with the field parallel to one of the (100), (110), and (111) directions of the crystal, respectively, and with applied fields up to 160 kv/cm. The results at 77 K show the presence of dominant nonlinear shifts superimposed on weak linear shifts. Dominant linear shifts were observed at 4.2 K. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1964
- Accession Number
- AD0434795
Entities
People
- Perry Pappas Yaney
Organizations
- University of Cincinnati