Accession Number : AD0654047

Title :   INTERPRETATION OF THE OPTICAL SPECTRUM OF YB3+ IN CDF2.

Descriptive Note : Doctoral thesis,

Corporate Author : POLYTECHNIC INST OF BROOKLYN N Y

Personal Author(s) : Abbruscato,Victor J.

Report Date : JUN 1967

Pagination or Media Count : 81

Abstract : The optical absorption spectra of Yb(3+) in CdF2 and of Yb(3+) in CdF2 in the presence of various co-dopants such as Na(+), Y(3+), and Eu(3+) were recorded and the oscillator strengths of the main absorptions of the Yb(3+) in the 10,000/cm region were calculated. Also, the Electron Spin Resonance (ESR) spectra of Yb(3+) in CdF2 and Yb(3+) in CdF2 in the presence of Na(+), 2% Y(3+) and 10% Y(3+) were recorded. Non-cubic spectra were observed only in the case of the Yb(3+) -Na(+) -CdF2 and Yb(3+) -10% Y(3+) -CdF2 samples. The former non-cubic spectrum was interpreted assuming a rhombic distortion with the major distortion axis along the 110 direction, while the latter could not be interpreted due to the broadness of the absorptions. From the results of these measurements and the comparison to the optical spectra of Yb(3+) in other systems, it has been concluded that the previous interpretation of the optical spectrum of Yb(3+) in CdF2 is incorrect. It is the contention of this thesis that the main absorption line at 10,250/cm is not due to an internal f-f transition but is due to some other mechanism. Possible mechanisms are proposed based on some of the unusual physical properties of trivalent rare earth ions in CdF2. (Author)

Descriptors :   (*OPTICAL ANALYSIS, *YTTERBIUM), (*CADMIUM COMPOUNDS, OPTICAL ANALYSIS), FLUORIDES, ELECTRON PARAMAGNETIC RESONANCE, IONS, DISTORTION, RARE EARTH ELEMENTS, CRYSTALS, ABSORPTION, PHYSICAL PROPERTIES, ABSORPTION SPECTRA, TABLES(DATA), CRYSTAL GROWTH, DOPING, SYMMETRY(CRYSTALLOGRAPHY), PARAMAGNETIC RESONANCE, EXCITATION, SPECTROMETERS

Subject Categories : Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE