Accession Number:

AD0600293

Title:

THE ULTRAVIOLET ABSORPTION SPECTRA OF RUBY.

Descriptive Note:

Scientific rept. no. 1,

Corporate Author:

MITHRAS INC CAMBRIDGE MASS

Personal Author(s):

Report Date:

1963-10-01

Pagination or Media Count:

28.0

Abstract:

The ultraviolet absorption spectra of ruby were studied in absorption and fluorescence. Measurements were performed on heavily doped rubies of up to 4.3 percent Cr. This data was correlated with excited state absorption experiments performed on the long lived 2E level. The spectra are assigned on the basis of the simple crystal field theory, taking into account intensities and polarizations. The charge transfer spectrum of Cr3d3 in Al2O3 is also discussed. Evidence is found of spin forbidden bands doublets borrowing intensity from charge transfer spectra. This probably explains the origin and intensity of the so-called forbidden charge transfer bands from 40,000cm to 50,000cm in ruby. Discussed in brief are details of the spectra, such as the trigonal field splitting, vibrational structure, and the pair bands at about 28,000cm to 30,000cm, discovered by Linz and Newnham. A number of possible explanations of the latter are put forward in terms of similar spectra observed in HN35Cr - O - Cr HN35 4, or the Pr Cl3 fluorescence studied by Varsanyi and Dieke. Finally, the relevance of the work to the operation of ruby optical masers is touched upon. Specifically, some unique harmonic experiments are suggested. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE