Accession Number : AD0430797

Title :   RESEARCH INVESTIGATION DIRECTED TOWARD EXTENDING THE USEFUL RANGE OF THE ELECTROMAGNETIC SPECTRUM.

Descriptive Note : Quarterly progress rept. no. 4, 16 Sep-15 Dec 63,

Corporate Author : COLUMBIA RADIATION LAB NEW YORK

Personal Author(s) : Novick,R.

Report Date : 15 DEC 1963

Pagination or Media Count : 77

Abstract : Direct evidence was obtained for the two-photon decay of the metastable state of the helium ion. Coincident counts were obtained between vacuum ultraviolet photon detectors which are exposed to a beam of metastable helium ions. Doubleresonance and level-crossing studies of the excited states of the chromium atom are continuing. Precise values of the gJfactors and hyperfine splittings were obtained and are being interpreted on the basis of core polarization and configuration mixing effects. It was shown that the metastable autoionizing lithium atom may be partially quenched with a magentic field of several thousand gauss. Partial success was achieved in the fabrication of optical doubleresonance cells for chemically reactive elements such as calcium. Theoretical studies are continuing on laser quenching of metastable atoms. Further results were obtained on the motional broadening of Rayleigh scattered light. An oscillation parameter of greater than unity was obtained with a pulsed optically pumped rubidium hyperfine maser. Studies of the microwave properties of model planetary atmospheres are continuing and a model of the Venusian atmosphere was constructed which is consistent with all available data. (Author)

Descriptors :   (*ELECTROMAGNETIC RADIATION, SCIENTIFIC RESEARCH), (*MICROWAVES, SCIENTIFIC RESEARCH), HELIUM, IONS, RADIOACTIVITY, ATOMS, MOLECULES, SOLID STATE PHYSICS, MASERS, MICROWAVE EQUIPMENT, LASERS, RADIO ASTRONOMY, CRYOGENICS, SUPERCONDUCTIVITY

Distribution Statement : APPROVED FOR PUBLIC RELEASE