Accession Number : AD0457119


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


Descriptive Note : Quarterly progress rept. no. 8 (Final) 16 Sep15 Dec 64,


Corporate Author : COLUMBIA RADIATION LAB NEW YORK


Personal Author(s) : Novick, R


Report Date : 15 Dec 1964


Pagination or Media Count : 60


Abstract : A higher-mode, higher-Q, vacuum-tight cavity has been used to enable operation of the rubidium maser on field-independent transitions. The need for multiple bulky magnetic shields is thereby removed. The sensitivity to the ambient ac field is greatly reduced and the frequncy and amplitude stability have been improved. Further study of the photon-echo phenomenon has established a rough upper limit of 50 nsec for the relaxation time of the echo at 14 K. The relation of the polarization of the echo to the polarization of the incident pulses was found to be in agreement with theoretical prediction. A Stern-Gerlach type of deflection experiment was carried out with metastable autoionizing atoms. Potassium atoms in a particular state were observed to be deflected by a short inhomogenous magnetic field. The resulting beam pattern was found to be consistent with the assigned J value of the mestastable state. An optical pumping experiment has been designed to check with high precision whether or not free atoms possess electric dipole moments. The existence of an electric dipole moment would imply a breakdown of time-reversal invariance in either the electromagnetic interactions or weak interactions or both. (Author)


Descriptors :   *ATOMIC STRUCTURE , RUBIDIUM , IONIZATION , RELAXATION TIME , DIPOLE MOMENTS , CESIUM , HYPERFINE STRUCTURE , LITHIUM , SCATTERING , RADIOACTIVE DECAY , MOLECULAR STRUCTURE , MOLECULAR BEAMS , HIGH TEMPERATURE , SOLID STATE PHYSICS , NUCLEAR MAGNETIC RESONANCE , PLATINUM , RADIO ASTRONOMY , SUPERCONDUCTORS


Distribution Statement : APPROVED FOR PUBLIC RELEASE