Abstract
Abstract : The reported physics research is part of an overall program to develop a nuclear magnetic resonance gyro that makes use of an optically pumped alkali metal vapor both to align the magnetic moments of noble gas nuclei and to detect the weak magnetic fields that are generated by the precession of these nuclear moments. A model for the role of the alkali-atom-noble-gas-atom Van der Waals molecule in the alkali electronic, noble gas nuclear spin exchange process has been developed. It has been found that spin exchange in the presence of the molecular formation is significantly more efficient than that for simple fly-by collisions. Preliminary experimental results have verified the general features of the molecular model. The theory for the quadrupole relaxation of noble gas nuclei in wall collisions has been developed. Experimental studies of krypton nuclear relaxation revealed a decay mode which was a function of the angular orientation of the cell in the apparatus and which was found to lead to a non-exponential type of decay signal. The model of the noble gas quadrupolar relaxation was found to explain all observations in the krypton experiments. (Author)
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