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Magnetic resonance in the ground states of 3 He has been studied through the interaction with metastable atoms in a gas discharge. Modulation showing the characteristics of the ground-state resonances is observed in a transverse beam of light absorbed by the metastable atoms. This is evidence of the transfer of transverse magnetization (coherence between eigenstates) by collision. A theory is developed which explains the observations in detail. The fact that coherence can be transferred by spin exchange in collision offers the possibility of exploitation in level-crossing or modulation experiments on spectroscopically inaccessible systems.
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Partridge et al. (1966) studied this question.
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