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A technique which employs heretofore unappreciated aspects of the optical stimulated echo was developed and used to measure the total scattering cross section for Na(3S1/2)-He and Na(3P1/2)-He collisions. The repulsive-core-dominated Na(3S1/2)-He collision is found to be relatively soft. The cross section for degradation of the 3S1/2-3P1/2 superposition, determined from photon-echo-decay measurements, is anomalous in that it is smaller than the total elastic-scattering cross section with Na in either state separately.
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Mossberg et al. (1979) studied this question.
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