It is demonstrated that in a Penning collision of optically oriented metastable helium atoms with an impurity metal atom such as barium, both the longitudinal and transverse components of spin angular momentum are conserved. This results in a polarization of the ion which may be detected by optical emission in the case of excited ion levels or absorption for the ground states. A series of experiments is described which demonstrates the spin dependence of the Penning-collision process. The magnetic resonance of excited-state ions may be observed directly; from the resonance-linewidth radiative lifetimes may be measured. © 1974 The American Physical Society.
L. D. Schearer, "Optical Pumping In A Flowing Helium Afterglow With Additive Metal Impurity Atoms," Physical Review A, vol. 10, no. 4, pp. 1380 - 1394, American Physical Society, Jan 1974.
The definitive version is available at https://doi.org/10.1103/PhysRevA.10.1380
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01 Jan 1974