The total Penning ionization cross sections for Cd and Zn for He(2 3S1) atoms have been measured. The method used was that of Penning ion collection from a vapor cell through which a He(2 3S1) beam was passed. The beam energy was 66 meV with a velocity spread of 45%. The measured cross sections were 60(±22) and 17(±7) Å2 for the Cd and Zn targets, respectively.
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Fahey et al. (1980) studied this question.
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