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Temperature Dependence Of Alignment Production In He I By Beam-Foil Excitation, Timothy J. Gay, H. G. Berry

Timothy J. Gay Publications

We have measured the dependence upon target-foil temperature of the linear polarization fraction (M / I) of the 2s¹S-3p¹P, 5016-Å transition in He I for ion energies between 60 and 180 keV. The thin carbon exciter foils were heated externally by Nichrome resistance elements. The measurements of Hight et al. are duplicated; the energy and current dependencies of M / I are the same, assuming correspondence between beam heating and external heating. We also observe that γ, the number of secondary electrons produced per incident ion, decreases with increasing foil …