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[en] Differential cross sections for excitation to the n = 2 states of He are studied with an electron-impact spectrometer from threshold to 4 eV above. We observe pronounced angle-dependent structures in threshold excitation to the 2 3P state and in near-threshold excitation in the 2 3S state. Together, these experimental findings and recent theoretical considerations suggest the existence of a new 2P resonance near 20.8 eV
Journal
Phys. Rev., A; ISSN 0556-2791; 
; v. 23(6); p. 3324-3327
; v. 23(6); p. 3324-3327