Observation of a Broad Resonance in the 2³S Excitation of Helium by Electron Impact

Authors

G. B. Crooks, University of Nebraska - Lincoln
R. D. DuBois, University of Nebraska - Lincoln
D. E. Golden, University of Nebraska - Lincoln
M. Eugene Rudd, University of Nebraska - LincolnFollow

Date of this Version

1972

Comments

Published in Physical Review Letters 29, 327 - 329 (1972)
©1972 The American Physical Society
URL: http://link.aps.org/doi/10.1103/PhysRevLett.29.327
DOI: 10.1103/PhysRevLett.29.327

Abstract

We have observed a broad P-wave resonance at about 50 eV primary energy in the angular distribution of electrons scattered after excitation of the 2³S state of helium. The resonance has a width of about 15 eV and affects the differential excitation cross section by more than 3 orders of magnitude. It is suggested that this resonance is associated with the temporary formation of triply excited states of the negative helium ion.