Research Papers in Physics and Astronomy

 

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.

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