DigitalCommons@University of Nebraska - Lincoln

Title

Excitation of the (2p²)³P State of Helium near Threshold

Authors

Paul Burrow, University of Nebraska - Lincoln

Document Type

Article

Date of this Version

November 1970

Comments

Published by American Physical Society. Phys. Rev. A 2, 1774 (1970). http://pra.aps.org. Copyright © 1970 American Physical Society. Permission to use.

The trapped-electron method is applied to the excitation by electron impact of the (2p²)³P state, the lowest doubly excited state of helium which is stable against auto-ionization. The energy of this state, 59.64±0.08 eV, is in good agreement with theory. An estimate of the slope of the total cross section for excitation of the (2p²)³P state at threshold gives a value of 4 × 10^-20 cm²/eV.