Saddle-point technique for helium in the elastic- and inelastic-scattering energy region

Journal Article · Mon Sep 01 04:00:00 EDT 1980 · Phys. Rev., A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.22.835· OSTI ID:5056974

Chung, K T; Davis, B F

The saddle-point technique is applied to the helium atom below the ionization threshold and for /sup 1/P and /sup 3/P resonances in the elastic-, and inelastic-scattering energy region. The results generally support the assertion that the method gives the best square-integrable approximation within the inner-shell vacancy picture for excited or autoionizing states. For the resonance where the Feshbach shift is negative, the saddle-point method gives essentially the same result as that of the QHQ approximation. However, for resonances with a large positive Feshbach shift, the results of the new method are substantially better. For example, for the lowest /sup 1/P resonance in the inelastic-scattering region, we get 69.901 eV, the experimental result is 69.90 +- 0.04 eV by Madden and Codling, 69.92 +- 0.03 eV by Dhez and Ederer.

• Research Organization: Department of Physics, North Carolina State University, Raleigh, North Carolina 27650
• OSTI ID: 5056974
• Journal Information: Phys. Rev., A; (United States), Journal Name: Phys. Rev., A; (United States) Vol. 22:3; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
AUTOIONIZATION
CRYOGENIC FLUIDS
ELEMENTS
ENERGY LEVELS
EXCITED STATES
FLUIDS
HELIUM
IONIZATION
NONMETALS
P STATES
RARE GASES
SPECTRA
X-RAY SPECTRA