Extensive eigenchannel R -matrix study of the H sup minus photodetachment spectrum

Journal Article · Fri Jan 31 23:00:00 EST 1992 · Physical Review A. General Physics; (United States)

DOI:https://doi.org/10.1103/PhysRevA.45.1587· OSTI ID:7047732

Sadeghpour, H R ^[1]; Greene, C H ^[2]; Cavagnero, M ^[3]

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1. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138 (United States)
2. Department of Physics, University of Colorado, Boulder, Colorado 80309-0440 (United States) Joint Institute for Laboratory Astrophysics, University of Colorado, Boulder, Colorado 80309-0440 (United States)
3. Department of Physics and Astronomy, The University of Kentucky, Lexington, Kentucky 40506-0055 (United States)

We combine an eigenchannel {ital R}-matrix calculation with an analytic description of electron motion in a dipole field to predict photodetachment cross sections of the hydrogen negative ion, including resonant structures up to the {ital n}=4 hydrogenic threshold. Partial cross sections for the production of hydrogen-atom fragments in states with specific principal quantum numbers {ital n} are also presented for comparison with a recent experiment. An analysis of the delay-time matrix indicates that the autodetaching Feshbach resonances decay primarily into the nearest energetically accessible continuum channel, an observation which is not at all apparent from the calculated and observed partial cross sections, but has been anticipated in previous theoretical work. We find, for instance, that the {sub {ital n}=4}{l brace}{ital v}=0{r brace}{sub {ital m}=4}{sup {ital A}=+} resonant state below the H({ital n}=4) threshold decays 73% of the time to the {sub 3}{l brace}0{r brace}{sup +} photodetachment channel.

• OSTI ID: 7047732
• Journal Information: Physical Review A. General Physics; (United States), Journal Name: Physical Review A. General Physics; (United States) Vol. 45:3; ISSN 1050-2947; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

664200* -- Spectra of Atoms & Molecules & their Interactions with Photons-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ANIONS
CHARGED PARTICLES
CROSS SECTIONS
DIFFERENTIAL EQUATIONS
DIPOLES
ELECTRONS
ELEMENTARY PARTICLES
ENERGY-LEVEL TRANSITIONS
EQUATIONS
EQUATIONS OF MOTION
EXCITATION
FERMIONS
HYDROGEN IONS
HYDROGEN IONS 1 MINUS
IONIZATION
IONS
LEPTONS
MATRICES
MULTIPOLES
PARTIAL DIFFERENTIAL EQUATIONS
PHOTOIONIZATION
R MATRIX