Resonant two-color detachment of H[sup [minus]] with excitation of H([ital n]=2)

Journal Article · Wed Sep 01 00:00:00 EDT 1993 · Physical Review A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.48.2413· OSTI ID:6214902

Du, N; Starace, A F ^[1]; Cherepkov, N A ^[2]

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1. Joint Institute for Laboratory Astrophysics, University of Colorado, Boulder, Colorado 80309-0440 (United States) National Institute of Standards Technology, Boulder, Colorado 80303 (United States)
2. Department of Physics and Astronomy, The University of Nebraska, Lincoln, Nebraska 68588-0111 (United States)

The cross sections for resonant two-color, two-photon detachment of H[sup [minus]] with excitation of the degenerate H(2[ital s]) and H(2[ital p]) levels are calculated within a semiempirical adiabatic hyperspherical representation. The first photon, with energy [omega][sub 1]=0.4017 a.u., is resonant with the well-known Feshback [sup 1][ital P[ital o]] resonance below the H([ital n]=2) threshold. The second photon, with energy [omega][sub 2][ge]0.126 05 a.u., scans the energy region above the H([ital n]=2) threshold over which long-range dipole-field-induced cross-section oscillations are predicted to occur. Such Gailitis-Damburg oscillations have not yet been observed experimentally. Results for various pairs of light polarization for the two photons are presented. Our resonant two-color, two-photon detachment cross sections are 8--9 orders of magnitude greater than the corresponding nonresonant, single-color, two-photon detachment cross sections obtained by Liu, Du, and Starace [Phys. Rev. A 43, 5891 (1991)]. Unmistakable evidence of long-range dipole-field effects is presented over the 5-meV energy range above the H([ital n]=2) threshold. Furthermore, the differential cross sections for right- and left-circularly polarized, copropagating photons and especially the circular dichroism differential cross sections are shown to have nearly a full cycle of a greatly enhanced dipole-field-induced oscillation extending over the region from threshold to [approx]34 meV above.

• DOE Contract Number: FG02-88ER13955
• OSTI ID: 6214902
• Journal Information: Physical Review A; (United States), Journal Name: Physical Review A; (United States) Vol. 48:3; ISSN 1050-2947; ISSN PLRAAN
• 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
AUGMENTATION
CHARGED PARTICLES
COLOR
CROSS SECTIONS
ELEMENTS
ENERGY-LEVEL TRANSITIONS
EXCITATION
HYDROGEN
HYDROGEN IONS
HYDROGEN IONS 1 MINUS
IONIZATION
IONS
MULTI-PHOTON PROCESSES
NONMETALS
OPTICAL PROPERTIES
ORGANOLEPTIC PROPERTIES
PHOTOIONIZATION
PHYSICAL PROPERTIES
RESONANCE