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Full-Text Articles in Physical Sciences and Mathematics
Target Dependence Of Angular Distributions For Near-Threshold (E,2E) Processes, Cheng Pan, Anthony F. Starace
Target Dependence Of Angular Distributions For Near-Threshold (E,2E) Processes, Cheng Pan, Anthony F. Starace
Anthony F. Starace Publications
Distorted-wave calculations of the triply differential cross sections for electron-impact ionization of H and He targets are presented for final-state electrons sharing 4-eV excess energy and leaving in opposite directions. The experimentally observed target dependence of the angular distributions is shown to stem essentially from short-range effects on the s-wave phase shifts of both incident and final-state continuum electrons.
Angular Distribution Of Electrons Following Two-Photon Ionization Of The Ar Atom And Two-Photon Detachment Of The F- Ion, Cheng Pan, Anthony F. Starace
Angular Distribution Of Electrons Following Two-Photon Ionization Of The Ar Atom And Two-Photon Detachment Of The F- Ion, Cheng Pan, Anthony F. Starace
Anthony F. Starace Publications
Angular-distribution asymmetry parameters for photoelectrons produced by two-photon ionization of the Ar atom and two-photon detachment of the F- ion are calculated for photon energies below the thresholds for single-photon ionization and single-photon detachment, respectively. Effects of electron correlations are included by perturbative methods. Good agreement is obtained between our results and those of a recent experimental angular-distribution measurement of two-photon detachment of the F- ion at λ=532 nm [C. Blondel, M. Crance, C. Delsart, and A. Giraud (unpublished)].
One- And Two-Photon Detachment Of H- With Excitation Of H(N=2), Chih-Ray Liu, Ning-Yu Du, Anthony F. Starace
One- And Two-Photon Detachment Of H- With Excitation Of H(N=2), Chih-Ray Liu, Ning-Yu Du, Anthony F. Starace
Anthony F. Starace Publications
The cross sections for one- and two-photon detachment of H- with excitation of the degenerate H(2s) and H(2p) levels are calculated within an adiabatic hyperspherical representation. Both the partial cross sections, σ(2s) and σ(2s), and the photoelectron angular distribution asymmetry parameters are obtained. Our one-photon detachment results are dominated by the 1P0 shape resonance feature above threshold, which is well known from prior theoretical and experimental work, with which our results are compared in detail. Our two-photon detachment cross sections and angular distribution asymmetry parameters exhibit a half-cycle of dipole-field-induced …
Long-Range Dipole Field Effects On H– Detachment Processes Above The H(N=2) Threshold, Anthony F. Starace
Long-Range Dipole Field Effects On H– Detachment Processes Above The H(N=2) Threshold, Anthony F. Starace
Anthony F. Starace Publications
The long-range dipole field interaction between a low energy electron and the hydrogen atom in the n = 2 state is shown to be the key for understanding significant features of a number of H– detachment processes. Collisional, single photon, and two-photon detachment processes are examined, each of which is shown to be sensitive to different aspects of low-energy H(n=2)–e– interactions. Specifically, these detachment processes are best suited respectively for exhibiting the finite threshold cross sections for certain 1Se, 1P0, and 1De final-state channels, the shape resonance in one of …