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Variationally Stable Treatment Of Two- And Three-Photon Detachment Of H- Including Electron-Correlation Effects, Chih-Ray Liu, Bo Gao, Anthony F. Starace
Variationally Stable Treatment Of Two- And Three-Photon Detachment Of H- Including Electron-Correlation Effects, Chih-Ray Liu, Bo Gao, Anthony F. Starace
Anthony F. Starace Publications
A variationally stable, adiabatic hyperspherical treatment of two- and three-photon detachment of H- is presented. Results are compared with analytic predictions of a zero-range potential model of H-. Detailed comparisions are made also with other theoretical results which include the effects of electron correlations. We predict analytically (and demonstrate numerically) an extreme sensitivity of the theoretical predictions to any errors in the value of the electron affinity employed. In an Appendix we show that the low-intensity limit of the Keldysh treatment [Sov. Phys. JETP 20, 1307 (1965)] of detachment of an electron bound in a zero-range …
Angular Distributions For Near-Threshold (E,2E) Processes For H, He, And Other Rare-Gas Targets , Cheng Pan, Anthony F. Starace
Angular Distributions For Near-Threshold (E,2E) Processes For H, He, And Other Rare-Gas Targets , Cheng Pan, Anthony F. Starace
Anthony F. Starace Publications
Distorted-wave calculations of the triply differential cross sections for electron-impact ionization of H, He, Ne, Ar, Kr, and Xe are presented for final-state electrons sharing ≤4 eV excess energy and for the coplanar, θ12=π geometry. Results for H and He targets, presented briefly elsewhere [C. Pan and A. F. Starace, Phys. Rev. Lett. 67, 185 (1991)], are analyzed in greater detail and compared with available experimental and other theoretical results. In particular, for He targets the effects of exchange and of second-order capture processes are exhibited. These are shown to be of lesser importance than other short-range effects …
Hyperspherical Coordinate Description Of Single- And Multiphoton Processes In Two-Electron Systems, Anthony F. Starace
Hyperspherical Coordinate Description Of Single- And Multiphoton Processes In Two-Electron Systems, Anthony F. Starace
Anthony F. Starace Publications
The purpose of this chapter is to review the use of the adiabatic hyperspherical approximation for the quantitative calculation of single- and multiphoton cross sections of two-electron systems. In Section 2 we provide a brief general orientation to the hyperspherical coordinate representation, the adiabatic approximation, and a diabatic approximation for treating strongly avoided crossings between adiabatic potential curves. In Section 3 we review applications to photoionization and photodetachment processes in He, Be, H–, and Ps–. In Section 4 we review applications to multiphoton processes in H–. Finally, in Section 5 we assess the adiabatic …