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Doubly Differential Detachment Cross Sections For 0.5-Mev H- On He Including Projectile Excitation To H(N=2), Chih-Ray Liu, Anthony F. Starace
Doubly Differential Detachment Cross Sections For 0.5-Mev H- On He Including Projectile Excitation To H(N=2), Chih-Ray Liu, Anthony F. Starace
Anthony F. Starace Publications
Detailed theoretical results are presented for the electron-detachment cross section, doubly differential in both the electron momentum and angle, for the process 0.5-MeV H-+He→H(n=2)+ e-+He*. As discussed briefly elsewhere [C. R. Liu and A. F. Starace, Phys. Rev. Lett. 62, 407 (1989)], the laboratory-frame doubly differential cross sections (DDCS’s) for electron detachment in the forward direction are shown to depend sensitively on the low-energy states of the H(n=2)- e- three-body system. In particular, the angular dependence of characteristic cusp and shape resonance features is presented. We find that the projectile frame …
Variational Principle For High-Order Perturbations With Application To Multiphoton Processes For The H Atom, Bo Gao, Anthony F. Starace
Variational Principle For High-Order Perturbations With Application To Multiphoton Processes For The H Atom, Bo Gao, Anthony F. Starace
Anthony F. Starace Publications
The variationally stable procedure for Nth-order perturbative-transition-matrix elements introduced by the authors [Phys. Rev. Lett. 61, 404 (1988)] is presented here in detail. Its key features are that it is noniterative, involves only two unknown functions regardless of the value of N, is stable even near intermediate-state resonances (due to the presence of energy numerators rather than energy denominators), and uses the inverse of the perturbation operator for N≥3. Explicit formulas are presented for application to high-order multiphoton processes in atomic hydrogen. Numerical results for multiphoton-ionization cross sections (for two, three, and seven photons), for the frequency dependence …
Low-Energy Features Of The E--H(N=2) System Exhibited In Fast H- Detachment Collisions, Chih-Ray Liu, Anthony F. Starace
Low-Energy Features Of The E--H(N=2) System Exhibited In Fast H- Detachment Collisions, Chih-Ray Liu, Anthony F. Starace
Anthony F. Starace Publications
Quantitative predictions for the doubly differential detachment collisions, 0.5-MeV H-+He→H(n=2)+He*+e-, are provided by use of hyperspherical wave functions for the H-e- system. Individual H-e- hyperspherical channels are identified as producing distinct "cusp," "shape resonance," and/or "shoulder" features in the laboratory-frame cross sections. Moreover, the first quantitative predictions of the expected Gailitis-Damburg dipole-field-induced oscillations in the cross sections above the H(n=2) threshold are presented and distinguished from 1P∘ shape resonance effects.