By Benjamin Bederson, Alexander Dalgarno
Advances in Atomic, Molecular, and Optical Physics , demonstrated in 1965, maintains its culture of excellence with quantity 32, released in honor of Founding Editor Sir David Bates upon his retirement as editorof the sequence. This quantity provides stories of themes on the topic of the functions of atomic and molecular physics to atmospheric physics and astrophysics.
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Extra resources for Advances in Atomic, Molecular, and Optical Physics, Vol. 32
The seven-state calculations of Hewitt et al. show that capture into the n = 2 levels is larger than ground state capture for positron energies greater than 7 eV. At lower energies the ground-state capture cross section rises steeply and is dominant. As in the case of positron scattering by lithium, Ps formation has a significant effect on the direct channels, for example, reducing the 3p excitation cross section almost 50% at the cross-section maximum. 1 eV and 1OOOeV. D. ef-He A further target for which coupled channel calculations have been carried out is helium, a case of particular interest in view of the existing experimental measurements of cross sections for excitation of the n = 2 levels and of positronium formation.
E+-He.. . . . . . 111. Perturbation and Distorted Wave Models . A. The CDW and Eikonal Approximations . IV. Conclusion . . . . . . . References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 21 23 25 26 28 29 33 35 35 I. Introduction Positronium formation by positron impact on atoms is an important example of a rearrangement process, which has become of increasing theoretical interest since the development of improved positron sources has made measurement of the formation cross sections possible (Charlton and Laricchia, 1990; Charlton, 1985).
1992), squares. H(C) Ps(Is),where indicates a pseudostate adjusted to give the correct dipole polarizability of atomic hydrogen, and consequently the proper long-range polarization potential in the entrance channel. In further work by Hewitt et al. (1990), the n = 2 positronium states were included in the basis, allowing the importance of capture into the excited states of Ps to be estimated and also allowing partially for polarization in the positronium channels. The cross sections for the formation of Ps(1s) calculated by Hewitt et al.
Advances in Atomic, Molecular, and Optical Physics, Vol. 32 by Benjamin Bederson, Alexander Dalgarno