Research Papers in Physics and Astronomy


Date of this Version

March 1991


Invited talk presented at the Third US.-Mexico Atomic and Molecular Physics Symposium, Cocoyoc, Mexico, 13–16 March 1991. Published in in Atomic and Molecular Physics: Third US/Mexico Symposium, Morelos, Mexico, 13–16 March 1991, edited by C. Cisneros, T. J. Morgan, and I. Alvarez (World Scientific, Singapore, 1991), pp 359–378. Copyright © 1991 World Scientific Publishing Co. Used by permission.


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 the 1P0 final state channels, and the near-threshold Galitis-Damburg oscillations in certain 1Se and 1De final state channels. The latter oscillations have yet to be observed experimentally in any process.

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