H/2s/ formation in H/+/-H and H-H collisions

Details H/2s/ formation in H/+/-H and H-H collisions H/2s/ formation in H/+/-H and H-H collisions

Oct 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980phrva..22.1460m&link_type=abstract

Physical Review A - General Physics, 3rd Series, vol. 22, Oct. 1980, p. 1460-1466.

Physics

Atomic Physics

42

Atomic Collisions, Atomic Physics, Hydrogen Atoms, Ion Atom Interactions, Metastable Atoms, Scattering Cross Sections, Electron Capture, Hydrogen Ions, Metastable State

Scientific paper

Cross sections for the formation of metastable H(2s) by electron capture in H(+)-H(1s) collisions and by excitation in H(1s)-H(1s) collisions are measured in the energy range 1.9-92 keV in order to serve as a test of various scattering theories. A fast beam of H(+) ions or H(1s) atoms was passed through a tungsten-tube-furnace target which contained thermally dissociated hydrogen, and fast H(2s) atoms formed by collisions in the target were detected downstream by electric field quenching and Lyman alpha photon-counting techniques. The measured cross sections for the H(+)-H collisions are found to be in good agreement with the multi-state molecular calculations of Chidichimo-Frank and Piacentini (1974) at low energies, with the Born approximation at energies greater than 75 keV, and with the high-energy coupled-state calculations using a scaled hydrogenic two-center expansion of Shakeshaft (1978). Results for H-H collisions are shown to be in poor accord with all theoretical predictions, although the inverse impact energy dependence above 40 keV is in agreement with high-energy theory. Discrepancies are also noted between the present results and previous measurements.

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