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Collisions between metastable hydrogen atoms at thermal energies
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical and Analytical Chemistry, Quantum Chemistry.
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2000 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 85, no 20, 4245-4248 p.Article in journal (Refereed) Published
Abstract [en]

The complex interaction potentials arising in the approach of two metastable hydrogen 2s atoms are calculated and the cross sections for ionization, excitation transfer, and elastic scattering are predicted. The measured cross section for associative ionization at E = 4.1 meV equals 2×10-15 cm2. We calculate a total ionization cross section of 2×10-13 cm2, varying as E-2/3 at higher energies. Thus it appears that dissociative ionization is the major ionization channel. We find also that double excitation transfer into two excited H(2p) atoms is still more probable with the large cross section of 9×10-12 cm2 at E = 4.1 meV varying as E-1/2 at higher energies. The detection of the resulting Lyman alpha photons would provide a diagnostic test of our predictions.

Place, publisher, year, edition, pages
2000. Vol. 85, no 20, 4245-4248 p.
Keyword [en]
Cross-sections, Molecules
National Category
Natural Sciences
URN: urn:nbn:se:uu:diva-36848DOI: 10.1103/PhysRevLett.85.4245OAI: oai:DiVA.org:uu-36848DiVA: diva2:64747
Addresses: Forrey RC, Penn State Univ, Berks Lehigh Valley Coll, Reading, PA 19610 USA. Penn State Univ, Berks Lehigh Valley Coll, Reading, PA 19610 USA. Univ Connecticut, Dept Phys, Storrs, CT 06269 USA. Harvard Smithsonian Ctr Astrophys, Cambridge, MA 0Available from: 2007-02-14 Created: 2007-02-14 Last updated: 2011-12-01Bibliographically approved

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Publisher's full texthttp://link.aps.org/doi/10.1103/PhysRevLett.85.4245

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