Ionization of helium and molecular hydrogen by slow antiprotons

P. Hvefplund; H. Knudsen; U. Mikkelsen; E. Morenzoni; S. P. M0ller; E. Uggerh0j; T. Worm

doi:10.1088/0953-4075/27/5/012

Ionization of helium and molecular hydrogen by slow antiprotons

P. Hvefplund, H. Knudsen, U. Mikkelsen, E. Morenzoni, S. P. M0ller, E. Uggerh0j, T. Worm

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avis › Tidsskriftartikel › Forskning › peer review

133 Citationer (Scopus)

Abstract

Measurements of the cross sections for single and double ionization or helium as well as for the creation of H⁺₂ and H⁺ ions from H₂ for impact of antiprotons in the energy range 13-500 keV are presented. The results are compared with our earlier, less accurate data and with data for equivelocity proton impact. The single ionization cross section of helium agrees remarkably well with a continuum distorted wave (CDW-EIS) calculation. The ratio between the double and the single ionization cross sections of helium increases dramatically with decreasing projectile energy. New theoretical calculations are called for.

Originalsprog	Engelsk
Tidsskrift	Journal of Physics B: Atomic, Molecular and Optical Physics
Vol/bind	27
Nummer	5
Sider (fra-til)	925-934
Antal sider	10
ISSN	0953-4075
DOI	https://doi.org/10.1088/0953-4075/27/5/012
Status	Udgivet - 14 mar. 1994

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T1 - Ionization of helium and molecular hydrogen by slow antiprotons

AU - Hvefplund, P.

AU - Knudsen, H.

AU - Mikkelsen, U.

AU - Morenzoni, E.

AU - M0ller, S. P.

AU - Uggerh0j, E.

AU - Worm, T.

PY - 1994/3/14

Y1 - 1994/3/14

N2 - Measurements of the cross sections for single and double ionization or helium as well as for the creation of H+2 and H+ ions from H2 for impact of antiprotons in the energy range 13-500 keV are presented. The results are compared with our earlier, less accurate data and with data for equivelocity proton impact. The single ionization cross section of helium agrees remarkably well with a continuum distorted wave (CDW-EIS) calculation. The ratio between the double and the single ionization cross sections of helium increases dramatically with decreasing projectile energy. New theoretical calculations are called for.

AB - Measurements of the cross sections for single and double ionization or helium as well as for the creation of H+2 and H+ ions from H2 for impact of antiprotons in the energy range 13-500 keV are presented. The results are compared with our earlier, less accurate data and with data for equivelocity proton impact. The single ionization cross section of helium agrees remarkably well with a continuum distorted wave (CDW-EIS) calculation. The ratio between the double and the single ionization cross sections of helium increases dramatically with decreasing projectile energy. New theoretical calculations are called for.

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JO - Journal of Physics B: Atomic, Molecular and Optical Physics

JF - Journal of Physics B: Atomic, Molecular and Optical Physics

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Ionization of helium and molecular hydrogen by slow antiprotons

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