Academic Commons

Articles

Electron capture by Ne4+ ions from atomic hydrogen

Savin, Daniel Wolf; Havener, C. C.; Rejoub, R.; Vane, C. R.; Krause, H. F.; Schnell, M.; Wang, J. G.; Stancil, P. C.

Using the Oak Ridge National Laboratory ion-atom merged-beams apparatus, the absolute total electron-capture cross section has been measured for collisions of Ne4+ with hydrogen and deuterium at relative energies in the center-of-mass frame between 0.10 and 1006 eV/u. Comparison with previous measurements shows large discrepancies between 80 and 600 eV/u. For energies below ∼1 eV∕u, a sharply increasing cross section is attributed to the ion-induced dipole attraction between the reactants. Multichannel Landau-Zener calculations are performed between 0.01 and 5000 eV/u and compare well to the measured total cross sections. Below ∼5 eV∕u, the present total cross section calculations show a significant target isotope effect. At 0.01 eV/u, the H:D total cross section ratio is predicted to be ∼1.4 where capture is dominated by transitions into the Ne3+ (2s22p23d) configuration.

Files

Also Published In

Title
Physical Review A
DOI
https://doi.org/10.1103/PhysRevA.71.034702

More About This Work

Academic Units
Astronomy and Astrophysics
Published Here
March 27, 2013
Academic Commons provides global access to research and scholarship produced at Columbia University, Barnard College, Teachers College, Union Theological Seminary and Jewish Theological Seminary. Academic Commons is managed by the Columbia University Libraries.