Electron transfer in keV-energy $sup 4$He$sup ++$ collisions. III. Experimental tests of the close-coupling calculations for $sup 4$He$sup ++$-H(1s) collisions

Journal Article · Mon Sep 01 04:00:00 EDT 1975 · Phys. Rev., A, v. 12, no. 3, pp. 869-875

OSTI ID:4148478

Bayfield, J E; Khayrallah, G A

Two experimental tests of the $sup 4$He$sup ++$-H(1s) close-coupling collision calculations were performed with a highy mass-resolved $sup 4$He$sup ++$ incident ion beam and an atomic hydrogen scattering target. The total single- electron-transfer cross section sigma$sub 21$(H) was measured for $sup 4$He$sup ++$ energies between 7 and 144 keV, with the results in better agreement with molecular-state calculations than with theory employing atomic states. Above 25 keV this cross section is 50% above values obtained Shah and Gilbody for incident $sup 3$He$sup ++$ with the same collision velocity. Also measured was the cross section sigma$sub 21$* (H) for single-electron transfer into the 2s state of He$sup +$ using an ion-photon time-coincidence technique over the $sup 4$He$sup ++$ energy range 7 to 70 keV. These data differ with the corresponding $sup 3$He$sup ++$-H(1s) data of Shah and Gilbody at the higher energies. For sigma$sub 21$* (H), the observed energy dependence as well as the magnitude at the lower energies are in marked disagreement with all close-coupling results.

• Research Organization: J. W. Gibbs Laboratory, Physics Department, Yale University, New Haven, Connecticut 06520
• NSA Number: NSA-33-004084
• OSTI ID: 4148478
• Journal Information: Phys. Rev., A, v. 12, no. 3, pp. 869-875, Journal Name: Phys. Rev., A, v. 12, no. 3, pp. 869-875; ISSN PLRAA
• Country of Publication: United States
• Language: English

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