Single- and double-electron capture in³He²⁺-H₂collisions at low energies from 1 to 2000 eV

Abstract

The total attenuation cross section sigma att and the single-electron capture cross section sigma 21 in collisions of 3He2+ with H2 have been measured using a tandem mass spectrometer whose collision cell consists of an octopole ion beam guide. A possible scattering loss which might contribute to sigma att is examined, and a large part of the difference sigma att- sigma 21 is attributed to the double-electron capture process. As its magnitude is as large as 10-15 cm2 at the lowest energy studied. The importance of the process is emphasized in connection with the production of fast protons through Coulomb explosion of H2+2.

Single- and double-charge-exchange cross sections forArq++H2Kravis1, Saitoh2, Okuno3 et al. 1995Phys. Rev. A254100View full textAdd to dashboardCite

“…Vfe also compare the high-energy end of our results with a scaling formula proposed by Muller and Salzborn [9]. Previous experimental data [10 -13] [3,14,15], so only a brief description of the experimental setup will be given here. Figure 1 shows a schematic diagram of the experimental setup.…”

Measurement of absolute charge-exchange cross sections for He2+collisions with He and H2

“…Data are presented with 2σ error limits. The legend for experimental results is ᭣, Kusakabe et al [39]; ᭟, Figueira da Silva et al [45]; , Shah and Gilbody [46]; ∇, Okuno et al [41];…”

“…Fig. 5 is the energy dependence of σ 21 for He 2+ + He using the gas cells just discussed along with the lower-energy results of Okuno et al [41] and Figueira da Silva et al [42]. The octopole ion-beam guide [41] and double Faraday cup collision-cell arrangements [42] are able to accommodate the larger acceptance angles required at the lower energies.…”

“…Error bars shown are at the 2σ error limit, or 30% [43] for the data of Ref. [41]. Data of the present He-target measurements are listed in Table I.…”

“…The semiclassical close-coupling, traveling atomic orbital (AO) theory of Fritsch [44] displays the correct slope down to its lower limit of 4 keV/amu, but is ∼20% below experimental values. The one-electron diatomic molecule orbitals (OEDM) approach , Kusakabe et al [38], corrected; ᭞, Okuno et al [41]; , Bordenave-Montesquieu and Dagnac [29], integrated; , Berkner et al [37], corrected. The legend for results of theory is , Fritsch [44], close-coupling, traveling AO model;…”