Double-to-single target ionization ratio for electron capture in fast p-He collisions

作者：Schmidt HT^*; Fardi A; Schuch R; Schwartz SH; Zettergren H; Cederquist H; Bagge L; Danared H; Kallberg A; Jensen J; Rensfelt KG; Mergel V; Schmidt L; Schmidt Bocking H; Cocke CL

来源：Physical Review Letters, 2002, 89(16): 163201.

DOI：10.1103/PhysRevLett.89.163201

We have used the ion storage ring CRYRING and its internal gas-jet target and recoil-ion-momentum spectrometer to measure absolute cross sections for transfer ionization (TI: p+He-->H-0+He2++e(-)) in 2.5-4.5 MeV p-He collisions with separate Thomas (TTI) and kinematic (KTI) TI contributions. The probability for electron emission in kinematical capture decreases with increasing velocity and appears to approach the photoionization shakeoff value (1.63%) [T. Aberg, Phys. Rev. A 2, 1726 (1970)]. The velocity dependence of the TTI cross section is consistent with the theoretically predicted v(-11) scaling [J. S. Briggs and K. Taulbjerg, J. Phys. B 12, 2565 (1979)].

• 出版日期2002-10-14