Ionization of two-electron systems by Compton scattering of a photon

The ratio of cross sections for double to single ionization of helium by high energy photons and charged particles

“…One might conclude that a fast moving beagle could gather one electron in its mouth and, provided it moved at v > > 2 a. u. and treated the rest of the He gently, would probably elicit a value of RB around 1.7%. However, the calculations of Burgdoerfer et al [1994] and Suric et a.l. [1994] predict a high-energy value of Rc for Compton scattering well below either the photoionization limit or that reached so far in differential charged particle experiments.…”

“…Some theorists [Hino et al 1994, Amusia 1994 have suggested that Rc = Rr since the final wavefunctions are similar in the high-energy limit. Others [Burgdoerfer and Andersen 1994;Suric et al 1994] disagree. As in Aberg's generalized shake description described above, Suric et al [1994] have used <I>1 = eik-riq)(r 2 , ... r.ll.f) and predicted for ionization via Compton scattering that,…”

Cold Target Recoil Ion Momentum Spectroscopy

“…Dashed line: Calculation (BBK-type wavefunction) [329]. Dotted line: [330], Full line: BBK-type "nal state [261]. Dashed-dotted line: [261].…”

Ionization-excitation of H-and He by Compton scattering

“…Two-electron transitions in He have been widely studied in recent years both theoretically and experimentally (McGuire 1997, McGuire et al 2000, Surić et al 1994, Dalgarno and Sadeghpour 1992, Samson et al 1993, Bethe and Salpeter 1977, Anderson and Burgdörfer 1993, Hino et al 1994, Bergstrom et al 1995, Wang et al 1996, Spielberger et al 1996, Morgan and Bartlett 1999, Anatoli et al 1998, Qui et al 1997, Meyer et al 1997, Azuma et al 1995, Krässig et al 1999. Theoretical results for ratios of total cross sections for ionization-excitation and for double ionization to cross sections for single ionization have been evaluated for both Compton scattering (McGuire 1997, McGuire et al 2000, Surić et al 1994 and for photoionization (Dalgarno and Sadeghpour 1992) at high photon energies for both He and H − .…”

“…Theoretical results for ratios of total cross sections for ionization-excitation and for double ionization to cross sections for single ionization have been evaluated for both Compton scattering (McGuire 1997, McGuire et al 2000, Surić et al 1994 and for photoionization (Dalgarno and Sadeghpour 1992) at high photon energies for both He and H − . In a recent paper (McGuire et al 2000) we presented total cross sections for ionization with the final state of the second electron specified in n = 1 and 2 for Compton scattering in H − and He.…”