Showing papers by "Lutz Spielberger published in 1996"
TL;DR: The ratio of double to single ionization of He by 85{endash}400 eV photons has been measured using cold target recoil ion momentum spectroscopy, finding the ratio in this energy range to be about 25% lower than previously assumed.
Abstract: The ratio of double to single ionization of He by 85--400 eV photons has been measured using cold target recoil ion momentum spectroscopy. This technique allows the elimination of all possible systematic errors discussed so far in the literature on this subject. We find the ratio in this energy range to be about 25% lower than previously assumed.
71 citations
TL;DR: In this paper, the authors used a recoil momentum spectroscopy to measure fully differential cross sections for double photoionization of He at energies of 1 ¼ 80 eV above threshold.
Abstract: Recoil momentum spectroscopy has been used to measure fully differential cross sections for double photoionization of He at energies of 1 ‐ 80 eV above threshold. The measurement technique allows the determination of the vector momenta of all three escaping particles, and samples the entire final momentum space. When presented in terms of the momentum vector of the center of mass of the electron pair and the relative momentum of the two electrons, the data reveal simple features of the correlated motion. The resulting patterns near threshold are found to be in agreement with a Wannier description of the process. [S0031-9007(96)00803-4] PACS numbers: 32.80.Fb
69 citations
TL;DR: The ratio of cross sections for double to single ionization of helium by Compton scattering is measured using cold target recoil ion momentum spectroscopy and is in agreement with the asymptotic limits predicted by Andersson and Burgd and Suri.
Abstract: We have measured the ratio of cross sections for double to single ionization of helium by Compton scattering, {ital R}{sub {ital C}}={sigma}{sub {ital C}}{sup ++}/{sigma}{sup +}{sub {ital C}}, at a photon energy of 58 keV using cold target recoil ion momentum spectroscopy. We find a value {ital R}{sub {ital C}}=(0.84{sub {minus}0.11}{sup +0.08}){percent} that is in agreement with the asymptotic limits predicted by Andersson and Burgd{umlt o}rfer [Phys. Rev. A {bold 50}, R2810 (1994)] and Suri{acute c} {ital et} {ital al}.[Phys. Rev. Lett. {bold 73}, 790 (1994)]. {copyright} {ital 1996 The American Physical Society.}
31 citations
TL;DR: In this article, the recoil-ion momentum reflecting the sum momentum of all outgoing electrons was determined for the first time in all three spatial dimensions separately for single and double ionization by electron impact.
Abstract: Using Recoil-Ion Momentum Spectroscopy (RIMS) we have measured the momenta of recoiling target ions in He(e,2e)He+- and He(e,3e)He++-reactions at impact energies between 270 ev and 3200 eV. The recoil-ion momentum reflecting the sum momentum of all outgoing electrons was determined for the first time in all three spatial dimensions separately for single and double ionization by electron impact. The data are compared to results of a nCTMC-calculation.
8 citations
01 Jan 1996
TL;DR: In this paper, the recoil ion momentum reflecting the sum momentum of all out-going electrons was determined for the first time in all three spatial dimensions separately for single and double ionization by electron impact.
Abstract: Using Recoil-Ion Momentum Spectroscopy (RIMS) we have measured the momenta of recoiling tar- get ions in He(e,2e)He +- and He(e,3e)He++-reactions at impact energies between 270 ev and 3200 eV. The recoil- ion momentum reflecting the sum momentum of all out- going electrons was determined for the first time in all three spatial dimensions separately for single and double ionization by electron impact. The data are compared to results of a nCTMC-calculation.