Single ionization of helium by 102 eV electron impact: three-dimensional images for electron emission

Dürr, M.; Dimopoulou, Christina; Dorn, Alexander; Najjari, B.; Bray, Igor; Fursa, Dmitry V.; Chen, Zhangjin; Madison, Don H.; Bartschat, Klaus; Ullrich, J.

doi:10.1088/0953-4075/39/20/008

Cited by 66 publications

(54 citation statements)

References 45 publications

(84 reference statements)

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“…We furthermore find that the minimum between recoil and binary peak is similarly pronounced for all combinations of q and E e (not shown); only the ratios between binary and recoil peak vary, as well known from (e,2e) experiments [36,37]. Figure 3(b) shows the angular distribution in the azimuthal plane, marked by region A in Fig.…”

Section: Resultssupporting

confidence: 74%

Agreement of Experiment and Theory on the Single Ionization of Helium by Fast Proton Impact

et al. 2016

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Even though ion/atom-collision is a mature field of atomic physics great discrepancies between experiment and theoretical calculations are still common. Here we present experimental results with highest momentum resolution on single ionization of helium induced by 1 MeV protons and compare these to different theoretical calculations. The overall agreement is strikingly good and already the first Born approximation yields good agreement between theory and experiment. This has been expected since several decades, but so far has not been accomplished. The influence of projectile coherence effects on the measured data is shortly discussed in line with an ongoing dispute on the existence of nodal structures in the electron angular emission distributions.

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Section: Resultssupporting

confidence: 74%

Agreement of Experiment and Theory on the Single Ionization of Helium by Fast Proton Impact

et al. 2016

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“…Details of the experimental setup and the procedure were described elsewhere [19,26]. Briefly, a well-focused (1 mm), pulsed electron beam (pulse length ≈ 1.5 ns, repetition rate 180 kHz, ≈10 4 electrons/pulse), generated by a standard thermocathode gun, crosses an argon gas jet (1 mm diameter, 10 12 atoms/cm 3 ), which is produced in a three-stage supersonic gas expansion.…”

Section: Methodsmentioning

confidence: 99%

Low-energy electron-impact ionization of argon: Three-dimensional cross section

et al. 2012

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Low-energy (E 0 = 70.8 eV) electron impact single ionization of a 3p electron in argon has been studied experimentally and theoretically. Our measurements are performed using the socalled Reaction Microscope technique, which can cover nearly a full 4π solid angle for the emission of a secondary electron with energy below 15 eV and projectile scattering angles ranging from −8° to −30°. The measured cross sections are inter-normalized across all scattering angles and ejected energies. Several theoretical models were employed to predict the triple-differential cross sections. They include a standard distorted-wave Born approximation (DWBA), a modified version to account for the effects of post-collision interaction (DWBA-PCI), a hybrid second-order distortedwave plus R-matrix (DWB2-RM) method, and the recently developed B-spline R-matrix with pseudo-states (BSR) approach. The relative angular dependence of the BSR cross sections is generally found to be in reasonable agreement with experiment, and the importance of the PCI effect is clearly visible in this low-energy electron impact ionization process. However, there remain significant differences in the magnitude of the calculated and the measured TDCSs.

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“…Details of the experimental setup and the procedure were described elsewhere [23], [25]. Very briefly, a pulsed electron beam crosses an argon supersonic gas jet and causes the ionization of one bound electron from the target.…”

Section: Methodsmentioning

confidence: 99%

Benchmark experiment for electron-impact ionization of argon: Absolute triple-differential cross sections via three-dimensional electron emission images

et al. 2011

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Single ionization of argon by 195-eV electron impact is studied in an experiment, where the absolute tripledifferential cross sections are presented as three-dimensional electron emission images for a series of kinematic conditions. Thereby a comprehensive set of experimental data for electron-impact ionization of a many-electron system is produced to provide a benchmark for comparison with theoretical predictions. Theoretical models using a hybrid first-order and second-order distorted-wave Born plus R-matrix approach are employed to compare their predictions with the experimental data. While the relative shape of the calculated cross section is generally in reasonable agreement with experiment, the magnitude appears to be the most significant problem with the theoretical treatment for the conditions studied in the present work. This suggests that the most significant challenge in the further development of theory for this process may lie in the reproduction of the absolute scale rather than the angular dependence of the cross section.

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Single ionization of helium by 102 eV electron impact: three-dimensional images for electron emission

Cited by 66 publications

References 45 publications

Agreement of Experiment and Theory on the Single Ionization of Helium by Fast Proton Impact

Agreement of Experiment and Theory on the Single Ionization of Helium by Fast Proton Impact

Low-energy electron-impact ionization of argon: Three-dimensional cross section

Benchmark experiment for electron-impact ionization of argon: Absolute triple-differential cross sections via three-dimensional electron emission images

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