Commissioning of a powerful electron gun for electron–ion crossed-beams experiments

Ebinger, B.; Borovik, A.; Molkentin, T.; Müller, Alfred; Schippers, S.

doi:10.1016/j.nimb.2017.03.136

Cited by 4 publications

(5 citation statements)

References 12 publications

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“…Employing the electron-ion crossed-beams technique new experimental cross sections for electron-impact single-ionization (EISI) of Xe 12+ and Xe 13+ as well as for electron-impact double-ionization (EIDI) of Xe 12+ , Xe 13+ , and Xe 14+ were measured. A recently installed new electron gun [18][19][20] allowed us to extend the collision energy range from previously up to 1000 eV to now up to 3500 eV. The agreement of the new EISI data with our previously measured cross sections [10,11] testifies that the new gun operates as intended.…”

Section: Discussionsupporting

confidence: 58%

“…The electron beam was provided by an electron gun which is different from the gun used in our earlier work [10,11]. In particular, the new gun extends the available electron-energy range from previously maximally 1000 eV to now 3500 eV [18][19][20]. The electron gun produces a ribbon-shaped electron beam with currents of up to 900 mA at the maximum energy.…”

Section: Experimental Approachmentioning

confidence: 99%

“…The electron gun produces a ribbon-shaped electron beam with currents of up to 900 mA at the maximum energy. For a specific measurement, however, the electron current depends on the electron energy and the selected operation mode of the electron gun [19].…”

Section: Experimental Approachmentioning

confidence: 99%

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Experimental and theoretical total cross sections for single and double ionization of the open-4d-shell ions Xe$$^{12+}$$, Xe$$^{13+}$$, and Xe$$^{14+}$$ by electron impact

Jin,

Borovik,

Döhring

et al. 2024

Eur. Phys. J. D

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We present new experimental and theoretical cross sections for electron-impact single ionization of Xe$$^{12+}$$ 12 + and Xe$$^{13+}$$ 13 + ions, and double ionization of Xe$$^{12+}$$ 12 + , Xe$$^{13+}$$ 13 + and Xe$$^{14+}$$ 14 + ions for collision energies from the respective ionization thresholds up to 3500 eV. The calculations use the fully relativistic subconfiguration-averaged distorted-wave approach and, partly, the more detailed level-to-level distorted wave method. We find that, unlike in previous work, our theoretical cross sections agree with our experimental ones within the experimental uncertainties, except for the near-threshold double-ionization cross sections. We attribute this remaining discrepancy to the neglect of direct-double ionization in the present theoretical treatment. Graphical abstract Experimental and theoretical cross sections for electron-impact single ionization of Xe$$^{12+}$$ 12 + .

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Section: Discussionsupporting

confidence: 58%

Section: Experimental Approachmentioning

confidence: 99%

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Experimental and theoretical total cross sections for single and double ionization of the open-4d-shell ions Xe$$^{12+}$$, Xe$$^{13+}$$, and Xe$$^{14+}$$ by electron impact

Jin,

Borovik,

Döhring

et al. 2024

Eur. Phys. J. D

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“…The accuracy of the present experimentally-derived EISI rate coefficients is also limited by the fact that the experimental electron-ion collision energy was constrained to a maximum value of 1000eV. In order to improve on this constraint, a new electron gun has recently been put into operation at the Giessen electron-ion crossed-beams setup which extents the accessible energy range to 3500eV [47]. This new electron gun would also facilitate an extension of the present study to tungsten ions with charge states higher than 19.…”

Section: Discussionmentioning

confidence: 99%

Electron-impact single ionisation of W^q+ions: experiment and theory for 11 ≤ q ≤ 18

Schury

Borovik

Ebinger

et al. 2019

J. Phys. B: At. Mol. Opt. Phys.

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Absolute cross sections for electron-impact single ionisation (EISI) of multiply charged tungsten ions (W q+ ) with charge states in the range 11 ≤ q ≤ 18 in the electron-ion collision energy ranges from below the respective ionisation thresholds up to 1000 eV were measured employing the electron-ion crossed-beams method. In order to extend the results to higher energies, cross section calculations were performed using the subconfiguration-averaged distorted-wave (SCADW) method for electron-ion collision energies up to 150 keV. From the combined experimental and scaled theoretical cross sections rate coefficients were derived which are compared with the ones contained in the ADAS database and which are based on the configuration-averaged distorted wave (CADW) calculations of Loch et al. [Phys. Rev. A 72, 052716 (2005)]. Significant discrepancies were found at the temperatures where the ions investigated here are expected to form in collisionally ionised plasmas. These discrepancies are attributed to the limitations of the CADW approach and also the more detailed SCADW treatment which do not allow for a sufficiently accurate description of the EISI cross sections particularly at the ionisation thresholds.

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“…The last advance that we touch on relates to measurements of EIMI for dynamic and out-of-equilibrium atomic plasmas. Recent advances in electron gun development for ionization studies using electron-ion crossed-beams configurations now enable measurement at collision energies up to 3500 eV [169]. Measurements on this apparatus will help to reduce the uncertainties in the existing EIMI database pointed out by [164].…”

Section: Applications 16 Electronic Collisions With Atoms and Molecul...mentioning

confidence: 99%

Roadmap on photonic, electronic and atomic collision physics: II. Electron and antimatter interactions

Schippers

Sokell

Aumayr

et al. 2019

J. Phys. B: At. Mol. Opt. Phys.

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We publish three Roadmaps on photonic, electronic and atomic collision physics in order to celebrate the 60th anniversary of the ICPEAC conference. In Roadmap II we focus on electron and antimatter interactions. Modern theoretical and experimental approaches provide detailed insight into the many body quantum dynamics of leptonic collisions with targets of varying complexity ranging from neutral and charged atoms to large biomolecules and clusters. These developments have been driven by technological progress and by the needs of adjacent areas of science such as astrophysics, plasma physics and radiation biophysics. This Roadmap aims at looking back along the road, explaining the evolution of the field, and looking forward, collecting contributions from eighteen leading groups from the field.

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Commissioning of a powerful electron gun for electron–ion crossed-beams experiments

Cited by 4 publications

References 12 publications

Experimental and theoretical total cross sections for single and double ionization of the open-4d-shell ions Xe$$^{12+}$$, Xe$$^{13+}$$, and Xe$$^{14+}$$ by electron impact

Experimental and theoretical total cross sections for single and double ionization of the open-4d-shell ions Xe$$^{12+}$$, Xe$$^{13+}$$, and Xe$$^{14+}$$ by electron impact

Electron-impact single ionisation of W^q+ions: experiment and theory for 11 ≤ q ≤ 18

Roadmap on photonic, electronic and atomic collision physics: II. Electron and antimatter interactions

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Commissioning of a powerful electron gun for electron–ion crossed-beams experiments

Cited by 4 publications

References 12 publications

Experimental and theoretical total cross sections for single and double ionization of the open-4d-shell ions Xe$$^{12+}$$, Xe$$^{13+}$$, and Xe$$^{14+}$$ by electron impact

Experimental and theoretical total cross sections for single and double ionization of the open-4d-shell ions Xe$$^{12+}$$, Xe$$^{13+}$$, and Xe$$^{14+}$$ by electron impact

Electron-impact single ionisation of W q+ions: experiment and theory for 11 ≤ q ≤ 18

Roadmap on photonic, electronic and atomic collision physics: II. Electron and antimatter interactions

Contact Info

Product

Resources

About

Electron-impact single ionisation of W^q+ions: experiment and theory for 11 ≤ q ≤ 18