Publications

2019

  • Schury, Daniel ; Jr, Alexander Borovik ; Ebinger, Benjamin Janosch ; Jin, Fengtao ; Spruck, Kaija ; Muller, Alfred ; Schippers, Stefan: Electron-impact single ionisation of W^q+ ions: Experiment and theory for 11 ≤ q ≤ 18. In: J. Phys. B: At., Mol. Opt. Phys., IOP Publishing (2019)
    @article{Schury2019b,
      author = {Schury, Daniel and Jr, Alexander Borovik and Ebinger, Benjamin Janosch and Jin, Fengtao and Spruck, Kaija and Muller, Alfred and Schippers, Stefan},
      title = {Electron-impact single ionisation of W^{q+} ions: Experiment and theory for 11 ≤ q ≤ 18},
      journal = {J. Phys. B: At., Mol. Opt. Phys.},
      year = {2019},
      month = oct,
      doi = {10.1088/1361-6455/ab51e9},
      owner = {daniel},
      publisher = {{IOP} Publishing},
      timestamp = {2019.10.29}
    }
    
  • Schury, Daniel ; Kumar, Ajit ; Méry, Alain ; Chesnel, Jean-Yves ; Lévy, Anna ; Macé, Stéphane ; Prigent, Christophe ; Ramillon, Jean-Marc ; et al.: An electrostatic in-line charge-state purification system for multicharged ions in the kiloelectronvolt energy range. In: Rev. Sci. Instrum. vols. 90, AIP Publishing (2019), Nr. 8, p. 083306

    The performance of a newly built omega type electrostatic analyzer designed to act as an in-line charge-state purification system for ions in the kiloelectronvolt energy range is reported. The analyzer consists of a set of four consecutive electrostatic 140° concentric cylindrical electrodes enclosed by Matsuda electrodes. This setup was recently tested and validated using O 5+ , Ar 9+ , and Xe 20+ ion beams at an energy of 14 qkeV at the ARIBE facility. A resolving power of 10.5 and a transmission of 100% of the desired charge state are measured allowing a good purification of incoming ion beams with charge states up to 10+ and a fairly good purification for charge states at least up to 20+. In comparison with other in-line solutions such as the Wien filter, our system has the advantage of being purely electrostatic and therefore lacking common drawbacks as, for example, hysteresis.

    @article{Schury2019a,
      author = {Schury, Daniel and Kumar, Ajit and M{\'{e}}ry, Alain and Chesnel, Jean-Yves and L{\'{e}}vy, Anna and Mac{\'{e}}, St{\'{e}}phane and Prigent, Christophe and Ramillon, Jean-Marc and Rangama, Jimmy and Rousseau, Patrick and Steydli, S{\'{e}}bastien and Trassinelli, Martino and Vernhet, Dominique and Lamour, Emily},
      title = {An electrostatic in-line charge-state purification system for multicharged ions in the kiloelectronvolt energy range},
      journal = {Rev. Sci. Instrum.},
      year = {2019},
      volume = {90},
      number = {8},
      pages = {083306},
      month = aug,
      doi = {10.1063/1.5093407},
      file = {:Schury2019a.pdf:PDF},
      owner = {daniel},
      publisher = {{AIP} Publishing},
      timestamp = {2019.08.22}
    }
    

2017

  • Schury, Daniel: Aufbau und Charakterisierung einer Quelle spinpolarisierter Elektronen für zukünftige Stoßexperimente mit chiralen Molekülen, Justus-Liebig-Universität Giessen, phdthesis, 2017

    In this work a newly constructed experiment delivering spin-polarized electron beams located at the GSI Helmholtzzentrum für Schwerionenforschung will be described. It will be used at storage ring facilities as well as in small-scale laboratory experiments. The collaboration of a number of hessian universities in the LOEWE excellence cluster ELCH to study the atomic and molecular properties of chiral molecules discovered the lack of a source of spin-polarized electrons in the energy range of a few hundred electronvolts up to several kiloelectronvolts. Currently the setup is able to deliver electron beam intensities up to 50 μA at energies between 100 eV and 10 keV and with a transversal degree of polarization of 25%. Mounted on a compact rack, the setup is ready for use at different experiment places.

                    @phdthesis{Schury2017,
      author = {Schury, Daniel},
      title = {{A}ufbau und {C}harakterisierung einer {Q}uelle spinpolarisierter {E}lektronen für zukünftige {S}toßexperimente mit chiralen {M}olekülen},
      school = {Justus-Liebig-Universität Giessen},
      year = {2017},
      type = {phdthesis},
      month = dec,
      file = {:S/Schury2017.pdf:PDF;:Schury2017.pdf:PDF},
      institution = {Justus-Liebig-Universität Gießen},
      language = {Deutsch},
      pages = {60},
      pagetotal = {120},
      subtitle = {Construction and characterization of a spin-polarized electron source for future experiments with chiral molecules},
      url = {http://geb.uni-giessen.de/geb/volltexte/2017/13417/}
    }
    
  • Gumberidze, A. ; Kozhuharov, C. ; Zhang, R.T. ; Trotsenko, S. ; Kozhedub, Y.S. ; DuBois, R.D. ; Beyer, H.F. ; Blumenhagen, K.-H. ; et al.: Impact parameter sensitive study of inner-shell atomic processes in the experimental storage ring. In: Nucl. Instrum. Methods Phys. Res., Sect. B vols. 408, Elsevier BV (2017), pp. 27–30

    In this work, we present a pilot experiment in the experimental storage ring (ESR) at GSI devoted to impact parameter sensitive studies of inner shell atomic processes for low-energy (heavy-) ion-atom collisions. The experiment was performed with bare and He-like xenon ions (Xe^54+ , Xe$^52+) colliding with neutral xenon gas atoms, resulting in a symmetric collision system. This choice of the projectile charge states was made in order to compare the effect of a filled K-shell with the empty one. The projectile and target X-rays have been measured at different observation angles for all impact parameters as well as for the impact parameter range of 35–70 fm.

                    @article{Gumberidze2017,
      author = {Gumberidze, A. and Kozhuharov, C. and Zhang, R.T. and Trotsenko, S. and Kozhedub, Y.S. and DuBois, R.D. and Beyer, H.F. and Blumenhagen, K.-H. and Brandau, C. and Bräuning-Demian, A. and Chen, W. and Forstner, O. and Gao, B. and Gassner, T. and Grisenti, R.E. and Hagmann, S. and Hillenbrand, P.-M. and Indelicato, P. and Kumar, A. and Lestinsky, M. and Litvinov, Yu. A. and Petridis, N. and Schury, D. and Spillmann, U. and Trageser, C. and Trassinelli, M. and Tu, X. and Stöhlker, Th.},
      title = {Impact parameter sensitive study of inner-shell atomic processes in the experimental storage ring},
      journal = {Nucl. Instrum. Methods Phys. Res., Sect. B},
      year = {2017},
      volume = {408},
      pages = {27--30},
      month = oct,
      issn = {0168-583X},
      doi = {10.1016/j.nimb.2017.04.090},
      file = {Gumberidze2017.pdf:Gumberidze2017.pdf:PDF},
      publisher = {Elsevier {BV}},
      url = {http://www.sciencedirect.com/science/article/pii/S0168583X17305402}
    }
    

2016

  • Borovik, Alexander ; Ebinger, Benjamin ; Schury, Daniel ; Schippers, Stefan ; Müller, Alfred: Electron-impact single ionization of W^19+ ions. In: Phys. Rev. A vols. 93, American Physical Society (APS) (2016), Nr. 1, p. 012708

    Electron-impact single ionization of W^19+ ions has been studied both experimentally and theoretically. By employing the crossed-beams method, absolute cross sections have been measured in the energy range from the ionization onset up to 1000 eV. Theoretical calculations of the ionization-cross-section function were performed using the configuration-averaged distorted-wave method for electron-ion collision energies up to 150 keV. Contributions of excited long-lived primary-ion-beam admixtures were taken into account. The role of different competing ionization mechanisms contributing to the studied cross section is discussed. Plasma rate coefficients have been inferred and are presented in parametrized form.

    @article{Borovik2016,
      author = {Borovik, Alexander and Ebinger, Benjamin and Schury, Daniel and Schippers, Stefan and Müller, Alfred},
      title = {Electron-impact single ionization of W^{19+} ions},
      journal = {Phys. Rev. A},
      year = {2016},
      volume = {93},
      number = {1},
      pages = {012708},
      month = jan,
      issn = {2469-9934},
      doi = {10.1103/physreva.93.012708},
      file = {:Borovik2016.pdf:PDF},
      publisher = {American Physical Society ({APS})},
      url = {http://dx.doi.org/10.1103/PhysRevA.93.012708}
    }
    

2015

  • Borovik, A ; Schury, D ; Ebinger, B ; Spruck, K ; Becker, A ; Gharaibeh, M F ; Rausch, J ; Schippers, S ; et al.: Electron-impact ionization of tungsten ions. In: J. Phys. Conf. Ser. vols. 635, IOP Publishing (2015), Nr. 5, p. 052040

    Electron-impact ionization of tungsten ions has been measured in the energy range from threshold up to 1000 eV. Configuration-averaged distorted wave calculations were used to explain the experimental data.

    @article{Borovik2015,
      author = {Borovik, A and Schury, D and Ebinger, B and Spruck, K and Becker, A and Gharaibeh, M F and Rausch, J and Schippers, S and Müller, A},
      title = {Electron-impact ionization of tungsten ions},
      journal = {J. Phys. Conf. Ser.},
      year = {2015},
      volume = {635},
      number = {5},
      pages = {052040},
      month = sep,
      doi = {10.1088/1742-6596/635/5/052040},
      file = {:Borovik2015.pdf:PDF},
      publisher = {{IOP} Publishing}
    }
    

2014

  • Schippers, S ; Ricz, S ; Buhr, T ; Borovik, A ; Hellhund, J ; Holste, K ; Huber, K ; Schäfer, H-J ; et al.: Absolute cross sections for photoionization of X^q+ ions (1 ≤ q ≤ 5) at the 3d ionization threshold. In: J. Phys. B: At., Mol. Opt. Phys. vols. 47, IOP Publishing (2014), Nr. 11, p. 115602

    The photon-ion merged-beams technique has been employed at the new Photon-Ion spectrometer at PETRA III for measuring multiple photoionization of Xe^q+ (q = 1–5) ions. Total ionization cross sections have been obtained on an absolute scale for the dominant ionization reactions of the type hν + Xe^q+ -> Xe^r+ + (q − r)e^− with product charge states q + 2 ≤r ≤$ q + 5. Prominent ionization features are observed in the photon-energy range 650–750 eV, which are associated with excitation or ionization of an inner-shell 3d electron. Single-configuration Dirac–Fock calculations agree quantitatively with the experimental cross sections for non-resonant photoabsorption, but fail to reproduce all details of the measured ionization resonance structures.

                    @article{Schippers2014,
      author = {Schippers, S and Ricz, S and Buhr, T and Borovik, A and Hellhund, J and Holste, K and Huber, K and Schäfer, H-J and Schury, D and Klumpp, S and Mertens, K and Martins, M and Flesch, R and Ulrich, G and Rühl, E and Jahnke, T and Lower, J and Metz, D and Schmidt, L P H and Schöffler, M and Williams, J B and Glaser, L and Scholz, F and Seltmann, J and Viefhaus, J and Dorn, A and Wolf, A and Ullrich, J and Müller, A},
      title = {Absolute cross sections for photoionization of X^{q+} ions (1 ≤ q ≤ 5) at the 3d ionization threshold},
      journal = {J. Phys. B: At., Mol. Opt. Phys.},
      year = {2014},
      volume = {47},
      number = {11},
      pages = {115602},
      month = may,
      issn = {1361-6455},
      doi = {10.1088/0953-4075/47/11/115602},
      file = {:Schippers_JPB47(2014)115602.pdf:PDF},
      publisher = {{IOP} Publishing},
      url = {http://dx.doi.org/10.1088/0953-4075/47/11/115602}
    }
    
  • Ricz, S ; Schippers, S ; Buhr, T ; Holste, K ; Jr, A Borovik ; Hellhund, J ; Schäfer, H-J ; Schury, D ; et al.: First light on 3d photoionization of multiply charged xenon ions: a new photon-ion merged beam setup at PETRA III. In: J. Phys. Conf. Ser. vols. 488, IOP Publishing (2014), Nr. 14, p. 142006

    A photon-ion merged beam endstation has been set up at the variable polarization XUV-beamline P04 of PETRA III in Hamburg. In a commissioning experiment first results could be obtained for multiple photoionization of Xe^q+ ions (q=1,2,..,5) at photon energies around the 3d ionization threshold.

    @article{Ricz2014,
      author = {Ricz, S and Schippers, S and Buhr, T and Holste, K and Jr, A Borovik and Hellhund, J and Schäfer, H-J and Schury, D and Klumpp, S and Mertens, K and Martins, M and Flesch, R and Ulrich, G and Rühl, E and Lower, J and Jahnke, T and Metz, D and Schmidt, L and Schöffler, M and Williams, J B and Dörner, R and Glaser, L and Scholz, F and Seltmann, J and Viefhaus, J and Dorn, A and Wolf, A and Ullrich, J and Müller, A},
      title = {First light on 3d photoionization of multiply charged xenon ions: a new photon-ion merged beam setup at {PETRA} {III}},
      journal = {J. Phys. Conf. Ser.},
      year = {2014},
      volume = {488},
      number = {14},
      pages = {142006},
      month = apr,
      doi = {10.1088/1742-6596/488/14/142006},
      file = {:Ricz_2014_J._Phys.__Conf._Ser._488_142006.pdf:PDF},
      publisher = {{IOP} Publishing},
      url = {http://stacks.iop.org/1742-6596/488/i=14/a=142006}
    }