| Zugriffsnummer | 37087 |
| Dokumenttyp | Konferenzartikel |
| Sprache | Englisch |
| Titel | Multiple ionization of Ne+ ions by photoabsorption near the K edge |
| Autor(in); Institution |
Müller, A.; Justus-Liebig-Universität Giessen, Institut für Atom- und Molekülphysik, Giessen, GERMANY
Bernhardt, D.; Justus-Liebig-Universität Giessen, Institut für Atom- und Molekülphysik, Giessen, GERMANY
Borovik, A.; Justus-Liebig-Universität Giessen, Institut für Atom- und Molekülphysik, Giessen, GERMANY; Justus-Liebig-Universität Giessen, I. Physikalisches Institut, Giessen, GERMANY
Buhr, Ticia; 6.5, Strahlenwirkung, PTB-Braunschweig; Justus-Liebig-Universität Giessen, Institut für Atom- und Molekülphysik, Giessen, GERMANY
Hellhund, J.; Justus-Liebig-Universität Giessen, Institut für Atom- und Molekülphysik, Giessen, GERMANY
Holste, K.; Justus-Liebig-Universität Giessen, Institut für Atom- und Molekülphysik, Giessen, GERMANY; Justus-Liebig-Universität Giessen, I. Physikalisches Institut, Giessen, GERMANY
Kilcoyne, A. L. D.; Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California, USA
Klumpp, S.; Universität Hamburg, Institut für Experimentalphysik, Hamburg, GERMANY
Martins, M.; Universität Hamburg, Institut für Experimentalphysik, Hamburg, GERMANY
Ricz, S.; Justus-Liebig-Universität Giessen, Institut für Atom- und Molekülphysik, Giessen, GERMANY; Institute of Nuclear Research of the Hungarian Academy of Sciences, Debrecen, HUNGARY
Viefhaus, J.; FS-PE, DESY, Hamburg, GERMANY
Schippers, S.; Justus-Liebig-Universität Giessen, Institut für Atom- und Molekülphysik, Giessen, GERMANY; Justus-Liebig-Universität Giessen, I. Physikalisches Institut, Giessen, GERMANY
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| Quelle/Jahr | ECAMP 12, 12th European Conference on Atoms, Molecules and Photons: Extended abstracts:(2016), 404 |
| Availability | [Online only] |
| URL | |
| Konferenzangaben | 12th European Conference on Atoms, Molecules and Photons, Frankfurt am Main, 05-09, September, 2016, Germany |
| Freie Schlagworte | Synchrotron radiation ; photoionization and photofragmentation ; interactions of photons with charged particles |
| Zusammenfassung | Single, double and triple photoionization of Ne+ ions by a single photon have been investigated using the photon-ion spectrometer PIPE at the PETRA III synchrotron radiation source in Hamburg. Absolute cross sections were measured employing the photon-ion merged-beams technique. In the course of photon-energy calibration measurements, high-resolution K-shell ionization spectra were also measured for neutral neon by employing an ionization chamber. Natural widths of several prominent lines of neutral Ne and of Ne+ ions including the Ne Ka transitions could be determined with high accuracy. For comparison with existing theoretical calculations photoabsorption cross sections were inferred by summing the measured partial ionization channels. Agreement between theory and experiment is of mixed quality. It is remarkable, though, that the available R-matrix calculations nicely reproduce fine details in the photoabsorption cross section where interference of double excitations with the channel of direct photoionization occurs. The observed resonances in the different final ionization channels reveal the presence of complex Auger-decay mechanisms. The ejection of three electrons from the lowest K-shell-excited Ne+(1s2s22p6 2S1/2) level, for example, requires cooperative interaction of at least four electrons in a single event even if the final charge state is reached via a cascade of Auger decays. The statistical quality, the energy range and the number of channels investigated in the present experiment are unique in the context of K-shell excitation and ionization of ions. Only a previous experiment with C+ ion has provided a similarly comprehensive, high-quality set of absolute cross section data for photon-ion interactions in the energy range around the K edge. |
Zitierung
Müller, A., Bernhardt, D., Borovik, A., Buhr, T., Hellhund, J., Holste, K., Kilcoyne, A. L. D., Klumpp, S., Martins, M., Ricz, S., Viefhaus, J., & Schippers, S. (2016). Multiple ionization of Ne⁺ ions by photoabsorption near the K edge. 12th European Conference on Atoms, Molecules and Photons, Frankfurt am Main, 05-09, September, 2016, Germany.