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  Resonance-enhanced multiple ionization of krypton at an X-ray free-electron laser.

Rudek, B., Rolles, D., Son, S. K., Foucar, L., Erk, B., Epp, S., et al. (2013). Resonance-enhanced multiple ionization of krypton at an X-ray free-electron laser. Physical Review A, 87(2): 023413. doi:10.1103/PhysRevA.87.023413.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-B9A7-2 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-BA1F-C
Genre: Journal Article

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Rudek, B., Author
Rolles, D., Author
Son, S. K., Author
Foucar, L., Author
Erk, B., Author
Epp, S., Author
Boll, R.1, Author              
Anielski, D., Author
Bostedt, C., Author
Schorb, S., Author
Coffee, R., Author
Bozek, J., Author
Trippel, S., Author
Marchenko, T., Author
Simon, M., Author
Christensen, L., Author
Sankar De, S. W., Author
Ueda, K., Author
Schlichting, I., Author
Santra, R., Author
Ullrich, J., AuthorRudenko, A., Author more..
Affiliations:
1Research Group of Structural Dynamics of (Bio)Chemical Systems, MPI for Biophysical Chemistry, Max Planck Society, ou_578564              

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 Abstract: The sequential inner-shell multiple ionization of krypton was investigated at the Linac Coherent Light Source using ion time-of-flight spectroscopy at photon energies above (2 keV) and below (1.5 keV) the L edge with two x-ray pulse lengths (5 and 80 fs, nominally) and various pulse energies. At 2.5 mJ pulse energy, charge states up to Kr17+ were recorded for M-shell ionization and charge states up to Kr21+ for L-shell ionization. Comparing the experimental charge state distribution to Monte Carlo rate-equation calculations, we find a strong enhancement of higher charge states at 2 keV photon energy as compared to the theoretical predictions. This enhancement is explained with a resonant ionization pathway where multiple excitations into outer valence and Rydberg orbitals are followed by autoionization. These resonant pathways play an important role for the photoionization of ions with charge higher than Kr12+, for which direct one-photon L-shell photoionization is energetically impossible at 2 keV photon energy. Only a small pulse-length dependence of the charge state yield is observed at an x-ray pulse energy of 0.4 mJ.

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Language(s): eng - English
 Dates: 2013-02-192013-02
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: DOI: 10.1103/PhysRevA.87.023413
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Title: Physical Review A
Source Genre: Journal
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Pages: 8 Volume / Issue: 87 (2) Sequence Number: 023413 Start / End Page: - Identifier: -