Intense X-ray FEL-molecule physics: Highly charged ions

Journal Article · Fri May 25 00:00:00 EDT 2012 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4707886· OSTI ID:22004071

Murphy, B F; Fang, L; Osipov, T Y; Hoener, M; Berrah, N ^[1]

---

1. Western Michigan University, Physics Department, 1903 W. Michigan Avenue, Kalamazoo, MI, 49008 (United States)

We report on sequential multiphoton ionization of N{sub 2}, H{sub 2}S and SF{sub 6} by intense, femtosecond duration pulses of x-rays from the LCLS free electron laser. Following either K- or L-shell excitation, we observe ionization and fragmentation of the molecule by Auger electron, photoelectron, and ion time-of-flight spectroscopy. Intense excitation of the K-shell leads to depletion and double core hole effects, observed in N{sub 2}. For L-shell excitation, additional relaxation channels suppress depletion, allowing ionization to continue until energetically forbidden. The investigation of multiphoton ionization has produced a better understanding of molecular plasmas created by intense ultrafast x-ray exposure.

• OSTI ID: 22004071
• Journal Information: AIP Conference Proceedings, Vol. 1438, Issue 1; Conference: 17. international conference on atomic processes in plasmas (ICAPIP), Belfast, Northern Ireland (United Kingdom), 19-22 Jul 2011; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
AUGER ELECTRON SPECTROSCOPY
ELECTRONS
EXCITATION
FREE ELECTRON LASERS
HYDROGEN COMPOUNDS
K SHELL
L SHELL
LIGHT TRANSMISSION
MOLECULES
MULTICHARGED IONS
MULTI-PHOTON PROCESSES
NITROGEN
PHOTOELECTRON SPECTROSCOPY
PHOTOIONIZATION
RELAXATION
SULFUR FLUORIDES
TIME-OF-FLIGHT METHOD
X RADIATION