Multiphoton Double Ionization of Ar in Intense Extreme Ultraviolet Laser Fields Studied by Shot-by-Shot Photoelectron Spectroscopy

Journal Article · Fri Sep 24 00:00:00 EDT 2010 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.105.133001· OSTI ID:21466978

Hikosaka, Y ^[1]; Fushitani, M; Hishikawa, A ^[2]; Matsuda, A ^[2]; Tseng, C -M ^[2]; Shigemasa, E ^[2]; Nagasono, M; Tono, K; Yabashi, M; Ishikawa, T ^[3]; Togashi, T; Ohashi, H; Kimura, H ^[3]; Senba, Y ^[4]

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1. Department of Environmental Science, Niigata University, Niigata 950-2181 (Japan)
2. Institute for Molecular Science, National Institutes of Natural Sciences, Okazaki 444-8585 (Japan)
3. RIKEN, XFEL Project Head Office, Sayo, Hyogo 679-5148 (Japan)
4. Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198 (Japan)

Photoelectron spectroscopy has been performed to study the multiphoton double ionization of Ar in an intense extreme ultraviolet laser field (h{nu}{approx}21 eV, {approx}5 TW/cm{sup 2}), by using a free electron laser (FEL). Three distinct peaks identified in the observed photoelectron spectra clearly show that the double ionization proceeds sequentially via the formation of Ar{sup +}: Ar+h{nu}{yields}Ar{sup +}+e{sup -} and Ar{sup +}+2h{nu}{yields}Ar{sup 2+}+e{sup -}. Shot-by-shot recording of the photoelectron spectra allows simultaneous monitoring of FEL spectrum and the multiphoton process for each FEL pulse, revealing that the two-photon ionization from Ar{sup +} is significantly enhanced by intermediate resonances in Ar{sup +}.

• OSTI ID: 21466978
• Journal Information: Physical Review Letters, Vol. 105, Issue 13; Other Information: DOI: 10.1103/PhysRevLett.105.133001; (c) 2010 American Institute of Physics; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ARGON
ARGON IONS
ELECTRON SPECTRA
ELECTRONS
EV RANGE
EXTREME ULTRAVIOLET RADIATION
FREE ELECTRON LASERS
INTERMEDIATE RESONANCE
LASER RADIATION
MULTI-PHOTON PROCESSES
PHOTOELECTRON SPECTROSCOPY
PHOTOIONIZATION
PHOTON-ATOM COLLISIONS
PULSES
ATOM COLLISIONS
CHARGED PARTICLES
COLLISIONS
ELECTROMAGNETIC RADIATION
ELECTRON SPECTROSCOPY
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
FERMIONS
FLUIDS
GASES
IONIZATION
IONS
LASERS
LEPTONS
NONMETALS
PHOTON COLLISIONS
RADIATIONS
RARE GASES
RESONANCE
SPECTRA
SPECTROSCOPY
ULTRAVIOLET RADIATION