Thumbnail
Access Restriction
Open

Author Hikosaka, Y. ♦ Fushitani, M. ♦ Hishikawa, A. ♦ Matsuda, A. ♦ Tseng, C. -M. ♦ Shigemasa, E. ♦ Nagasono, M. ♦ Tono, K. ♦ Yabashi, M. ♦ Ishikawa, T. ♦ Togashi, T. ♦ Ohashi, H. ♦ Kimura, H. ♦ Senba, Y.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword 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
Abstract 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 +}.
ISSN 00319007
Educational Use Research
Learning Resource Type Article
Publisher Date 2010-09-24
Publisher Place United States
Journal Physical Review Letters
Volume Number 105
Issue Number 13


Open content in new tab

   Open content in new tab