Multiphoton ionization of He by using intense high-order harmonics in the soft-x-ray region

Journal Article · Tue Feb 01 00:00:00 EST 2005 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.71.023407· OSTI ID:20650103

Hasegawa, Hirokazu; Takahashi, Eiji J; Nabekawa, Yasuo; Midorikawa, Katsumi ^[1]; Ishikawa, Kenichi L ^[2]

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1. Laser Technology Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan)
2. Department of Quantum Engineering and Systems Science, Graduate School of Engineering, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656 (Japan)

We report on the multiphoton ionization processes in the soft-x-ray region ({lambda}{<=}30 nm). On the basis of the measured time-of-flight spectra for both ions and electrons obtained using intense soft-x-ray pulses produced by high-order harmonics, the cross sections of the two-photon double ionization and above-threshold ionization of He are estimated. The high-intensity soft-x-ray radiation achieved by phase-matched high-order harmonics enables the investigation of these nonlinear optical processes, which were beyond the reach of conventional light sources.

• OSTI ID: 20650103
• Journal Information: Physical Review. A, Vol. 71, Issue 2; Other Information: DOI: 10.1103/PhysRevA.71.023407; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
CROSS SECTIONS
ELECTRONS
HARMONIC GENERATION
HARMONICS
HELIUM
IONS
LIGHT SOURCES
NONLINEAR OPTICS
NONLINEAR PROBLEMS
PHOTOIONIZATION
PHOTON-ATOM COLLISIONS
PHOTONS
PULSES
SOFT X RADIATION
TIME-OF-FLIGHT METHOD
X-RAY SPECTRA