Physics
Scientific paper
Feb 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005phrva..71b3407h&link_type=abstract
Physical Review A, vol. 71, Issue 2, id. 023407
Physics
80
Multiphoton Ionization And Excitation To Highly Excited States, Frequency Conversion, Harmonic Generation, Including Higher-Order Harmonic Generation
Scientific paper
We report on the multiphoton ionization processes in the soft-x-ray region ( λ⩽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.
Hasegawa Hirokazu
Ishikawa Kenichi L.
Midorikawa Katsumi
Nabekawa Yasuo
Takahashi Eiji J.
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