Nonlinear photoionization in the soft X-ray regime

Details Nonlinear photoionization in the soft X-ray regime Nonlinear photoionization in the soft X-ray regime

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008appha..92..473r&link_type=abstract

Applied Physics A, Volume 92, Issue 3, pp.473-478

Astronomy and Astrophysics

Astronomy

4

32.80.Rm, 32.80.Fb, 06.30.-K, Multiphoton Ionization And Excitation To Highly Excited States, Photoionization Of Atoms And Ions, Measurements Common To Several Branches Of Physics And Astronomy

Scientific paper

At the new Free-electron LASer in Hamburg FLASH, we have studied photon-matter interaction by means of ion time-of-flight spectroscopy on gases in the soft X-ray regime. Emphasis was laid on the quantitative investigation of non-linear effects upon photoionization by the highly intense soft X-ray laser pulses. In the photon energy range from 38 to 93 eV, we have observed nonlinearities due to space-charge effects, target depletion, and sequential and direct multi-photon ionization at irradiance levels of up to 1016 W cm-2. The work is related to the development of photon diagnostic tools that are based on gas-phase photoionization for current and future X-ray laser facilities but might be of significance for any experiment at fourth generation light sources.

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