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A: Fachverband Atomphysik
A 34: Poster II
A 34.48: Poster
Donnerstag, 5. März 2009, 16:30–19:00, VMP 9 Poster
High-power laser interacting with rare gases in the extreme ultra-violet — •Andrei A. Sorokin1,2, Sergey V. Bobashev2, Pavle Juranic3, and Mathias Richter1 — 1Physikalisch-Technische Bundesanstalt, Abbestraße 2-12, 10587 Berlin, Germany — 2Ioffe Physico-Technical Institute, Polytekhnicheskaya 26, 194021 St. Petersburg, Russia — 3Deutsches Elektronen-Synchrotron, Notkestraße 85, 22603 Hamburg, Germany
At the Free-electron LASer in Hamburg FLASH [1], we have studied the multi-photon ionization of rare gas atoms under the extreme conditions of ultra-high intensities in conjunction with short wavelengths. In the extreme ultra-violet (EUV) range at the wavelength of 13.7 nm, the generation of Ne7+, Ar7+, Kr7+, and Xe19+ ions was observed under equivalent conditions at irradiance levels up to 2.1015 W cm−2. The comparison demonstrates the particular behaviour of Xe compared to other gases which hardly can be explain within standard theories developed for optical radiation and based on ponderomotive motion of free electrons. In the EUV range, the electron structure of individual targets and the excitation of resonances play a significant role to describe the mechanisms of light-matter interaction. In particular, the high degree of non-linear photoionization of Xe and the unexpected irradiance dependence of the higher charge states obtained [2] might be explained by collective giant 4d inner-shell resonance and the wave character of EUV laser light.
[1] W. Ackermann et al., Nat. Photon. 1, 336 (2007) [2] A.A. Sorokin et al., Phys. Rev. Lett. 99, 213002 (2007)