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A: Fachverband Atomphysik

A 8: Poster I

A 8.3: Poster

Dienstag, 9. März 2010, 16:30–19:00, Lichthof

Studies of rare-gas clusters in intense IR laser fields — •Siva Rama Krishnan¹, Bettina Fischer¹, Manuel Kremer¹, Robert Moshammer¹, Joachim Ullrich¹, Jagannath Jha², and Krishnamurthy Manchikanti² — ¹Max Planck Insitut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany — ²Tata Institute of Fundamental Research, 1 Homi Bhabha Road, Mumbai 400005, India

We report studies on the dynamics of Argon clusters in intense IR femtosecond laser fields. These were carried out at intensities of ∼10¹⁵W.cm⁻² and a central wavelength of 800nm using a Ti:Sapphire based femtosecond laser system delivering 25fs pulses. Clusters with a log-normal size-distribution were generated by the supersonic expansion of Argon gas with sizes ranging from 10³-10⁵ atoms/cluster. We present results on kinetic energy spectra of ions and electrons from time-of-flight measurements. The general characteristics of the ion spectra compare well with earlier investigations on rare-gas clusters. We also compare these spectra with appropriate theoretical models which incorporate the final Coulomb explosion of charged clusters taking into account the distribution of cluster sizes in the target and the distribution of intensities in the laser focus.