Hamburg 2009 – scientific programme

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MO: Fachverband Molekülphysik

MO 13: Molekülphysik Poster 1

MO 13.14: Poster

Tuesday, March 3, 2009, 16:30–19:00, VMP 8 Foyer

Pump-probe experiments on CO₂ in ultra-short intense laser pulses — •Bettina Fischer¹, Markus Schürholz¹, Manuel Kremer¹, Artem Rudenko², Sergui Patchkovskii³, Olga Smirnova³, Claus Dieter Schröter¹, Robert Moshammer¹, and Joachim Ullrich¹ — ¹Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany — ²Max-Planck Advanced Study Group within CFEL, Notkestrasse 85, 22607 Hamburg, Germany — ³National Research Council of Canada, Ottawa, Ontario K1A 0R6, Canada

The fragmentation dynamics of CO₂ in linearly polarized, intense (10¹⁴W/cm²) and ultra-short (7fs) laser pulses was studied in pump-probe experiments. Using a Reaction Microscope all created heavy fragments have been detected in coincidence.
A modulation of the CO₂²⁺ count rate as function of the delay time between pump and probe pulse was observed. It is caused by coherent superposition of several vibrational states of CO₂⁺ which are created in the first pump pulse. Their time-dependent ionization probability is then probed by the second pulse. Three modulation frequencies can be identified and are compared to spectroscopic data. Theoretical results for the excitation probabilities of the vibrational CO₂⁺ states are in good agreement with the present results and allow the identification of the contributing molecular states.