Darmstadt 2008 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 12: Posters: Interaction with intense laser pulses
A 12.9: Poster
Dienstag, 11. März 2008, 16:30–18:30, Poster C3
Formation of H2+ in laser-induced fragmentation of CH4 — •Bettina Fischer, Ulrich Wiedemann, Artem Rudenko, Manuel Kremer, Thorsten Ergler, Karl Zrost, Bernold Feuerstein, Andreas Achtelik, Claus Dieter Schröter, Robert Moshammer, and Joachim Ullrich — Max-Planck-Institut für Kernphysik, Heidelberg
Three-dimensional coincident momentum spectroscopy is used to study the molecular fragmentation dynamics of CH4. Therefore the CH4 molecules have been exposed to linear polarized intense ( 3*1014W/cm2) short (9fs) laser pulses while the outcoming ions and electrons were detected by using a "Reaction Microscope"
Single-shot as well as pump-probe experiments have been performed both showing a noticable amount of H2+ ions in the timo-of-flight spectra.
By analyzing the coincident ion spectra we found out that H2+ ions originate from the channel CH4→ CH2+ + H2+ + 2e−. Thus, the formation of an H−H bond occurs on the time scale of the laser pulses, e.g. within a few femtoseconds.