Hannover 2013 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 17: Interaction with strong or short laser pulses II
A 17.3: Vortrag
Dienstag, 19. März 2013, 14:45–15:00, B 302
Covariance mapping of Coulomb explosion in N2 and I2 after excitation with 90 eV XUV pulses at FLASH — •Oleg Kornilov1, Leszek J. Frasinski2, Claus Peter Schulz1, and Marc J.J. Vrakking1 — 1Max Born Institute, Max-Born-Str. 2a, 12489 Berlin, Germany — 2Imperial College London, South Kensington Campus, London, United Kingdom
Intense femtosecond XUV pulses produced by Free Electron Lasers can remove many electrons from inner-shell and valence molecular orbitals. The ensuing dynamics lead to Coulomb explosion due to separation of charges on constituent molecular fragments. In this contribution we report detailed measurements of Coulomb explosion in N2 and I2 at 91 eV recorded at FLASH by ion time-of-flight technique. The correlation of the different ionic fragments is evaluated using partial covariance mapping, a technique that allows to extract information on correlated detection events, where conventional coincidence methods cannot be applied. Different ionic fragment pairs N+q + N+q′ are identified and their kinetic energy distributions are extracted with help of the covariance maps. The results are compared to a model calculation, which implements classical trajectories for description of the Coulomb explosion dynamics.