Berlin 2014 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 23: Femtosecond Spectroscopy 3

MO 23.2: Vortrag

Freitag, 21. März 2014, 14:15–14:30, BEBEL HS213

Strong field ionization of Butadiene with sub-7fs laser pulses — •Sascha Birkner, Federico Furch, Alexandria Anderson, Martin Galbraith, Jochen Mikosch, Claus Peter Schulz, and Marc J.J. Vrakking — Max-Born-Institut, Berlin, Deutschland

Strong field ionization (SFI) is a sub-cycle spectroscopic method and underlies most other attosecond spectroscopies. In recent years, it has been shown that in polyatomic molecules not only the ionic ground state but also excited ionic states are populated during SFI [1,2,3]. By combing a high repetition 400 kHz laser system delivering sub-7 fs, 4 µJ pulses at 800 nm with a reaction microscope enabling coincident detection of ion and electron momentum, the SFI of 1,3-Butadiene has been investigated. For different ionic fragment groups distinct electron momentum distributions have been observed. Our studies are particularly sensitive to the kinetic energy release of the ionic fragments. First observations point towards statistically driven unimolecular decay of the electronically excited cation.

[1] H. Akagi, et al., Science 325, 1364 (2009).

[2] A.E. Boguslavskiy, et al., Science 335, 1336 (2012).

[3] J. Mikosch, et al., Phys. Rev. Lett. 110, 023004 (2013).