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Calendar: ALS Calendar
Title: ALS/NGLS Special Seminar: Dr. Marc Vrakking, Director, Max Born Institute
When: 10/11/2012 4:00 PM - 4:50 PM
Description: Speaker: Marc Vrakking
Max-Born Institute, Berlin

Host: Roger Falcone

Title: Novel XUV/X-ray based methods for studying time-resolved atomic and molecular dynamics

In the last few years, several new methodologies have emerged to study atomic and molecular dynamics in the time-domain. On the one hand, the development of attosecond pulses by high-harmonic generation has led to the development of a new class of pump-probe experiments, where electron dynamics in atomic and molecular systems is studied on its natural – attosecond – timescale. On the other hand, the use of ultrashort pulse sources in the XUV/X-ray domain has stimulated the development of novel approaches for studying time-resolved molecular dynamics that are based on diffractive properties of high energy electrons, rather than the relation between the molecular structure and the photo-absorption spectrum. Accompanying both of these developments, complementary studies of strong-field ionization provide further information on atomic and molecular structure and dynamics that may be considered to be extremely promising.
In my talk, I will present an overview of our recent experimental efforts in this area. I will discuss experiments that illustrate the importance of multi-electron effects in strong-field ionization [1] that provide a motivation for future attosecond pump-probe experiments on charge migration in molecules, and will discuss the present status of attosecond experiments on molecular systems [2, 3], as well as experiments aimed at using the diffraction of high energy electrons to study time-dependent molecular dynamics [4]. Finally, I will discuss experiments on the recently developed concept of strong-field photoelectron holography, which provides an alternative way to implement these concepts [5, 6].

1.Boguslavskiy, A.E., et al., The Multielectron Ionization Dynamics Underlying Attosecond Strong-Field Spectroscopies. Science, 2012. 335(6074): p. 1336-1340.
2.Sansone, G., et al., Electron localization following attosecond molecular photoionization. Nature, 2010. 465(7299): p. 763-U3.
3.Kelkensberg, F., et al., Attosecond Control in Photoionization of Hydrogen Molecules. Physical Review Letters, 2011. 107(4): p. 043002.
4.Kelkensberg, F., et al., XUV ionization of aligned molecules. Physical Review A, 2011. 84(5): p. 051404.
5.Huismans, Y., et al., Time-Resolved Holography with Photoelectrons. Science, 2011. 331(6013): p. 61-64.
6.Huismans, Y., et al., Scaling Laws for Photoelectron Holography in the Midinfrared Wavelength Regime. Physical Review Letters, 2012. 109(1): p. 013002.
Location: 15-253