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A: Fachverband Atomphysik
A 18: Ultrafast Spectroscopy with XUV (joint session MO/A)
A 18.4: Vortrag
Montag, 5. März 2018, 17:15–17:30, PA 2.150
Molecular Light-Induced Couplings Revealed by Attosecond Transient Absorption Spectroscopy — •Lorenz Drescher, Geert Reitsma, Tobias Witting, Serguei Patchkovskii, Marc Vrakking, and Jochen Mikosch — Max-Born-Institut, Berlin, Deutschland
Attosecond transient absorption spectroscopy (ATAS) is the study of the modulation of absorption of short attosecond XUV pulses in matter by a phase-locked strong IR pulse. In recent years, ATAS has been used to study the light-induced coupling of nearby states in atoms [1] and homonuclear molecules.
Here we present results from our experimental and theoretical study of ATAS of a polyatomic molecule (CH3I) in the core-to-valence and core-to-Rydberg transition region. Core-excited states are an interesting target for transient absorption because element specific transitions give a local view into the molecular valence [2]. For ATAS they are additionally intriguing because the short coherence time (due to fast Auger decay of the core-hole) enhances the sub-cycle dependence on the probing IR field.
Our results show the sub-cycle dependent light-induced coupling of states due to the AC Stark effect. It shows that the coupling of the core-to-Rydberg states is much stronger than the coupling of the core-to-valence states.
[1] C. Ott, et al., Nature 516, 374-378 (2014).
[2] L. Drescher et al., JCP 145, 011101 (2016).