Rostock 2019 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 15: Attosecond physics
A 15.1: Hauptvortrag
Mittwoch, 13. März 2019, 10:30–11:00, S HS 3 Physik
Decomposition of the Temporal and Spectral Response in Attosecond Transient Absorption Spectroscopy — •Lorenz Drescher, Vishal Shokeen, Tobias Witting, Serguei Patchkovskii, Marc Vrakking, and Jochen Mikosch — Max-Born-Institut, Berlin, Deutschland
Attosecond Transient Absorption Spectroscopy (ATAS) of core-excited states provides the opportunity to study ultrafast phenomena in organic molecules from the local perspective of a reporter atom. In molecules, high densities of states and broad natural linewidths may complicate the analysis of overlapping features, while the low flux of current-generation attosecond sources requires high detector sensitivity and long acquisition times. Here we discuss the use of Singular Value Decomposition for ATAS to extract spectral and temporal dynamics associated with the state-dependent light-induced phase, while efficiently separating contributions from energy-and-time correlated features and detector noise. We apply the technique to our recent results of ATAS in iodomethane (CH3I) [1] to extract the state-resolved polarizability of the molecule. We also discuss the possibility to in-situ characterize the electric-field of the laser from the molecular ATAS measurement.
[1] L. Drescher et al., submitted to J. Phys. Chem. Lett. (2018)