Hannover 2016 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 15: Femtosecond Spectroscopy 3
MO 15.1: Hauptvortrag
Donnerstag, 3. März 2016, 11:00–11:30, f102
Imaging of an autoionizing resonance using time-, energy- and angular-resolved photoelectron spectroscopy. — Martin Eckstein1, Chung-Hsin Yang1, Fabio Frassetto2, Luca Poletto2, Giuseppe Sansone3, Marc J. J. Vrakking1, and •Oleg Kornilov1 — 1Max-Born-Institute, Berlin, Germany — 2CNR-IFN, Padova, Italy — 3Politecnico, Milan, Italy
One of the prominent examples of multielectron dynamics is the atomic and molecular autoionization - emission of an electron from an electronically excited system. Such processes typically happen on time-scales of few tens of femtoseconds and requires time-resolved methods with excellent resolution. Here we investigate autoionizing Rydberg states of molecular nitrogen using time-, energy- and angular-resolved photoelectron spectroscopy employing a recently constructed time delay compensating XUV monochromator [1]. Probing the autoionizing resonance with an IR pulse upon the XUV excitation we observe, that angular distributions of the emitted electron depend on time, which indicates the presence of two coupled states forming the resonance. One of the states has a lifetime of 14 fs, while the lifetime of the other is too short to be detected. Such combination of short and long-lived states is similar to the effect of interference stabilization known in the field of laser-induced interactions and suggests that useful analogies exist between the latter and the field of multielectron dynamics. [1] Eckstein et. al., J. Phys. Chem. Lett. 6, 419 (2015)