SAMOP 2023 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 21: Ultrafast Dynamics II (joint session MO/A)
A 21.2: Vortrag
Donnerstag, 9. März 2023, 11:15–11:30, F102
RABBITT experiments in a vibrationally active ammonia molecule — •Lisa-Marie Koll1, David Sorribes Ortiz2, Ignacio Martínez Casasús2, Tobias Witting1, Lorenz Drescher1,4, Oleg Kornilov1, Marc JJ Vrakking1, Fernando Martin3, and Luis Bañares2 — 1Max Born Institute, Berlin — 2Universidad Complutense de Madrid — 3Universidad Autónoma de Madrid and IMDEA Nanociencia — 4University of California, Berkeley
Many RABBITT (Reconstruction of Attosecond Beatings By Interferences of Two-photon Transitions) experiments have been carried out so far for (rare gas) atoms to disentangle the evolution of an electronic wave packet by measuring the photoemission time delays. In molecules, the experiments are more complicated due to the nuclear degrees of freedom. Previously, RABBITT experiments could resolve vibrations in the photoelectron spectrum of N2 [1], and N2O [2]. Here, we present RABBITT experiments on NH3 using the velocity map imaging (VMI) technique. NH3 belongs to the C3v symmetry group and, as a result of the photoionization process, symmetry is shifted to the D3h conformation in NH3+. The ionization of ammonia is accompanied by rich vibrational structure, such as the long vibrational progression in the v2 umbrella inversion mode of the X2A2 state. These RABBITT experiments present an interesting and challenging case for full-dymensional theoretical calculations and help to demonstrate the capability of the RABBITT method to study in depth vibronic dynamics in polyatomic molecules. [1] S. Haessler et al., Phys. Rev. A 80, 01140R (2009) [2] L. Cattaneo et al., Nature Phys. 14, 733 (2018)