SAMOP 2021 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 7: Poster 1
MO 7.3: Poster
Donnerstag, 23. September 2021, 17:30–19:30, P
Dynamics of photo-excited cesium atoms attached to helium nanodroplets — •N. Rendler1, A. Scognamiglio1, M. Barranco2,3, M. Pí2,3, N. Halberstadt4, K. Dulitz1, and F. Stienkemeier1 — 1Institute of Physics, University of Freiburg — 2Departament FQA, Faculty of Physics, University of Barcelona — 3Institute of Nanoscience and Nanotechnology, University of Barcelona — 4Laboratoire des Collisions, Agrégats, Réactivité, Paul Sabatier University
Due to the exceptional capability to isolate atoms, molecules and complexes and owing to the inertness of superfluid He, He nanodroplet isolation spectroscopy is a powerful technique to investigate molecular structure and dynamics. However, the low-perturbative character of the He environment is challenged for electronically excited or ionized dopant species. Various processes can be triggered by the electronic excitation and ionization of the dopant. For example, the ejection of electronically excited atoms can take place along with electronic relaxation induced by the He environment [1]. Additionally, He-dopant exciplexes can form due to the pairwise He-dopant interaction [2]. We present an experimental study of the time-resolved dynamics of photo-excited Cs atoms attached to He droplets [3]. The timescales for desorption and re-adsorption as well as for CsHe exciplex formation are determined for the 6p states of Cs using femtosecond pump-probe velocity-map-imaging spectroscopy and ion-time-of-flight spectrometry [3]. Our results are compared to time-dependant density-functional theory simulations published earlier [4].
[1] Loginov et al., J. Phys. Chem. A 111, 7504-7515, (2007)
[2] Reho et al., Faraday Discuss, 108, 161-174, (1997)
[3] Rendler et al., arXiv:2106.12330
[4] Coppens et al., Eur. Phys. J. D 73, 94, (2019)