Erlangen 2022 – scientific programme
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MO: Fachverband Molekülphysik
MO 9: Femtosecond Spectroscopy II
MO 9.5: Talk
Wednesday, March 16, 2022, 11:30–11:45, MO-H5
Dynamics of photoexcited Cs atoms attached to helium nanodroplets — •Nicolas Rendler1, Audrey Scognamiglio1, Manuel Barranco2,3,4, Marti Pí2,4, Nadine Halberstadt3, Katrin Dulitz1, and Frank Stienkemeier1 — 1Institute of Physics, University of Freiburg, Germany — 2Departament FQA, Universitat de Barcelona, Spain — 3IRSAMC, Université de Toulouse, France — 4IN2UB, Universitat de Barcelona, Spain
We present an experimental study of the dynamics of photoexcited Cs atoms located in a dimple on the surface of He nanodroplets. The repulsive interaction between the electronically excited alkali atom and the He environment usually leads to the ejection of the excited alkali atom from the surface of the He nanodroplet [1]. This process can be accompanied by fast electronic relaxation induced by the He environment and by the formation of He-Cs exciplex molecules [2]. After ionization, alkali atoms tend to be attracted by the He nanodroplet which eventually leads to their solvation inside of the droplet interior. Using femtosecond pump-probe spectroscopy combined with velocity-map-imaging and ion-time-of-flight detection, we have determined the time scales for Cs atom ejection and solvation after excitation to the 6p state as well as for CsHe exciplex formation [3]. Our results are compared to results of density-functional-theory simulations [4]. [1] M. Mudrich, F. Stienkemeier, Int. Rev. Phys. Chem. 33, 301-339 (2014). [2] Reho et al., Faraday Discuss. 108, 161, (1997). [3] N. Rendler et al., J Phys Chem A. 125 (41), 9048-9059 (2021). [4] Coppens et al., Eur. Phys. J. D 73, 94, (2019).