Heidelberg 2015 – scientific programme

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MO: Fachverband Molekülphysik

MO 22: Femtosecond Spectroscopy 3

MO 22.2: Talk

Friday, March 27, 2015, 11:15–11:30, PH/HS1

Phase-modulated fs pump-probe spectroscopy of RbHe exciplexes — •Lukas Bruder, Marcel Binz, Aaron LaForge, Marcel Mudrich, and Frank Stienkemeier — Physikalisches Institut, Universität Freiburg, 79104 Freiburg

Due to the low target densities in molecular and doped He droplet beam experiments, coherent fs spectroscopy in such setups has remained a challenging task. In this context we are investigating a phase-modulation fs pump-probe technique established by Marcus et al. [1]. The combination of continuous acousto-optical phase modulation with lock-in detection greatly improves the signal-to-noise ratio in this scheme. We have applied this method to our He droplet beam apparatus and acquired mass-resolved photo ionization spectra of RbHe exciplexes. This data reveals much higher resolution than was previously achieved with conventional pump-probe setups. Furthermore, one gains new insight into the energy structure of the exciplex.

[1] P. F. Tekavec, T. R. Dyke, and A. H. Marcus, J. Chem. Phys. 125, 194303 (2006).