Berlin 2014 – scientific programme
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MO: Fachverband Molekülphysik
MO 14: Cold Molecules 2
MO 14.4: Talk
Thursday, March 20, 2014, 11:15–11:30, BEBEL HS213
Spectroscopy of Cold RbSr Molecules Formed on Helium Nanodroplets — •Florian Lackner, Günter Krois, Johann V. Pototschnig, Thomas Buchsteiner, and Wolfgang E. Ernst — Institute of Experimental Physics, Graz University of Technology, Petersgasse 16, A-8010 Graz, Austria
We report on the first spectroscopic investigation of the RbSr molecule. The molecules are prepared in their vibronic ground state in a sequential pickup process on the surface of helium nanodroplets, confined in a cold (0.38 K) and weakly perturbing superfluid environment. Based on our seminal work on LiCa [1], we extend our studies to the previously unobserved RbSr molecule, the most promising candidate for the creation of ultracold polar alkali-alkaline earth molecules. Utilizing resonance-enhanced multi-photon ionization time-of-flight (REMPI-TOF) spectroscopy and laser induced fluorescence (LIF) spectroscopy our investigations cover the spectral regime of 11500 cm−1 - 16500 cm−1. The weak interaction between molecules and helium droplets causes a broadening of observed transitions. For spectrally resolved band systems the helium droplet isolation approach facilitates the determination of molecular constants. Our assignment is assisted by theoretical calculations of potential energy curves based on a multireference configuration interaction (MRCI) approach. Several strong transitions could be identified; the most prominent spectral feature is a vibrational resolved band system at 14000 cm−1.
[1] G. Krois, J.V. Pototschnig, F. Lackner and W.E. Ernst, J. Phys. Chem. A, DOI: 10.1021/jp407818k (2013)