Stuttgart 2012 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 21: Poster 3: Cluster, Collisions, Energy Transfer, Photochemistry, Spectroscopy in He-Droplets

MO 21.27: Poster

Donnerstag, 15. März 2012, 16:30–19:00, Poster.IV

Infrared spectroscopy of small molecules inside helium nanodroplets using a narrow-linewidth VECSEL — •Michael Richter¹, Sebastian Kaspar², Marcel Rattunde², Markus Müller¹, Joachim Wagner², and Frank Stienkemeier¹ — ¹Physikalisches Institut, Universität Freiburg, Hermann-Herder-Str. 3, D-79104 Freiburg im Breisgau — ²Fraunhofer-Institut für Angewandte Festkörperphysik, Tullastrasse 72, 79108 Freiburg im Breisgau

We are presenting a setup to perform spectroscopy of small molecules like CO₂, CO or H₂O by using a tuneable, single mode operating VECSEL (Vertical External Cavity Surface Emitting Laser)¹. The laser system provides narrow-linewidth operation (<10kHz) and still delivers a reasonable output power in the region of 100mW to obtain absorption spectra with high resolution. We will focus on IR vibrational overtone spectroscopy in the 1.9 to 2.3 µm wavelength range.
Further on we plan to probe these molecules inside helium nanodroplets to study the interaction with the ultra cold (370mK) and superfluid matrix. In particular one expects relevant information on reduced rotational constants and the role of a normal fluid fraction in the vicinity of the dopant molecule.
¹ B. Rösener et al., Optics Letters Vol. 36, No. 18, 3587 (2011)