Stuttgart 2012 – scientific programme

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MO: Fachverband Molekülphysik

MO 13: Poster 1: Cold Molecules, Femtosecond Spectroscopy, Molecular Dynamics

MO 13.24: Poster

Tuesday, March 13, 2012, 16:30–19:00, Poster.IV

CRASY: Correlated Rotational Alignment Spectroscopy of Molecules and Clusters — Christian Schröter and •Thomas Schultz — Max-Born-Institut, Berlin

When a molecule is ionized, the formed electron and ion can be detected with quantum yields close to one, leading to an extraordinarily sensitive characterization of molecular mass and electronic structure. By using pump-probe ionization schemes, the characterization can be extended to photoexcited species to observe photochemical reactions in real time. The information content of such experiments, however, is insufficient for spectroscopic assignment of molecular structure in all but the most trivial molecules.

Rotational spectroscopy is a very sensitive tool to characterize molecular structure. We recently demonstrated the correlated measurement of rotational spectra and pump-probe ionization spectra by correlated rotational alignment spectroscopy (SCIENCE 333, 1011 (2011)).The experiment combines the extraordinary sensitivity of ionization spectroscopy with the high-resolution information of rotational spectroscopy. Through the simultaneous determination of molecular masses, electron binding energies, and rotational structure for multiple species in a sample, CRASY can generate spectroscopic data of a new quality and with unprecedented information content. Our poster will present the experimental technique and show recent results of CRASY measurements.