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MO: Fachverband Molekülphysik

MO 13: Posters 3: Cold Molecules, Helium Nano Droplets, and Experimental Techniques

MO 13.12: Poster

Mittwoch, 19. März 2014, 16:30–18:30, Spree-Palais

MEASUREMENT OF THE LIFETIME OF THE FIRST VIBRATIONALLY EXCITED STATE OF MGH+ — •Oscar O. Versolato^1,4, Maria Schwarz^1,4, Anders K. Hansen², Alex D. Gingell², Alexander Windberger¹, Łukasz Kłosowski³, Joachim Ullrich⁴, Frank Jensen², José R. Crespo López-Urrutia¹, and Michael Drewsen² — ¹Max-Planck-Institut für Kernphysik, Heidelberg, Germany — ²Aarhus University, Denmark — ³Nicolaus Copernicus University, Torun, Poland — ⁴Physikalisch-Technische Bundesanstalt, Braunschweig, Germany

Diatomic hydrides are a basic class of molecules with dipole-allowed rovibrational transitions, readily observable in the interstellar medium (ISM) both in their neutral and singly ionized states. In general, their abundances in the ISM are derived from mm-wave and deep infrared absorption and emission lines for which precise knowledge of the relevant rovibrational transition strengths is required. We present here a method for obtaining such transition strengths employing a direct laser excitation scheme and exploiting the cryogenic environment of our cryogenic Paul trap CryPTEx, in which blackbody radiation induced rotational dynamics are slowed down and excellent vacuum conditions exist, enabling the measurement of the lifetime of the first vibrationally excited state in MgH+ by means of laser excitation to this state, followed by resonance enhanced two-photon dissociation of the ions that were sympathetically cooling into a Coulomb crystal. The method presented here can readily be extended to other molecules of particular astrophysical relevance.