Heidelberg 2015 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 21: Posters 4: Novelties in Molecular Physics
MO 21.22: Poster
Donnerstag, 26. März 2015, 17:00–19:00, C/Foyer
Lamb-Dip rotational spectroscopy of OCS in the mm-wave region — •Oliver Zingsheim1, Jakob Maßen1, Sven Thorwirth1, Frank Lewen1, Marie-Aline Martin-Drumel1,2, and Stephan Schlemmer1 — 1I. Physikalisches Institut, Köln, Germany — 2Harvard-Smithsonian Center for Astrophysics, Cambridge, USA
Carbonyl sulfide (OCS) is a widespread and important molecule in the interstellar medium (ref [1] and references therein). Because of its astronomical relevance and also its importance as a calibration gas in the laboratory the pure rotational spectrum is comparably well studied in particular that of the parent isotopic species (see, for example, ref [2]). Here, we report on high precision Lamb-Dip measurements of rare isotopic species in the frequency range from 75 to 370 GHz. The measurements were performed in a 5m absorption cell with a roof-top mirror to allow for double pass of the mm wave radiation. Transitions of singly substituted isotopologues were measured (13C, 17O, 18O, 33S, 34S) resulting in new significantly improved sets of molecular parameters. Further Lamb-Dip measurements of transient molecules will be performed in the near future.
[1] A. Belloche, H. S. P. Müller, K. M. Menten, P. Schilke, C. Comito, Astron. & Astrophys. 559, A47 (2013).
[2] G.Yu. Golubiatnikov, A. V. Lapinov, A. Guarnieri, R. Knöchel, J. Mol. Spectrosc. 234 (2005) 190-194.