Heidelberg 1999 – scientific programme
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MO: Molekülphysik
MO 8: Poster II: Spektroskopie
MO 8.4: Poster
Tuesday, March 16, 1999, 16:00–19:00, PA
Electronic Ground and Excited State Spectroscopy of C6H and C6D — •H. Linnartz1, T. Motylewski1, O. Vaizert1, J.P. Maier1, A.J. Apponi2,3, M.C. McCarthy2,3, C.A. Gottlieb3, and P. Thaddeus2,3 — 1Institute for Physical Chemistry, University of Basel, Klingelbergstrasse 80, CH4056 Basel — 2Harvard Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 — 3Division of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138
Rotational transitions in the X2Π ground state of C6H and C6D have been measured by a Fourier transform microwave and millimeter-wave spectrometer. In total more than 150 individual lines in the 2Π3/2 and 2Π1/2 rotational ladders have been observed, which allows an accurate determination of the rotational, fine structure, lambda-doubling and hyperfine coupling constants, using a standard effective Hamiltonian for a linear molecule in an isolated 2Π state. The molecular ground state constants are used to characterize the rotationally resolved origin band of the astronomically relevant 2Π ← X2Π electronic transition, recorded by cavity ring down spectroscopy in a pulsed supersonic slit jet plasma. From this experiment, spectroscopic constants for the upper electronic state are determined.