Carbon Chain- and Ring-Molecules in the Laboratory and in Space

Details Carbon Chain- and Ring-Molecules in the Laboratory and in Space Carbon Chain- and Ring-Molecules in the Laboratory and in Space

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001phdt........34t&link_type=abstract

PhD Thesis, Universität zu Köln, 2001

Astronomy and Astrophysics

Astrophysics

6

Scientific paper

In this thesis, the results of rotational laboratory spectroscopic studies of selected astrophysically important molecules as well as of astronomical observations of the linear carbon chain molecules HCN, HC3N and HC5N are presented. In the course of the laboratory spectroscopic investigations, millimeter- and submillimeter-wave spectra of HC3N and its monosubstituted isotopomers HCC13CN, HC13CCN, H13CCCN, and HCCC15N in the ground vibrational and selected astrophysically relevant vibrationally excited states were investigated. Furthermore, the doubly substituted isotopomers HC13C13CN, H13CC13CN, H13C13CCN, and HCC13C15N could be characterized for the first time by means of rotational spectroscopy. To obtain reliable predictions for astronomical searches for direct l-type transitions of hydrogenisocyanide, HNC, in its v2=1 vibrational state, the corresponding ΔJ=1 vibrational satellites were investigated up to 2THz. In addition, appropriate transitions belonging to the ground vibrational state were investigated. In the case of hydrogencyanide, HCN, the direct l-type transitions of the v2=1 state were measured in the 2mm and 4mm regime. Finally, the pure rotational spectrum of ethylenimine (c-C2H4NH) was investigated in selected frequency regions from 9GHz to 1.88THz. Stark-measurements of appropriate hyperfine transitions permitted the determination of reliable values for the two non-zero dipole moment components μb=0.97(12)D and μc=1.357(25)D. The new data set allows for accurate predictions of transition frequencies and line intensities required for an astronomical search for this molecule. Radio astronomical observations of HCN toward the protoplanetary nebula CRL618, the galactic center source SgrB2(N), and the regions Orion-KL and G10.47+0.03 yielded the first detection of direct l-type transitions of a linear molecule in space. Observations of HC3N in CRL618 and subsequent analysis of the vibrational satellite patterns of several rotational transitions provided valuable information concerning the temperature structure of the circumstellar envelope. The detection of vibrational satellites belonging to HC5N in CRL618 marks the first detection of vibrationally excited HC5N in space.

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