Siegel der Universität

Universität zu Köln
Mathematisch-Naturwissenschaftliche Fakultät
Fachgruppe Physik

I. Physikalisches Institut

The Cologne Carbon Cluster Spectrometer

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The Cologne Carbon Cluster experiment combines a high resolution tunable IR diode laser spectrometer with an UV laser ablation source to record the rotationally resolved spectra of antisymmetric stretching modes of small carbon clusters. These measurements provide information about their chemical structure (e.g. linear or bend) as well as reference data for astrophysical research. So far we were able to detect the linear forms of several pure carbon clusters, for example C8 and C10, both being first detections in the gasphase.
Recently, we extended our investigations to the hot bands of some of the linear species, e.g. of C7, to gain information on their pure bending modes.

Look for more details about:

Part of the spectrum of C7
Part of the spectrum of linear C7: Assignments for the ν4 fundamental and three identified hot bands. Lines labeled with asterisks are unidentified ones.
Contact: Prof. Dr. Thomas Giesen (giesen[at]
  Dipl. Phys. Jürgen Krieg (krieg[at]


Related Publications

  • The high resolution infrared spectra of the linear carbon cluster C7: The ν4 stretching fundamental band and associated hot bands,
    P. Neubauer-Guenther, T.F. Giesen, S. Schlemmer, K.M.T. Yamada, J. Chem. Phys. 127, Art.-No. 014313 (2007)
  • Rovibrational Spectroscopy on Linear C7 and C8 in a Supersonic Jet Expansion,
    Dissertation Dr. P. Neubauer-Guenther, Universität zu Köln (2006)
  • The Cologne Carbon Cluster Experiment: Ro-Vibrational spectroscopy on small carbon clusters,
    P. Neubauer-Guenther, T.F. Giesen, U. Berndt, G. Fuchs, G. Winnewisser, Spectrochimica Acta Part A 59, 431-441 (2003)
  • Detection of the Linear Carbon Cluster C10: Rotationally Resolved Diode-Laser Spectroscopy,
    T.F. Giesen, U. Berndt, K.M.T Yamada, G. Fuchs, R. Schieder, G. Winnewisser, R.A. Provencal, F.N. Keutsch, A.O. Van Orden, and R.J. Saykally, ChemPhysChem 4/2001, 242-247
  • Interstellar Detection of C3 and High-Precision Laboratory Measurements Near 2 THz,
    T.F. Giesen, A.O. Van Orden, J.D. Cruzan, R.A. Provencal, R.J. Saykally, R. Gendriesch, F. Lewen, and G.Winnewisser, Astrophys. J. 551, L181-L184 (4/2001)Infrarot-Spektroskopie an kleinen Kohlenstoff-Clustern,
    Dissertation Dr. U. Berndt, Universität zu Köln (2000)