Millimeter-wave rotational spectroscopy of carbonyl sulfide, OCS

The pure rotational fingerprints of molecules are typically in the technically challenging millimeter and submillimeter region. Here we will get familiar with a state-of-the-art spectrometer, which fulfills nowadays requirements of astronomers like high resolution and sensitivity to interpret their data, received for example from the Atacama Large Millimeter Array (ALMA). Technical details and methods are explained but special focus is on understanding and interpreting the composition and structure of rotational Fingerprints of the linear molecule OCS. 

M. Winnewisser, Interstellare Moleküle und Mikrowellenspektroskopie I, Chemie in unserer Zeit 18(1), 1 (1984)

M. Winnewisser, Interstellare Moleküle und Mikrowellenspektroskopie II, Chemie in unserer Zeit 18(2), 55 (1984)

S. L. Widicus Weaver, Millimeterwave and Submillimeterwave Laboratory Spectroscopy in Support of Observational Astronomy, Annu. Rev. Astron. Astrophys. 57, 79 (2019)

Lab course instructions OCS (PDF)


  • J. M. Hollas, Modern Spectroscopy, 4th edition, Wiley, 2004.
  • C. H. Townes and A. L. Schawlow, Microwave Spectroscopy, Dover, 1975.
  • G. M. Barrow, Introduction to Molecular Spectroscopy, McGraw-Hill, 1962.
  • W. Gordy and R. L. Cook, Microwave Molecular Spectra, John Wiley and Sons, 1984.


Oliver Zingsheim,  Tel.: -1665
Sven Thorwirth, Tel.: -1936
Frank Lewen,      Tel.: -2757