Abstract
Methane-type molecules (symmetry group Td) had been regarded as nonpolar for a long time and therefore no rotational spectrum and no Stark effect was expected to be observable. With high sensitive spectroscopic techniques, as molecular-beam [1], far infrared [2], microwave [3], radiofrequency infrared double resonance [4] and laser Stark spectroscopy [5] the existence of a permanent dipole moment could be proved for CH4. This dipole moment arises from centrifugal distortion in the vibrational ground state.
Vortrag gehalten anläßlich der Fachtagung “Laserspektroskopie”, Graz, 19.–21. Juni 1978.
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Unpublished.
The IR spectrum with a resolution of 0.06 cm 1 was taken with J.W.C. John’s spectrometer at the National Research Council of Canada, Herzberg Institute of Astrophysics.
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Kreiner, W.A. (1979). Stark Effect Observations in the “Nonpolar” Molecules GeH4 and CD4 . In: Aussenegg, F. (eds) Laserspektroskopie. Acta Physica Austriaca, vol 20/1979. Springer, Vienna. https://doi.org/10.1007/978-3-7091-7609-2_12
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DOI: https://doi.org/10.1007/978-3-7091-7609-2_12
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