Abstract
The far infrared (FIR) spectral region (which we will define as 0.3 – 10 THz [1mm to 30 μm]) plays an important role in molecular and atomic spectroscopy. The pure rotational transitions of light molecules, for example diatomic hydrides, occur in this region; FIR measurements provide the only accurate means of determining their rotational structure and associated characteristics such as line strengths, pressure broadening parameters, and permanent electric dipole moments. Heavier molecules can also be observed in the FIR. Their rotational transitions in this region involve high quantum numbers and therefore small but important centrifugal distortion effects can be measured. In atoms, transitions between fine structure levels as well as metastable levels occur at FIR frequencies.
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© 1990 Plenum Press, New York
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Zink, L.R., Prevedelli, M., Evenson, K.M., Inguscio, M. (1990). High Resolution Far Infrared Spectroscopy. In: Demtröder, W., Inguscio, M. (eds) Applied Laser Spectroscopy. NATO ASI Series, vol 241. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-1342-7_13
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DOI: https://doi.org/10.1007/978-1-4684-1342-7_13
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