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Microwave Spectroscopes

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Spectroscopy at Radio and Microwave Frequencies

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Abstract

Details of microwave spectroscopes that have been designed and used are now considered, and the particular advantages of each discussed. Those employed for gaseous work are described first, and in these the energy level splittings which give rise to the absorption spectra, are produced by the rotational motion of the molecule. The resonance frequencies are therefore unaffected by external fields, to a first approximation, and the essential experimental requirement is thus a radiation source of continuously variable frequency. In contrast to this, the spectroscopes designed for paramagnetic resonance absorption are usually operated at a fixed frequency, and the applied magnetic field is varied to obtain resonance; since, in this case, the energy level splitting is produced by the direct interaction of the applied magnetic field with the magnetic moment associated with unpaired electrons. The other basic difference between the two types of spectroscope is that, in normal gaseous spectroscopy the absorption of energy is via the interaction of the microwave electric field with the electric dipole moment; whereas, in paramagnetic resonance it is via the microwave magnetic field and the magnetic moment.

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Authors and Affiliations

  1. University of Southampton, UK

    D. J. E. Ingram M.A.(Oxon), D.Phil.(Oxon) (Lecturer and Research Fellow)

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  1. D. J. E. Ingram M.A.(Oxon), D.Phil.(Oxon)
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© 1955 Butterworths Scientific Publications

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Ingram, D.J.E. (1955). Microwave Spectroscopes. In: Spectroscopy at Radio and Microwave Frequencies. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-0733-4_4

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  • DOI: https://doi.org/10.1007/978-1-4684-0733-4_4

  • Publisher Name: Springer, Boston, MA

  • Print ISBN: 978-1-4684-0735-8

  • Online ISBN: 978-1-4684-0733-4

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