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High-resolution Microwave and Infrared Spectroscopy of Molecular Cations

  1. Takayoshi Amano1,2

Published Online: 15 SEP 2011

DOI: 10.1002/9780470749593.hrs052

Handbook of High-resolution Spectroscopy

Handbook of High-resolution Spectroscopy

How to Cite

Amano, T. 2011. High-resolution Microwave and Infrared Spectroscopy of Molecular Cations. Handbook of High-resolution Spectroscopy. .

Author Information

  1. 1

    University of Waterloo, Department of Chemistry and Department of Physics and Astronomy, Waterloo, Ontario, Canada

  2. 2

    Ibaraki University, Mito, Japan

Publication History

  1. Published Online: 15 SEP 2011


High-resolution spectroscopic results for molecular cations obtained in the wavelength regions from microwave to infrared are summarized, with emphasis on more recent developments made after the year 2000. Starting at some early stage development made with mostly discharge sources, various experimental techniques developed for the detection of ions are discussed in some details. Recent results on specific molecular ions such as H3+ and H3O+ and their isotopic species are reviewed to show what kind of information could be obtained with high-resolution spectroscopic techniques. The current status on a most challenging species in this field, CH5+, is described. Applications to and implications from astronomical observations are also described wherever they are relevant to spectroscopy.


  • molecular cations;
  • microwave;
  • submillimeter-wave;
  • terahertze-wave;
  • FIR;
  • IR;
  • discharge plasma;
  • supersonic jet expansion;
  • interstellar molecule;
  • interstellar molecular cloud