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The infrared spectrum of H3+ in laboratory and space plasmas

Takeshi Oka

Takeshi Oka

  • Department of Chemistry and Department of Astronomy and Astrophysics, The University of Chicago, Chicago, Illinois 60637

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Rev. Mod. Phys. 64, 1141 – Published 1 October, 1992

DOI: https://doi.org/10.1103/RevModPhys.64.1141

Abstract

Protonated hydrogen, H3+, composed of three protons and two electrons, is the simplest stable polyatomic system. It is the most abundant ionic species in molecular hydrogen plasmas, and it is assumed to play a central role in the chemical evolution of molecular clouds, the birthplace of stars. The existence of this species has been known since its discovery by J. J. Thomson in 1912, but its first spectrum was observed only in 1980. The infrared spectrum has since been extended to higher vibrational and rotational states. The existence of a large amount of H3+ in Nature was first demonstrated in the serendipitous discovery of its infrared emission bands in the polar auroral regions of the Jupiter ionosphere. The spectrum is extremely intense and pure and can be used to monitor the morphology and temporal variation of the dynamic Jovian plasmas. Early this year, an identification of H3+ emission was claimed in Supernova 1987A. In April strong H3+ infrared emission was detected in Uranus. These developments are reviewed and the future is projected.

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Rev. Mod. Phys. 64, 1141– Published 1 October, 1992

    © 1992 American Physical Society

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