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Thea 3 Σ + g -c 3 Π u andc 3 Π u -a 3 Σ + g systems in the infrared spectrum of H2 and D2

  • Atomic and Molecular Physics
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Acta Physica Hungarica

Abstract

The infrared H2 laser lines recently discovered by McK night and Barr belong to thea 3 Σ + g -c 3 Π u system. This system has not previously been observed although both upper and lower state are well defined from the visible spectrum. We have observed for H2 both thea≠c and thec≠a transition near 2700 and 2100 cm−1 and for D2 thea≠c transition near 2000 cm−1. Laser action occurs only for the strongest lines of theP branch, viz.P(2) for H2,P(1) for D2 of thea≠c system. The inverted population causing laser action is produced by the strong predissociation of the3 Π + u component of thec state. In thec≠a system the same predissociation causes the absence ofP andR branches. The Δv=0 sequence of thea≠c system lies in the region 100 to 1000 cm−1; it has not been observed. Considering the much larger Franck—Condon factors for this sequence it should give rise to strong laser action.

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Authors and Affiliations

  1. National Research Council of Canada, K1A OR6, Ottawa, Ontario, Canada

    I. Dabrowski & G. Herzberg

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  1. I. Dabrowski
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  2. G. Herzberg
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Dedicated to Prof. I. Kovács on his 70th birthday

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Dabrowski, I., Herzberg, G. Thea 3 Σ + g -c 3 Π u andc 3 Π u -a 3 Σ + g systems in the infrared spectrum of H2 and D2 . Acta Physica Hungarica 55, 219–228 (1984). https://doi.org/10.1007/BF03155935

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  • DOI: https://doi.org/10.1007/BF03155935

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