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Interpretation of the level population distribution of highly rotationally excited H2 molecules in diffuse clouds

Published online by Cambridge University Press:  07 August 2017

R. Wagenblast
R. Wagenblast*
Affiliation:
Department of Mathematics, UMIST, PO Box 88, Manchester M60 1QD, UK

Extract

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The observed H2 level population distribution of the rotational levels J = 5, 6 and 7 in the ground electronic and vibrational state X(v = 0) is analysed using available Copernicus data (Spitzer and Morton, 1976) for the diffuse clouds toward the stars ζ Oph, δ Per and ξ Per. The abundances of H2 in these high purely rotationally excited energy levels are due to the influence of one or more of three possible excitation mechanisms: collisions with abundant particles (e.g. H atoms and H2 molecules), UV-photoexcitation and H2 formation.

Type
Diffuse, Translucent and High-Latitude Clouds
Information
Symposium - International Astronomical Union , Volume 150: Astrochemistry of Cosmic Phenomena , 1992 , pp. 157 - 158
Copyright
Copyright © Kluwer 1992 

References

REFERENCES

Hunter, D A and Watson, W D: 1978, Astrophys. J. 226, 477 Google Scholar
Spitzer, L and Morton, W A: 1976, Astrophys. J. 204, 731 CrossRefGoogle Scholar