Spectral Line Fundamentals

  • K. Rohlfs
  • T. L. Wilson
Part of the Astronomy and Astrophysics Library book series (AAL)


In local thermodynamic equilibrium (LTE) the intensities of emitted and absorbed radiation are not independent but are related by Kirchhoff’s law (1.14). This applies to both continuous radiation and line radiation. The Einstein coefficients give a convenient means to describe the interaction of radiation with matter by the emission and absorption of photons.


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Copyright information

© Springer-Verlag Berlin Heidelberg 1996

Authors and Affiliations

  • K. Rohlfs
    • 1
  • T. L. Wilson
    • 2
  1. 1.Institut für AstrophysikUniversität BochumBochumGermany
  2. 2.MPI für RadioastronomyBonnGermany

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