Low-frequency electromagnetic radiation of hydrogen molecular gas: Effect of the ortho-para conversion

A. M. Ishkhanyan, V. P. Krainov

Research output: Contribution to journalArticle


We calculate the rate of the spontaneous magnetic dipole radiation transitions from ortho-to para-states of the hydrogen molecule at room temperature with radiation wavelengths of about 0.01-0.1 cm. Exponentially small differences between the rotational energies and heat capacities of parahydrogen, orthohydrogen molecules and diatomic molecules consisting of different hydrogen atoms for high temperatures are derived.

Original languageEnglish
Article number235401
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Issue number23
Publication statusPublished - 13 Nov 2018



  • magnetic dipole transitions
  • orthohydrogen molecule
  • parahydrogen molecule
  • partition function
  • spin flip

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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