Abstract
It is well established that the single molecule ortho-para states of hydrogen remain valid in the low pressure solid. In this paper we show that on theoretical grounds the concept of ortho-para states for the molecules in a solid should remain valid to megabar pressures and probably until the Wigner-Huntington dissociative transition to the atomic solid is reached. We calculate the density dependence of the mixing of para states into ortho states and give a general discussion of the density dependence of conversion rates.
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Silvera, I.F. The Validity of Ortho and Para States of Hydrogen at Megabar Pressures. Journal of Low Temperature Physics 112, 237–250 (1998). https://doi.org/10.1023/A:1022689816552
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DOI: https://doi.org/10.1023/A:1022689816552