Quantitative Rotational to Librational Transition in Dense H2 and D2

Raman spectroscopy demonstrates that the rotational spectrum of solid hydrogen, and its isotope deuterium, undergoes profound transformations upon compression while still remaining in phase I. We show that these changes are associated with a loss of quantum character in the rotational modes and that...

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Published inThe journal of physical chemistry letters Vol. 11; no. 16; pp. 6626 - 6631
Main Authors Peña-Alvarez, Miriam, Afonina, Veronika, Dalladay-Simpson, Philip, Liu, Xiao-Di, Howie, Ross T, Cooke, Peter I. C, Magdau, Ioan B, Ackland, Graeme J, Gregoryanz, Eugene
Format Journal Article
LanguageEnglish
Published American Chemical Society 20.08.2020
Subjects
Physical Insights into Quantum Phenomena and Function
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Summary:Raman spectroscopy demonstrates that the rotational spectrum of solid hydrogen, and its isotope deuterium, undergoes profound transformations upon compression while still remaining in phase I. We show that these changes are associated with a loss of quantum character in the rotational modes and that the angular momentum J gradually ceases to be a good quantum rotational number. Through isotopic comparisons of the rotational Raman contributions, we reveal that hydrogen and deuterium evolve from a quantum rotor to a harmonic oscillator. We find that the mechanics behind this transformation can be well-described by a quantum-mechanical single inhibited rotor, accurately reproducing the striking spectroscopic changes observed in phase I.
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ISSN:1948-7185
1948-7185
DOI:10.1021/acs.jpclett.0c01736