J. Phys. Soc. Jpn. 91, 093601 (2022) [5 Pages]
LETTERS

Phase Transition in Fluid Hydrogen at Room Temperature

+ Affiliations
1Department of Physical Science and Materials Engineering, Faculty of Science and Engineering, Iwate University, Morioka 020-8550, Japan2Graduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan3Graduate School of Arts and Sciences, Iwate University, Morioka 020-8550, Japan4National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan5Faculty of Science, Niigata University, Niigata 950-2181, Japan

Rotational and vibration-rotational Raman spectra of fluid hydrogen (H2) at room temperature were investigated through Raman spectroscopy under pressure. All the rotational and vibration-rotational lines showed rapid pressure changes in Raman shifts at around 0.56 GPa. The peak analyses revealed that the ortho-para conversion of H2 was generated under pressure beyond 0.56 GPa at room temperature. Supposedly, that the anomalies obtained at 0.56 GPa at room temperature corresponded to a phase transition in fluid phase, inducing a significant change in the ratio of equilibrium composition of ortho- and para-H2.

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