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説明:

This study aimed to elucidate the structural evolution of supercritical fluid hydrogen (SCF H2) under high pressure. X-ray diffraction was performed on SCF H2 using synchrotron radiation at room temperature. Diffraction peaks of structural factors S(Q) were observed at a low-Q region under pressure, revealing a crossover at around 0.56 GPa, consistent with our previous Raman spectroscopy results. The average volume per molecule was calculated at each pressure using the center-to-center distance between the nearest neighboring H2 molecules, reflecting van der Waals interactions and compression of the internuclear distance. The volumes calculated from the face-centered cubic model were consistent with those derived from the cited equation of state, with a slight discrepancy that increased gradually with the pressure. This finding indicates that further densification proceeds via pressurization following the crossover, which cannot be adequately explained by the close-packed coordination model alone.

権利情報:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

キーワード: hydrogen, supercritical fluid, high pressure, x-ray diffraction, Frenkel line

刊行年月日: 2026-10-15

出版者: American Chemical Society (ACS)

掲載誌:

• The Journal of Physical Chemistry Letters (ISSN: 19487185) vol. 17 issue. 41 p. 11754-11759

研究助成金:

• JSPS KAKENHI JP1A24K014270 (水素の超臨界流体相で生じるオルソ-パラ転換)
• NIMS連携拠点推進制度 2025-073 (水素のオルソ-パラ転換をもたらす高密度超臨界流体相の探索)

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1021/acs.jpclett.6c02439

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更新時刻: 2026-10-16 14:15:02 +0900

MDRでの公開時刻: 2026-10-19 10:30:06 +0900