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<p>Dangling OH bonds on ice surfaces are thought to play a central role in surface reactions relevant to planetary, interstellar, and prebiotic environments, yet their direct characterization is hindered by the intrinsic fragility of surface hydrogen-bonding networks, particularly under phase transition conditions. Here, using time-resolved in situ infrared reflection-absorption spectroscopy, we track the evolution of dangling OH bonds during the isothermal crystallization of amorphous solid water into ice I. We observe a transient excess of dangling OH bonds that gradually diminishes as the surface hydrogen-bonding networks reorganize, reflecting competition between nucleation-driven crystallization and surface stabilization. These findings provide direct spectroscopic evidence for a metastable surface state formed during amorphous solid water crystallization and uncover a surface-restructuring pathway that may influence the reactivity of icy surfaces.</p>

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Formation of excess dangling OH bonds during crystallization of amorphous solid water

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年5月14日

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  • Linbo Li,
  • Min Lin,
  • Yitian Cao,
  • Haihong Zheng,
  • Jianghui Liu,
  • Yibin Wang,
  • Jiani Hong,
  • HongYing Mao,
  • Haishan Cao,
  • Jian-Qiang Zhong

摘要

Dangling OH bonds on ice surfaces are thought to play a central role in surface reactions relevant to planetary, interstellar, and prebiotic environments, yet their direct characterization is hindered by the intrinsic fragility of surface hydrogen-bonding networks, particularly under phase transition conditions. Here, using time-resolved in situ infrared reflection-absorption spectroscopy, we track the evolution of dangling OH bonds during the isothermal crystallization of amorphous solid water into ice I. We observe a transient excess of dangling OH bonds that gradually diminishes as the surface hydrogen-bonding networks reorganize, reflecting competition between nucleation-driven crystallization and surface stabilization. These findings provide direct spectroscopic evidence for a metastable surface state formed during amorphous solid water crystallization and uncover a surface-restructuring pathway that may influence the reactivity of icy surfaces.