中国物理B ›› 2020, Vol. 29 ›› Issue (10): 103101-.doi: 10.1088/1674-1056/abab6d

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Wan-Run Jiang(姜万润)1, Rui Wang(王瑞)1, Xue-Guang Ren(任雪光)2, Zhi-Yuan Zhang(张志远)1, Dan-Hui Li(李丹慧)1, Zhi-Gang Wang(王志刚)1,†‡   

  • 收稿日期:2020-03-23 修回日期:2020-07-22 接受日期:2020-08-01 出版日期:2020-10-05 发布日期:2020-10-05
  • 通讯作者: Zhi-Gang Wang(王志刚)

Zero-point fluctuation of hydrogen bond in water dimer from ab initio molecular dynamics

Wan-Run Jiang(姜万润)1,†, Rui Wang(王瑞)1,†, Xue-Guang Ren(任雪光)2, Zhi-Yuan Zhang(张志远)1, Dan-Hui Li(李丹慧)1, and Zhi-Gang Wang(王志刚)1,‡   

  1. 1 Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China
    2 School of Science, Xi’an Jiaotong University, Xi’an 710049, China
  • Received:2020-03-23 Revised:2020-07-22 Accepted:2020-08-01 Online:2020-10-05 Published:2020-10-05
  • Contact: These authors contributed equally to this work. Corresponding author. E-mail: wangzg@jlu.edu.cn
  • About author:
    †Corresponding author. E-mail: wangzg@jlu.edu.cn
    * Project supported by the National Natural Science Foundation of China (Grant Nos. 11974136 and 11674123).

Abstract:

Dynamic nature of hydrogen bond (H-bond) is central in molecular science of substance transportation, energy transfer, and phase transition in H-bonding networks diversely expressed as solution, crystal, and interfacial systems, thus attracting the state-of-the-art revealing of its phenomenological edges and sophisticated causes. However, the current understanding of the ground-state fluctuation from zero-point vibration (ZPV) lacks a firm quasi-classical base, concerning three basic dimensions as geometry, electronic structure, and interaction energy. Here, based on the ab initio molecular dynamics simulation of a ground-state water dimer, temporally separated fluctuation features in the elementary H-bond as the long-time weakening and the minor short-time strengthening are respectively assigned to two low-frequency intermolecular ZPV modes and two O–H stretching ones. Geometrically, the former modes instantaneously lengthen H-bond up to 0.2 Å whose time-averaged effect coverages to about 0.03 Å over 1-picosecond. Electronic-structure fluctuation crosses criteria’ borders, dividing into partially covalent and noncovalent H-bonding established for equilibrium models, with a 370% amplitude and the district trend in interaction energy fluctuation compared with conventional dragging models using frozen monomers. Extended physical picture within the normal-mode disclosure further approaches to the dynamic nature of H-bond and better supports the upper-building explorations towards ultrafast and mode-specific manipulation.

Key words: zero-point vibration, hydrogen bond, normal mode, ab initio molecular dynamics

中图分类号:  (Theory of electronic structure, electronic transitions, and chemical binding)

  • 31.10.+z
82.30.Rs (Hydrogen bonding, hydrophilic effects) 34.50.Ez (Rotational and vibrational energy transfer)