High Resolution Imaging, Spectroscopy and Nuclear Quantum Effects of Interfacial Water

This thesis presents a series of experimental techniques based on scanning probe microscopy, which make it possible access the degree of freedom of protons both in real and energy space. These novel techniques and methods allow direct visualization of the concerted quantum tunneling of protons within the hydrogen-bonded network and quantification of the quantum component of a single hydrogen bond at a water–solid interface for the first time. Furthermore, the thesis demonstrates that the anharmonic quantum fluctuations of hydrogen nuclei further weaken the weak hydrogen bonds and strengthen the strong ones. However, this trend was reversed when the hydrogen bond coupled to the local environment. These pioneering findings substantially advance our understanding of the quantum nature of H bonds at the molecular level.

• Scanning tunneling microscopy
• Inelastic electron tunneling spectroscopy
• Vibrational spectroscopy
• Nuclear quantum effects
• Proton tunneling
• Zero point motion

• School of Physics, International Center for Quantum Materials, Peking University, Beijing, China

  Jing Guo

Jing Guo grew up in Henan Province, China and received her B.S. in Physics from Lanzhou University, China in 2011. Under the supervision of Prof. Ying Jiang, she obtained her Ph.D. from the School of Physics, Peking University in July 2016. Subsequently, she became a postdoc fellow in the same group and continued to investigate the structure and dynamics of interfacial ice on various substrates.

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