Sum-frequency spectroscopic studies of ice interfaces

Article

关键词: VIBRATIONAL SPECTROSCOPY;    2ND-HARMONIC GENERATION;    SURFACE STRUCTURE;    PHASE-TRANSITION;    RAMAN-SPECTRUM;    DIPOLE-MOMENT;    QUASI-LIQUID;    WATER;    CRYSTAL;    LAYER;   

DOI  :  10.1103/PhysRevB.66.085401

来源: SCIE

【 摘 要 】

Sum-frequency vibrational spectroscopy was used to study the (0001) surface of hexagonal ice (I-h) in contact with: air, a hydrophobic substrate, and a hydrophilic substrate. The spectra in the O-H stretch frequency range were obtained at various temperatures. For the air/ice interface, the degree of orientational order of the dangling OH bonds at the surface was measured as a function of temperature. Surface disordering appears to set in around 200 K and increases dramatically with temperature, which is a strong indication of the presence of surface melting of ice. For the hydrophobic and hydrophilic ice interfaces, a similar temperature dependence of the hydrogen-bonded OH stretch peak was observed. The free OH stretch mode, however, appears to be different from that of the air/ice interface due to the interactions with substrates at the interfaces.

【 授权许可】

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