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】
Free