期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 8, 期 7, 页码 1396-1401出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.7b00312
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资金
- JSPS KAKENHI [JP15K13616, JP15KT0056, JP25104005]
- Grants-in-Aid for Scientific Research [15K13616, 25104005, 15KT0056] Funding Source: KAKEN
Unraveling vibrational coupling is the key to consistently interpret vibrational spectra of complex molecular systems. The vibrational spectrum of the water surface heavily suffers from vibrational coupling, which hinders complete understanding of the molecular structure and dynamics of the water surface. Here we apply heterodyne detected sum frequency generation spectroscopy to the water surface and accomplish the assignment of a weak vibrational band located at the lower energy side of the free OH stretch. We find that this band is due to a combination mode of the hydrogen-bonded OH stretch and a low-frequency intermolecular vibration, and this combination band appears in the surface vibrational spectrum through anharmonic vibrational coupling that takes place exclusively at the topmost surface.
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