期刊
PHYSICAL REVIEW LETTERS
卷 85, 期 18, 页码 3854-3857出版社
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.85.3854
关键词
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IR-visible sum-frequency generation(SFG) spectroscopy has been used in a total internal reflection geometry to study the molecular structure of polystyrene (PS) at PS/sapphire and PS/air interfaces, simultaneously. The symmetric vibrational modes of the phenyl rings dominate the SFG spectra at the PS/air interface as compared to the antisymmetric vibrational modes at the PS/sapphire interface. This indicates approximately parallel orientation of the phenyl rings at the PS/air interface while nearly perpendicular orientation at the PS/sapphire interface, with respect to the surface normal.
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