Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 104, Issue 14, Pages 3349-3354Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp9933929
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An experiment was designed to measure sum-frequency generation (SFG) spectra in both reflection and transmission. The result from an octadecyltrichlorosilane monolayer on a substrate reveals that while the resonant spectra in the two geometries both originate from the surface monolayer, the bulk substrate has a significant contribution to the nonresonant background in the transmitted spectra. Study of a polyethylene film also shows that the bulk contribution to the SFG spectra is only significant for the transmission geometry, exhibiting a resonant mode not observable in the reflected spectra.
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