Surface sum-frequency vibrational spectroscopy of nonpolar media.
basic_science · Level V
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- Record sourced from PubMed, PMID 25918404.
- Also identified by DOI 10.1073/pnas.1505438112 and PMC identifier 4434775.
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Abstract
Sum-frequency generation spectroscopy is surface specific only if the bulk contribution to the signal is negligible. Negligible bulk contribution is, however, not necessarily true, even for media with inversion symmetry. The inevitable challenge is to find the surface spectrum in the presence of bulk contribution, part of which has been believed to be inseparable from the surface contribution. Here, we show that, for nonpolar media, it is possible to separately deduce surface and bulk spectra from combined phase-sensitive sum-frequency vibrational spectroscopic measurements in reflection and transmission. The study of benzene interfaces is presented as an example.