Direct Evidence for a Surface and Bulk Specific Response in the Sum-Frequency Generation Spectrum of the Water Bend Vibration

Back to all publications

Publication date
DOI http://dx.doi.org/10.1103/physrevlett.127.116001
Reference C.J. Moll, J. Versluis and H.J. Bakker, Direct Evidence for a Surface and Bulk Specific Response in the Sum-Frequency Generation Spectrum of the Water Bend Vibration, Phys.Rev.Lett. 127, 11: 116001: 1-6 (2021)
Group Ultrafast Spectroscopy

We study the bending mode of pure water and charged aqueous surfaces using heterodyne-detected vibrational sum-frequency generation spectroscopy. We observe a low (1626  cm−1) and a high (1656  cm−1) frequency component that can be unambiguously assigned to an interfacial dipole and a bulk quadrupolar response, respectively. We thus demonstrate that probing the bending mode provides structural and quantitative information on both the surface and the bulk.