Direct Evidence for a Surface and Bulk Specific Response in the Sum-Frequency Generation Spectrum of the Water Bend Vibration
Carolyn J. Moll, Jan Versluis, H. J. Bakker
Abstract
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.
Topics & Concepts
DipoleSum frequency generation spectroscopyBendingSum-frequency generationSpectroscopyMolecular vibrationVibrationPhysicsAqueous solutionMolecular physicsFrequency shiftAtomic physicsMaterials scienceAnalytical Chemistry (journal)OpticsPhysical chemistryChemistryQuantum mechanicsNonlinear opticsThermodynamicsRaman spectroscopyChromatographyLaserSpectroscopy and Quantum Chemical StudiesMolecular spectroscopy and chiralitySpectroscopy and Laser Applications