Consequences of Kramers-Kronig relations on Kleinman antisymmetric spectral observables: Chiral-specific sum frequency generation spectroscopy.

ABSTRACT: Investigating water structures at aqueous interfaces has been a central focus in the field of nonlinear surface spectroscopy over decades. This large body of work leads to a conclusion that asymmetric OH stretches should be largely silent in sum frequency generation (SFG) spectra. Nonetheless, our recent studies show chiral-specific SFG response of water originating from the first hydration shell of proteins and DNA arising from a sum of equal-magnitude and opposite-phase symmetric and asymmetric OH stretches, resulting in an oppositely signed couplet. Motivated initially by this apparently inconsistent behavior for chiral-specific vs conventional (achiral) SFG, we demonstrate herein a fundamental argument for the appearance of the oppositely signed couplets in chiral-specific vibrational

SUBMITTER: Tremblay M 

PROVIDER: S-EPMC12694613 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature