Sum frequency generation, calculation of absolute intensities, comparison with experiments, and two-field relaxation-based derivation.

ABSTRACT: The experimental sum frequency generation (SFG) spectrum is the response to an infrared pulse and a visible pulse and is a highly surface-sensitive technique. We treat the surface dangling OH bonds at the air/water interface and focus on the absolute SFG intensities for the resonant terms, a focus that permits insight into the consequences of some approximations. For the polarization combinations, the calculated linewidths for the water interface dangling OH SFG band at 3,700 [Formula: see text] are, as usual, too large, because of the customary neglect of motional narrowing. The integrated spectrum is used to circumvent this problem and justified here using a Kubo-like formalism and theoretical integrated band intensities rather than peak intensities. Only relative SFG intensities are usu

SUBMITTER: Niu K 

PROVIDER: S-EPMC7022212 | biostudies-literature | 2020 Feb

REPOSITORIES: biostudies-literature