Abstract Infrared (IR)-visible (Vis) sum frequency generation (SFG) is a second-order
nonlinear optical process which is forbidden in centrosymmetric bulk media or isotropic …

Amino acids make up a promising family of molecules capable of direct air capture (DAC) of
CO2 from the atmosphere. Under alkaline conditions, CO2 reacts with the anionic form of an …

Aqueous glycine plays many different roles in living systems, from being a building block for
proteins to being a neurotransmitter. To better understand its fundamental behavior, we …

Controlling site-selectivity and reactivity in chemical reactions continues to be a key
challenge in modern synthetic chemistry. Here, we demonstrate the discovery of site …

In the course of our investigations of the adsorption of ions to the air–water interface, we
previously reported the surprising result that doubly charged carbonate anions exhibit a …

Second-order nonlinear processes like Sum-Frequency Generation (SFG) are essentially
defined in the electric dipolar approximation. However, when dealing with the SFG …

Vibrational sum-frequency generation (VSFG) has become a powerful tool for investigating
the molecular structure of surfaces and interfaces. One aspect of the technique that has …

Small molecules or proteins interact with a biomembrane in various ways for molecular
recognition, structure stabilization, and transmembrane signaling. In this study, 1, 2 …

Vibrational sum frequency generation can provide valuable structural information at surfaces
and buried interfaces. Relating the measured spectra to the complex-valued second-order …

Langmuir monolayers of fatty aniline (C16-aniline) were investigated using sum-frequency
vibrational spectroscopy at various pH levels and NaCl concentrations. To analyze the sum …