Acid-Base Equilibrium Constants at the Water Surface and Distribution Coefficients between the Surface and the Bulk as Studied by the Laser Two-Photon Ionization Technique

Article Abstract:

A new method for the determination of the equilibrium between the bulk and surface of pyrenebutyric acid by directly measuring surface concentration using laser two-photon ionization is proposed. The findings that the equilibrium shifts towards the neutral form on the water surface is indicated and laser two-photon ionization is found to be a sensitive and powerful technique to analyze equilibrium on the surface and that between the surface and the bulk is suggested.

Electric properties, Water, Chemistry, Physical and theoretical, Physical chemistry, Phonons, Chemical properties

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Second-harmonic probe of pressure-induced structure ordering within long-chain fluorescein monolayer at the air/water interface

Article Abstract:

Pressure-induced structure ordering of long-chain fluorescein O322 molecules within the monolayer at the air/water interface was studied by rotating a sample trough using the second-harmonic generation technique. The result shows that the transition of an initially disordered and heterogeneous dye monolayer into a fairly regular crystalline-like structure was characterized by continuous changes in the structure ordering of constituent molecules.

Molecular dynamics, Harmonic functions, Fluorescein

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Acid-base equilibrium constants and distribution coefficients of aminopyrene between the surface and bulk of liquid water as studied by a laser two-photon ionization

Article Abstract:

Adsorption of aminopyrene at the water surface is measured using laser two-photon ionization technique. It is shown that neutral aminopyrene tends to stay on the water surface, resulting in equilibrium shifts toward the neutral form.

Analysis, Photons, Atomic properties, Acid-base equilibrium

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