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Electrones parcialmente hidratados en la interfaz aire/agua observados por espectroscopia de generación de frecuencia

Korenobu Matsuzaki^1,2, Ryoji Kusaka¹, Satoshi Nihonyanagi^1,3

¹Molecular Spectroscopy Laboratory, RIKEN , 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.

Journal of the American Chemical Society

|June 10, 2016

Resumen

Los investigadores observaron electrones hidratados en la interfaz aire/agua utilizando espectroscopia avanzada. Estos electrones solo están parcialmente hidratados y escapan al agua a granel en 100 picosegundos.

Área de la Ciencia:

Química Física
Ciencias de la superficie
Espectroscopia

Sus antecedentes:

Los electrones hidratados son aniones fundamentales en soluciones acuosas.
Su existencia y propiedades en la superficie del agua siguen siendo objeto de debate.
Comprender el comportamiento interfacial de los electrones es crucial para varios procesos químicos.

Objetivo del estudio:

Observar y caracterizar los electrones hidratados en la interfaz aire/agua.
Investigar la estructura de la solvación y la dinámica de los electrones interfaciales.
Para resolver la controversia que rodea los electrones hidratados en las superficies.

Principales métodos:

Se utilizó la espectroscopia vibratoria no lineal selectiva de interfaz con resolución temporal.
Generación de frecuencia de suma vibratoria empleada con detección heterodina (HD-VSFG).
Electrones generados en la interfaz aire/agua a través de la fotoirradicación ultravioleta.

Principales resultados:

Se observó una fuerte banda transitorio en la región de estiramiento OH en la generación de electrones.
Asigna la banda transitorio a las moléculas de solvataje de agua en la interfaz.
Determinado que los electrones interfaciales están parcialmente hidratados.
Descubrió que los electrones escapan al agua en masa en 100 picosegundos.

Conclusiones:

Se ha proporcionado evidencia directa de electrones hidratados en la interfaz aire/agua.
Caracterizó la hidratación parcial y la dinámica rápida de los electrones interfaciales.
Los hallazgos resuelven preguntas de larga data sobre el comportamiento de los electrones en superficies acuosas.

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