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¿Reacciones químicas de la superficie del gas a altas energías de colisión?
Michael J Gordon1, Xiangdong Qin, Alex Kutana
1Department of Chemical Engineering, University of California Santa Barbara, California 93106-5080, USA.
Journal of the American Chemical Society
|February 5, 2009
Resumen
Los impactos de iones de flúor energéticos (F(+)) en superficies fluoradas crean moléculas ultra rápidas F(2)). Este nuevo mecanismo de varios pasos genera productos hipertermales con alta energía cinética.
Área de la Ciencia:
- Ciencias de la superficie Ciencias de la superficie.
- Física Química Física Química es el campo de la física química.
- Ciencia de los materiales ciencia de los materiales.
Sus antecedentes:
- Las reacciones gas-superficie generalmente producen productos de baja energía.
- Los proyectiles energéticos pueden inducir la formación de productos hipertermales.
Objetivo del estudio:
- Para investigar la formación de productos moleculares ultrarrápidos a partir del bombardeo energético de iones de las superficies.
- Para aclarar el mecanismo detrás de la producción hipertermal de F.
Principales métodos:
- Bombardeo de superficies de plata fluorada (Ag) y silicio (Si) con iones de flúor (F(+)) a energías que oscilan entre 30-300 eV.
- Análisis de la energía cinética de los productos moleculares resultantes.
Principales resultados:
- Descubrimiento de productos moleculares "ultra rápidos" F(2)(-) con energías de salida de hasta 90 eV.
- Identificación de un mecanismo de reacción directa en varios pasos responsable de la formación de productos hipertermales.
- Confirmación de que el átomo F del proyectil está incorporado en el producto rápido F.
Conclusiones:
- El bombardeo energético de F (((+) puede impulsar la formación de F (((2)) hipertermal a través de un nuevo mecanismo de varios pasos.
- Este proceso permite la creación de productos moleculares de alta energía incluso cuando la energía de impacto excede las energías de enlace típicas.
- Los hallazgos desafían la comprensión convencional de la dinámica de reacción gas-superficie bajo condiciones energéticas.
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