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Published on: February 5, 2017
Microscopía electrónica ultrarrápida de escaneo 4D: visualización de la dinámica de la superficie de los materiales.
Omar F Mohammed1, Ding-Shyue Yang, Samir Kumar Pal
1Physical Biology Center for Ultrafast Science and Technology, Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, California 91125, USA.
Journal of the American Chemical Society
|May 5, 2011
Resumen
La microscopía electrónica ultrarrápida de barrido (S-UEM) logra una alta resolución espacio-temporal para el estudio de la dinámica de la superficie del material. Este nuevo método supera las limitaciones de los microscopios electrónicos de barrido (SEM) convencionales para la investigación ultrarrápida.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- Ciencias de la superficie Ciencias de la superficie.
- El microscopio de la microscopía.
Sus antecedentes:
- Los microscopios electrónicos de barrido (MEB) convencionales tienen una resolución temporal limitada.
- El estudio de la dinámica ultrarrápida de las superficies de los materiales requiere una alta resolución temporal.
Objetivo del estudio:
- Desarrollar microscopía electrónica ultrarrápida de barrido (S-UEM) para estudios con resolución temporal.
- Para lograr una alta resolución en el espacio y el tiempo para la dinámica de la superficie.
Principales métodos:
- Desarrollado S-UEM utilizando paquetes de electrones fotogenerados de una punta de emisor de campo.
- Utilizó un bajo recuento de electrones para minimizar la repulsión de carga espacial y mejorar la resolución temporal.
- Se mantuvo la resolución espacial de SEM para la visualización espacio-temporal.
Principales resultados:
- S-UEM demostrado para investigar la dinámica en materiales semiconductores y metálicos.
- Logró una resolución temporal ultrarrápida, órdenes de magnitud mejores que los métodos tradicionales.
- Visualización habilitada de la dinámica de la superficie después de la excitación del femtosegundo.
Conclusiones:
- S-UEM ofrece una resolución espacio-temporal sin precedentes para la ciencia de los materiales.
- La técnica es capaz de visualizar dinámicas superficiales ultrarrápidas.
- Existen aplicaciones potenciales en ciencias de los materiales y ciencias biológicas.
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