El rol de la función de transferencia de contraste en la formación de imágenes de resolución atómica de nanopartículas
Resumen
Los resultados de microscopia electrónica de transmisión de alta resolución pueden ser cuantitativamente interpretados si se realizan los ajustes necesarios de la óptica-electrónica del instrumento para la adquisición de las imágenes de resolución atómica. En el marco de este trabajo se describe cualitativamente los principios de la formación de imágenes en términos de la difracción de electrones y óptica electrónica. Al final del proceso se resume a la función de transferencia de contraste (FTC) y desenfoque de la imagen del objeto. La manipulación cuidadosa del desenfoque permite controlar la FTC para conseguir contraste de fase más fuerte de los espaciados interplanares de la red cristalina de la partícula bajo estudio. El contraste que se puede lograr es brillante u oscuro en el lado del desenfoque negativo antes del valor de desenfoque de Scherzer. Contrastes oscuros de clusters de WOx sobre contraste brillantes de la red m-ZrO2 pudo ser evidenciado a través de la manipulación controlada y precisa del desenfoque.
Citas
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