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Espectro de absorción de rayos X de borde cercano para el Cu y el Mn metálicos

G N Greaves, P J Durham, G Diakun

|February 17, 2018

Resumen

Los espectros de absorción de rayos X de alta resolución cerca de la estructura del borde (XANES) revelan diferencias detalladas de la estructura atómica local en metales de cobre y manganeso. El análisis utilizando la nueva teoría de dispersión múltiple confirma la sensibilidad de XANES a la disposición atómica.

Área de la Ciencia:

Ciencias de los materiales
Física del estado sólido
Espectroscopia de rayos X

Sus antecedentes:

La estructura fina de absorción de rayos X (XAFS) incluye la estructura fina de absorción de rayos X extendida (EXAFS) y la estructura de absorción de rayos X cerca del borde (XANES).
Las fuentes de rayos X intensas como los anillos de almacenamiento han mejorado EXAFS, pero la resolución XANES a veces ha disminuido.
Recientemente se ha desarrollado una nueva teoría de dispersión múltiple para el análisis XANES.

Objetivo del estudio:

Para presentar los primeros espectros XANES de alta resolución para metales de cobre (Cu) y manganeso (Mn).
Investigar la sensibilidad de XANES a las diferencias sutiles en la estructura atómica local.
Analizar los espectros XANES obtenidos utilizando un nuevo enfoque teórico de dispersión múltiple.

Principales métodos:

Adquisición de espectros XANES de alta resolución para Cu y Mn en el anillo de almacenamiento SRS.
Aplicación de un nuevo formalismo teórico de dispersión múltiple para el análisis espectral.
Comparación de espectros XANES que reflejan las disposiciones atómicas locales.

Principales resultados:

Se obtuvieron con éxito espectros XANES de alta resolución para Cu y Mn.
Se observaron diferencias significativas en los espectros de XANES entre Cu y Mn.
La nueva teoría de dispersión múltiple analizó efectivamente los espectros XANES, correlacionándolos con la estructura atómica local.

Conclusiones:

XANES es muy sensible a la detallada estructura atómica local de los metales.
La nueva teoría de dispersión múltiple proporciona una herramienta poderosa para analizar XANES, independiente de la periodicidad de largo alcance.
Este trabajo demuestra la capacidad de las técnicas avanzadas de espectroscopia de rayos X para sondear detalles estructurales a nivel atómico.

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