P-29: X-Ray Absorption of Oxide Cathode Emission Materials

Soft-X-ray absorption spectroscopy was used to identify the chemical structure of oxide cathode emission materials. High energy resolution spectra of the Ba 3d absorption edge revealed that the free Ba content significantly increased on the surface of oxide cathodes down to several tens of nanometers in depth after activation process. This result gives clear evidence of free Ba formation on the surface of cathode spray layers.