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Why M-type cathode has higher emission performance? This is an undecided important problem for over 20 years. In this article, SRPES is used to study the chemical state of O on the surface of cathodes coated with Os or W film. It can be found that Ba/O and the content of low binding energy O species on the cathode surface coated with Os film are higher than that on W coated film remarkably. It is...
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