characteristic X-ray
characteristic X-ray
When one of inner-shell electrons is excited, an electron vacancy is formed in the inner-shell states. Then, an outer-shell electron, whose energy level is higher than that of the inner-shell electron, falls on the vacancy while emitting X-rays. The energy of the emitted X-rays corresponds to the energy difference between the outer-shell electron and the inner-shell electron. The emitted X-rays are called "characteristic X-ray(s)" and are characteristic of individual atoms. The characteristic X-rays are utilized for qualitative and quantitative element analysis on a micro-area.
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