X-ray excitation generally result in two types of photons (x-ray photons and uv-vis photons) emitted. The emitted x-ray photons are from core levels are measured in X-ray fluorescence (XRF) spectroscopy. XRF is used for qualitative and quantitative identification of elements. It is a very fast, versatile and high sensitivity technique used in many areas of research. The uv-vis or optical photons are low energy emission that could originate from band gap or defects transitions. This low energy emission technique is usually termed X-ray Excited Optical Luminescence (XEOL) or scintillation.
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