X-ray spectroscopy X-ray emission spectroscopy XRF spectroscopy X-ray emission spectrometry X-ray fluorescence spectrometry X-ray fluorescence spectroscopy XRF XRF spectrometry CHMO:0000307 X-ray spectroscopy where the sample is bombarded with X-rays or particles and the energies and intensities of the X-rays emitted due to core-to-core transitions (known as 'X-ray fluorescence') are detected. XRES XES