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The interference of a photon due to different possible paths from the emitting atom to the detector leads to intereference effects analogue to the XSW in GIXRF.
WIth an energy-dispersive pixel detector GEXRF can be performed scan-free.

As in GIXRF, interference patterns in the detected fluorescence intensities can also occur in the case of GEXRF if the interfaces of the sample are smooth. In GEXRF geometry, the fluorescence radiation can be reflected at the sample interfaces and interference due to different detection pathways can occur (also known as Kossel effect). Interestingly, the effect appears also if single photons are detected, e.g. with a conventional CCD camera. Thus, those measurements make direct use of the wave-particle dualism, as it was nicely demonstrated by Thomas Young’s double slit experiment with electrons.

Although inherently less efficient than GIXRF, the scanning-free GEXRF approach in combination with single photon detection and the advent of novel X-ray sensitive CMOS detectors might boost further development in this technique.

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