Atomic transition

In atomic physics and chemistry, an atomic electron transition (also called an atomic transition, quantum jump, or quantum leap) is an electron changing from one energy level to another within an atom or artificial atom. These energy levels are discrete, quantized, and obtain unique energy gaps specific to a given atom. Though not an exhaustive list, energy-dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS) are a few of the many characterization techniques that employ the "atomic fingerprint" phenomenon of atomic electron transitions obtained by the unique quantized energy levels to identify atomic presence and relative composition within samples.