Abstract
Resonant photoemission in narrow-band materials is described by the sum of first-and secondorder transitions, their quantum-mechanical interference leads to an increase in the spectrum from the valence bands and the appearance of an asymmetric dependence on the photon energy. These effects are studied theoretically and experimentally using the example of three-component intermetallic compounds TbNi2Mnx. The competition between the elastic and inelastic photoemission channels leads to a different dependence of photoemission spectra from nickel and manganese on photon energy. The elastic channel is realized on atoms with large magnetic moments, the inelastic Auger decay occurs on atoms with small moments.
Highlights
Effects of superposition and interference of quantum states can be observed in resonance X-ray spectroscopy of solids
An additional channel is opened if the photon energy reaches an excitation edge for a core level
The photon first transfers the electron from the core level to the unoccupied state of the valence band (VB), and the Coulomb interaction by autoionization returns the excited electron back to the core level with the ejection of another VB electron to the free state
Summary
Effects of superposition and interference of quantum states can be observed in resonance X-ray spectroscopy of solids. For the first time such effects were investigated in detail by Hugo Fano [1] in 1961 in connection with experiments on inelastic scattering of electrons by helium atoms. He developed a theory of a resonance with an asymmetric profile, called the Fano resonance, which arises as a result of interference of two wave processes. The photon first transfers the electron from the core level to the unoccupied state of the valence band (VB), and the Coulomb interaction by. The same final state (photoelectron plus a hole in the valence band) is obtained as a result of two types of transitions
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