Spectroscopy and Imaging of Compton Scattering X-rays

Dear Colleagues,

An energy spectrum of Compton scattered X-rays probes an electron momentum distribution in a material. The electron momentum distribution reflects the wavefunction in momentum, which is a Fourier transform of wavefunction in real space. Because wavefunction has the same symmetry in both the real space and momentum space, the Compton scattering experiment probes the Fermi surface and/or shape of chemical bonding in momentum space. In other words, the Compton scattering experiment probes quantum state imaging in momentum space.

Compton scattering experiments have played a role in catching quantum states, where the characteristic properties of material occur, for double perovskite manganite, high-temperature super conductor, dense Kondo materials, and so on. Recently, quantum-state imaging in momentum space for cathode materials of a Li-ion battery has been reported, which suggests possible directions for material design to achieve high capacity and long battery life.

Recent progress in synchrotron facilities has made it possible to use polarization controlled X-rays. Compton scattering experiments with circularly polarized X-rays, often called magnetic Compton scattering, probe spin resolved quantum states in a material. Quantum states, which occur perpendicular to magnetic anisotropy, have been reported for nanostructured multilayer by magnetic Compton scattering experiments. Furthermore, spin/orbital specific magnetic hysteresis curve, element specific magnetic hysteresis curve, and magnetic quantum number specific magnetic hysteresis curve measurements by magnetic Compton scattering experiments have been reported for perpendicular, magnetic recording materials, and spintronics materials.

Recently, Li-ion reaction distribution imaging in real space for commercial Li-ion batteries has been reported by Compton scattering experiments as a novel non-destructive test (NDT) technique. This activity may open “chemical state imaging” in operando.

This volume will cover recent research on Compton scattering X-ray applications.

Prof. Dr. Hiroshi Sakurai
Dr. Kosuke Suzuki
Guest Editors

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