A nonrelativistic variant of the quantum theory for the resonant inelastic-scattering process of two x-ray photons in the deep -shell ionization threshold energy region of a free many-electron atom is established. A quantitative estimate for the magnitude of the observed differential cross section is given.
DOI:https://doi.org/10.1103/PhysRevA.98.063424
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Partial probability amplitudes for the resonant inelastic scattering of two XFEL photons by the Zn atom in the Feynman diagram representation. Right arrow is the electron , left arrow is the vacancy . Light (dark) circle shows interaction vertex over the contact (radiative) transition operator. Double line shows the state obtained in the Hartree–Fock field of the vacancy. is the incident (scattered) photon. Time direction for the process is .
Reuse & PermissionsDifferential cross section for the resonant inelastic scattering of two XFEL photons by the Zn atom in the -emission region. eV. is the energy of the incident (scattered) photon. Spectral characteristics of the discrete spectrum resonances are given in Table 1.
Reuse & PermissionsSame as in Fig. 2, but for a fixed value of eV. Solid curve: and operators and the monopole rearrangement effect (MRE) are taken into account. Dashed curve: operator and MRE are taken into account. Dashed-dot curve: and operators but not MRE are taken into account.
Reuse & PermissionsWeisskopf–Wigner effect during the resonant inelastic scattering of two XFEL photons by the Zn atom in the region of (a) and (b) emission. eV, eV, eV. is the energy of the incident (scattered) photon.
Reuse & Permissions
