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首页> 外文期刊>Journal of Experimental and Theoretical Physics >Resonant scattering of an X-ray photon by a heavy atom
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Resonant scattering of an X-ray photon by a heavy atom

机译：重原子对X射线光子的共振散射

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The influence of many-body and relativistic effects on the absolute values and shape of the double differential cross section for the resonant scattering of a linearly polarized X-ray photon by a free xenon atom near the K-shell ionization threshold has been theoretically analyzed. The evolution of the spatially extended structure of the scattering cross section to the K (alpha, beta) structure of the X-ray spectrum of the xenon atom emission has been demonstrated. The calculations have been performed in the dipole approximation for the anomalous dispersion component of the total inelastic scattering amplitude and in the impulse approximation for the contact component of this amplitude. The contribution of the Rayleigh (elastic) scattering component is taken into account using the methods developed in Hopersky et al., J. Phys. B 30, 5131 (1997). The effects of the radial relaxation of the electron shells, spin-orbit splitting, double excitation/ionization of the atomic ground state, as well as the Auger and radiative decays of the produced main vacancies, are considered. Using the results obtained by Tulkki, Phys. Rev. A 32, 3153 (1985) and Biggs et al., At. Data Nucl. Data Tables 16, 201 (1975), the nonrelativistic Hartree-Fock wavefunctions are changed to the relativistic Dirac-Hartree-Fock wavefunctions of the single-particle scattering states when constructing the process probability amplitude. The calculations are predicting and are in good agreement with the synchrotron experiment on the measurement of the absolute values and shape of the double differential cross section for the resonant scattering of an X-ray photon by a free xenon atom reported by Czerwinski et al., Z. Phys. A 322, 183 (1985).
机译：从理论上分析了多体效应和相对论效应对线性微分X射线光子在K壳电离阈值附近的自由氙原子共振散射产生的双微分截面的绝对值和形状的影响。已经证明了散射截面的空间扩展结构演变为氙原子发射的X射线光谱的K（α，β）结构。对于总非弹性散射振幅的反常色散分量，以偶极近似进行计算;对于该振幅的接触分量，以脉冲近似进行计算。使用Hopersky等人在J. Phys.Lett。 B 30，5131（1997）。考虑了电子壳径向弛豫，自旋轨道分裂，原子基态的双重激发/电离以及所产生的主要空位的俄歇和辐射衰变的影响。使用Tulkki，Phys。 Rev.A 32，3153（1985）和Biggs等，At。数据核在数据表16，201（1975）中，当构造过程概率振幅时，非相对论性Hartree-Fock波函数被更改为单粒子散射状态的相对论Dirac-Hartree-Fock波函数。计算是预测性的，并且与同步加速器实验有关，该实验用于测量Czerwinski等人报道的由游离氙原子共振散射X射线光子引起的X射线光子共振散射的绝对值和双微分截面形状， Z.物理A 322，183（1985）。

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