Fukui K, Ogasawara H, Harada I, Kotani A
Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba, Japan.
J Synchrotron Radiat. 2001 Mar 1;8(Pt 2):407-9. doi: 10.1107/s0909049500015569.
We study the resonant x-ray emission spectroscopy (RXES) and the magnetic circular dichroism (MCD) at the L2,3 absorption edges of rare-earth elements, especially gadolinium ion. To this end, an atomic model is adopted and the multiplet coupling effect is taken into account. Using the formula of the coherent second order optical process which consists of the excitation process from the 2p core state to the empty 5d state and of the radiative decay from the 3d core state to the 2p core hole, we calculate RXES-MCD spectra. By inspection, we have confirmed that the enhancement of the 2p-5d dipole matrix element proposed for MCD of x-ray absorption spectroscopy. In addition, characteristic features of the spectra observed in gadolinium metallic compounds are reproduced by our calculations.
我们研究了稀土元素（特别是钆离子）在L2,3吸收边处的共振X射线发射光谱（RXES）和磁圆二色性（MCD）。为此，采用了一个原子模型并考虑了多重态耦合效应。利用由从2p芯态到空的5d态的激发过程以及从3d芯态到2p芯空穴的辐射衰变组成的相干二阶光学过程的公式，我们计算了RXES-MCD光谱。通过检查，我们证实了为X射线吸收光谱的MCD所提出的2p-5d偶极矩矩阵元的增强。此外，我们的计算再现了在钆金属化合物中观察到的光谱特征。
