Development of magnetic circular dichroism in high-resolution X-ray absorption and emission spectroscopy and clarification of the mechanism for multielectron excitations

激发态是一种高能态，通过吸收材料中的光（光子）而形成。在X射线区观察到多电子激发，即一个光子激发两个电子，但对于Mn和Fe等元素，这种几率很小。最近，高亮度同步辐射使我们能够观察到多电子激发现象。为了阐明多电子激发的机制，研制了一种新的谱仪--高能量分辨率X射线发射谱仪，并成功地进行了高精度的谱测量。所获得的信号没有预期的那么大。然而，我们希望这些结果在未来的多电子激发机制的阐明中发挥重要作用。

An excited state, which is a high-energy state, is formed by absorption of light(photon) in materials. The multielectron excitations, whose state means two electrons are excited by one photon, is observed in X-ray region, but the probability is very small for the elements such as Mn and Fe atoms. Recently, high-brilliant synchrotron radiation enables us to observe the phenomenon of multielectron excitations. To clarify the mechanism of multielectron excitations, a new spectrometer, a high-energy resolution X-ray emission spectrometer, was developed and a measurement of the spectra with high precision was successful. The obtained signal is not so large as expected. However, it is expected that the results play an important role to clarify the mechanism of multielectron excitations in the future.