论文标题
衍射光栅具有两级量子增强的色散速率
Diffraction gratings with two-orders-of-magnitude-enhanced dispersion rates for sub-meV-resolution soft x-ray spectroscopy
论文作者
论文摘要
具有较大角度分散率的衍射光栅对于在从红外到软X射线域的广泛光谱范围内的光谱仪中获得高光谱分辨率至关重要。当然，最大的挑战是要在短波X射线域中实现较大的分散率。在这里，我们表明，非对称X射线bragg衍射中的晶体可以充当高反射性软X射线衍射光栅，其分散率至少比具有最先进的人造的光栅的分散率至少要大两个数量级。这为设计和实施柔软的X射线谐振非弹性散射（RIX）光谱仪提供了新的机会，具有光谱分辨率，这些分辨率比当前可能的高度高两个数量级，以进一步提高RIXS光谱的非常动态的领域，并使IT与弹性中子散射具有竞争力。我们介绍了在Cu中的930-EV L $ _3 $吸收边缘和2.838-Kev l $ _3 $ _3 $ edge的RU中的930-EV L $ _3 $吸收边缘附近运行的大差异水晶衍射光栅的示例。
Diffraction gratings with large angular dispersion rates are central to obtaining high spectral resolution in grating spectrometers operating over a broad spectral range from infrared to soft-x-ray domains. The greatest challenge is of course to achieve large dispersion rates in the short-wavelength x-ray domain. Here we show that crystals in non-coplanar asymmetric x-ray Bragg diffraction can function as high-reflectance soft-x-ray diffraction gratings with dispersion rates that are at least two orders of magnitude larger than those that are possible with state-of-the-art man-made gratings. This opens new opportunities to design and implement soft x-ray resonant inelastic scattering (RIXS) spectrometers with spectral resolutions that are up to two orders of magnitude higher than what is currently possible, to further advance a very dynamic field of RIXS spectroscopy, and to make it competitive with inelastic neutron scattering. We present examples of large-dispersion-rate crystal diffraction gratings operating near the 930-eV L$_3$ absorption edge in Cu and of the 2.838-keV L$_3$ edge in Ru.
