Studying RIXS at PETRA III with a Soft X-Ray Spectrometer

在过去的几年中，X射线源的亮度有所提高，这主要是因为光子束的光束质量以及能量分辨率和光子数量也有所提高。

消耗大量光子的一种方法是共振的非弹性X射线散射（RIX），该散射特异于元素，位点和轨道，并且对周围环境的化学组成响应。因此，它越来越多地用于研究许多样本，包括软物质。

实验装置

For the current setup, a spectrometer with energy dispersive capability was used. It has an X-ray optical element, namely, a varied line spacing (VLS) grating, whose role is to focus the incident fluorescence on a direct X-ray 2D detector, which was in this case an AndorIKON-L CCD相机with back lighting.

好处

图1。The emission signal from three different elements (carbon, nitrogen and oxygen) are recorded at one detector position.

The Andor iKON-L CCD camera has a resolution of 2048 x 2048 pixels with a 13.5 micron pixel size. It has excellent spatial resolution which is necessary for the spectrometer to offer high-caliber energy resolution of spectral signatures as a whole. Moreover, it is designed for intuitive function as well as possessing an efficient air cooling system to bring the temperature as low as -70 °C, which favors a high ratio of signal to noise. Its large chip size means it can cover a wide energy curve.

The increased size of the Andor iKon-L camera also allows the VLS grating characteristics to be taken full advantage of by the detector, leading to detection of energy of a large range. Figure 1 shows the range to be about 300 eV, that is, including the emission spectra of three separate elements (carbon, nitrogen and oxygen in this particular experiment), without sacrificing energy resolution. This enables efficient experimentation, yielding more data on the electronic structure of the elements tested.

参考和进一步阅读

1. Z. Yin，H。B. Peters，U。Hahn，M。Agåker，A。Hage，R。Reininger，F。Siewert，J。Nordgren，J。Viefhaus和S. Techert，Rev。Sci。乐器。86，093109（2015）。
2. Z. Yin, H.-B. Peters, U. Hahn, J. Gonschior, D. Mierwaldt, I. Rajkovic, J. Viefhaus, C. Jooss, and S. Techert, J. Synchrotron Radiat. 24, 302 (2017).

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