Eseev Marat, Goshev Andrey, Makarov Dmitry
Northern (Arctic) Federal University named after M.V. Lomonosov, Severnaya Dvina Emb. 17, 163002 Arkhangelsk, Russia.
Nanomaterials (Basel). 2020 Jul 10;10(7):1355. doi: 10.3390/nano10071355.
Currently, the study of the scattering of ultrashort X-ray pulses (USPs) by various objects is an urgent task, in connection with the creation of powerful sources of USP generation. In this paper, the theory of the scattering of attosecond pulses by polyatomic structures is developed taking into account the magnetic component of USPs. It is shown that the scattering spectra depend not only on the structure of the target, but also on other characteristics of USPs. Results are presented of the calculation of the scattering spectra on various nanosystems, such as rings, groups of rings, carbon nanotubes (CNTs), and groups of co-directed CNTs (forest CNTs). The calculation results are presented in an analytical form, which allows a general analysis of the expressions. It was found that taking the magnetic component of the momentum into the scattering spectra into account leads to the generation of the second harmonic. In this case, the spectra have characteristic features and differ from the scattering spectra at the carrier frequency, which can complement ultra-high-resolution X-ray analysis. It is shown that the scattering spectra of some structures, for example, forest CNTs, have a strictly specified radiation direction and such material in the field of such USPs is non-reflective (completely black).
当前，鉴于超短X射线脉冲（USPs）强大产生源的创建，研究USPs被各种物体散射是一项紧迫任务。本文考虑到USPs的磁分量，发展了多原子结构对阿秒脉冲散射的理论。结果表明，散射光谱不仅取决于靶的结构，还取决于USPs的其他特性。给出了在各种纳米系统上散射光谱的计算结果，如环、环组、碳纳米管（CNTs）以及同向排列的碳纳米管组（森林状碳纳米管）。计算结果以解析形式呈现，这便于对表达式进行总体分析。研究发现，将动量的磁分量考虑到散射光谱中会导致二次谐波的产生。在这种情况下，光谱具有特征特性，并且与载频处的散射光谱不同，这可以补充超高分辨率X射线分析。结果表明，某些结构（例如森林状碳纳米管）的散射光谱具有严格指定的辐射方向，并且在这种USPs场中的此类材料是不反射的（完全呈黑色）。
