Jérémy R Rouxel, Riccardo Mincigrucci, Danny Fainozzi and Claudio Masciovecchio
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引用次数: 0
Abstract
Measuring natural circular dichroism in the x-ray regime to extract stereochemical information from chiral molecules in solution remains a challenge. This is primarily due to technical limitations of the existing synchrotron sources, which hinder access to measurements of local chirality by exploiting core hole electronic transitions. In response to this challenge, we propose an alternative approach: utilizing XFEL-based cross-polarization x-ray transient grating (XTG). This method provides an indirect means to measure x-ray circular dichroism (XCD). Notably, our findings reveal that the signal emerges only once the excited cores have undergone dephasing through relaxation. XTG is now routinely measured in the XUV regime and has recently been made available for hard x-rays. Free electron lasers now offer polarization controls, and XTG can be extended to various polarization states for the two pump beams, making XCD measured by XTG feasible with the current state-of-the-art technology.
在 X 射线系统中测量自然圆二色性以提取溶液中手性分子的立体化学信息仍然是一项挑战。这主要是由于现有同步辐射源的技术限制,阻碍了通过利用核心空穴电子跃迁测量局部手性。为了应对这一挑战,我们提出了另一种方法:利用基于 XFEL 的交叉偏振 X 射线瞬态光栅 (XTG)。这种方法提供了一种间接测量 X 射线圆二色性(XCD)的方法。值得注意的是,我们的研究结果表明,只有在受激核心经过弛豫去相之后,信号才会出现。XTG 现已在 XUV 系统中进行常规测量,最近还可用于硬 X 射线。自由电子激光器现在提供偏振控制,XTG 可以扩展到两个泵浦光束的各种偏振态,这使得用 XTG 测量 XCD 在当前最先进的技术条件下变得可行。
期刊介绍:
Published twice-monthly (24 issues per year), Journal of Physics B: Atomic, Molecular and Optical Physics covers the study of atoms, ions, molecules and clusters, and their structure and interactions with particles, photons or fields. The journal also publishes articles dealing with those aspects of spectroscopy, quantum optics and non-linear optics, laser physics, astrophysics, plasma physics, chemical physics, optical cooling and trapping and other investigations where the objects of study are the elementary atomic, ionic or molecular properties of processes.