Femtosecond X-ray-induced explosion of C60 at extreme intensity
Femtosecond X-ray-induced explosion of C60 at extreme intensity
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DOI：
10.1038/ncomms5281
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发表时间：
2014-06-01
影响因子：
16.6
通讯作者：
Berrah, N.
中科院分区：
文献类型：
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作者：
Murphy, B. F.;Osipov, T.;Berrah, N.
了解强烈 X 射线照射下的分子飞秒动力学对于极端条件下生物分子成像和物质的进展至关重要。在原子空间尺度和原子运动时间尺度上对病毒和蛋白质进行成像需要对强 X 射线照射的动力学效应进行严格、定量的了解。在这里，我们提出了 C-60 分子与自由电子激光器发出的强 X 射线脉冲相互作用的实验和理论研究，揭示了之前未报道过的过程的影响。我们的工作展示了如何成功地使用经典力学来描述 C-60 中的所有运动粒子，这种方法可以很好地扩展到更大的系统，例如生物分子。该模型与 C-60 离子碎裂实验数据的比较显示在各种激光条件下都具有良好的一致性。结果表明，该模型适用于 X 射线与任何扩展系统的相互作用，即使未来光源预期的 X 射线剂量率更高。
Understanding molecular femtosecond dynamics under intense X-ray exposure is critical to progress in biomolecular imaging and matter under extreme conditions. Imaging viruses and proteins at an atomic spatial scale and on the time scale of atomic motion requires rigorous, quantitative understanding of dynamical effects of intense X-ray exposure. Here we present an experimental and theoretical study of C-60 molecules interacting with intense X-ray pulses from a free-electron laser, revealing the influence of processes not previously reported. Our work illustrates the successful use of classical mechanics to describe all moving particles in C-60, an approach that scales well to larger systems, for example, biomolecules. Comparisons of the model with experimental data on C-60 ion fragmentation show excellent agreement under a variety of laser conditions. The results indicate that this modelling is applicable for X-ray interactions with any extended system, even at higher X-ray dose rates expected with future light sources.