1] Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008, USA [2].
1] Center for Free-Electron Laser Science, DESY, 22607 Hamburg, Germany [2] The Hamburg Centre for Ultrafast Imaging, 22761 Hamburg, Germany [3].
Nat Commun. 2014 Jun 27;5:4281. doi: 10.1038/ncomms5281.
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 C60 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 C60, an approach that scales well to larger systems, for example, biomolecules. Comparisons of the model with experimental data on C60 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.
理解强 X 射线辐射下的分子飞秒动力学对于生物分子成像和极端条件下物质的研究至关重要。在原子空间尺度和原子运动的时间尺度上对病毒和蛋白质进行成像，需要严格、定量地了解强 X 射线辐射的动力学效应。在这里，我们对 C60 分子与自由电子激光产生的强 X 射线脉冲相互作用进行了实验和理论研究，揭示了以前未报道过的过程的影响。我们的工作说明了成功地使用经典力学来描述 C60 中所有运动的粒子，这种方法可以很好地扩展到更大的系统，例如生物分子。对 C60 离子碎裂的模型与实验数据的比较表明，在各种激光条件下都有极好的一致性。结果表明，这种模型适用于任何扩展系统与 X 射线的相互作用，即使在未来光源预期的更高 X 射线剂量率下也是如此。
