X-Ray Diffraction from Isolated and Strongly Aligned Gas-Phase Molecules with a Free-Electron Laser
X-Ray Diffraction from Isolated and Strongly Aligned Gas-Phase Molecules with a Free-Electron Laser
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DOI：
10.1103/physrevlett.112.083002
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发表时间：
2014-02-28
影响因子：
8.6
通讯作者：
Chapman, Henry N.
中科院分区：
文献类型：
--
作者：
Kuepper, Jochen;Stern, Stephan;Chapman, Henry N.
报道了用直线加速器相干光源对典型的不对称转子分子2，5-二碘苯腈的量子态选择和强排列系综进行X射线衍射的实验结果。这些实验展示了迈向一种新的方法的第一步，该方法可以对单个孤立的气相分子的不同结构进行衍射成像。我们确认了单分子衍射实验的几个关键要素：在单次激发衍射数据中检测和计算单个散射x射线光子的能力，将状态选择的(例如结构选择的)分子系综传递到x射线相互作用体积的能力，以及强烈排列散射分子的能力。我们的方法，使用超短X射线脉冲，适用于研究孤立分子的超快动力学。
We report experimental results on x-ray diffraction of quantum-state-selected and strongly aligned ensembles of the prototypical asymmetric rotor molecule 2,5-diiodobenzonitrile using the Linac Coherent Light Source. The experiments demonstrate first steps toward a new approach to diffractive imaging of distinct structures of individual, isolated gas-phase molecules. We confirm several key ingredients of single molecule diffraction experiments: the abilities to detect and count individual scattered x-ray photons in single shot diffraction data, to deliver state-selected, e.g., structural-isomer-selected, ensembles of molecules to the x-ray interaction volume, and to strongly align the scattering molecules. Our approach, using ultrashort x-ray pulses, is suitable to study ultrafast dynamics of isolated molecules.