Identification of twinned gas phase clusters by single-shot scattering with intense soft x-ray pulses
Identification of twinned gas phase clusters by single-shot scattering with intense soft x-ray pulses
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DOI：
10.1088/1367-2630/14/5/055016
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发表时间：
2012-05-16
影响因子：
3.3
通讯作者：
Bostedt, C.
中科院分区：
文献类型：
--
作者：
Rupp, D.;Adolph, M.;Bostedt, C.
利用汉堡自由电子激光(闪光)产生的高强度软x射线激光脉冲对氙纳米团簇进行了散射实验，研究了气相中不同的团簇形态。可以识别三种不同类型的散射图案。最常见的同心环图案反映了聚焦的单个球状星团的事件。当两个星系团以微米距离照射时，会出现类似于牛顿环的精细干涉环，揭示出关于星系团位置的三维信息。在所有命中中，有10%到30%显示出以前未知的孪生星团配置，其中两个星团直接接触。对两个粒子大小、熔合度和空间取向不同的孪生星系团的散射模式的模拟可以解释所有观察到的模式。
Scattering experiments on xenon nanoclusters with high-intensity soft x-ray laser pulses from the Free-Electron LASer in Hamburg (FLASH) are performed to investigate different cluster morphologies in the gas phase. Three different types of scattering patterns can be identified. The most frequent pattern of concentric rings reflects the event of a single spherical cluster in focus. Fine interference rings similar to Newton rings appear when two clusters are illuminated at mu m distance, revealing three-dimensional information about the location of the clusters. Between 10 and 30% of all hits show a previously unknown twin cluster configuration with two clusters in direct contact. Simulations of scattering patterns for twin clusters with different sizes of the two particles, degree of fusion and orientation in space allow us to explain all the observed patterns.