Generation and structure of extremely large clusters in pulsed jets.
Generation and structure of extremely large clusters in pulsed jets.
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DOI：
10.1063/1.4890323
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发表时间：
2014-07
期刊：
影响因子：
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通讯作者：
D. Rupp;M. Adolph;L. Flückiger;T. Gorkhover;J. P. Müller;M. Müller;M. Sauppe;D. Wolter;S. Schorb;R. Treusch;C. Bostedt;T. Möller
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文献类型：
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作者：
D. Rupp;M. Adolph;L. Flückiger;T. Gorkhover;J. P. Müller;M. Müller;M. Sauppe;D. Wolter;S. Schorb;R. Treusch;C. Bostedt;T. Möller
在脉冲气体射流中产生了超大的氙气团，其大小超过哈格纳标度定律的预测数个数量级。利用汉堡自由电子激光器（FLASH）短波光脉冲的单次单粒子成像实验确定了簇的大小。扫描脉冲星团源与强飞秒x射线脉冲之间的时间延迟，首先显示出一个尺寸分布符合标度规律的主平台，其次是一个巨大星团的后脉冲。对于半径为几百纳米的超大团簇，x射线散射模式显示颗粒的粒状亚结构，表明它们通过团簇凝聚生长。
Extremely large xenon clusters with sizes exceeding the predictions of the Hagena scaling law by several orders of magnitude are shown to be produced in pulsed gas jets. The cluster sizes are determined using single-shot single-particle imaging experiments with short-wavelength light pulses from the free-electron laser in Hamburg (FLASH). Scanning the time delay between the pulsed cluster source and the intense femtosecond x-ray pulses first shows a main plateau with size distributions in line with the scaling laws, which is followed by an after-pulse of giant clusters. For the extremely large clusters with radii of several hundred nanometers the x-ray scattering patterns indicate a grainy substructure of the particles, suggesting that they grow by cluster coagulation.