Cluster explosion investigated by linearly chirped spectral scattering of an expanding plasma sphere
Cluster explosion investigated by linearly chirped spectral scattering of an expanding plasma sphere
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DOI：
10.1103/physreva.73.033201
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发表时间：
2006-03
影响因子：
2.9
通讯作者：
Jiansheng Liu;Cheng Wang;Bingchen Liu;B. Shuai;Wentao Wang;Yi Cai;Hongyu Li;G. Ni;Ruxin Li-Ruxi
中科院分区：
文献类型：
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作者：
Jiansheng Liu;Cheng Wang;Bingchen Liu;B. Shuai;Wentao Wang;Yi Cai;Hongyu Li;G. Ni;Ruxin Li-Ruxi
用90度边谱散射法研究了线性啁啾超强激光脉冲辐照下Ar团簇的飞秒爆炸过程。测量了负啁啾和正啁啾驱动激光脉冲的光谱红移和蓝移，它们与团簇爆炸过程相关。加热团簇极化率的演化表明，团簇的核心在爆炸开始时被激光场屏蔽，在快速爆炸开始后发生了增强的散射。从利用透射谱测量的增强散射和增强吸收的符合中发现了共振加热的证据。用这种方法观测到了气体密度很低的异常大尺寸星系团，可以作为清洁和重要的星系团目标。
Femtosecond explosive processes of argon clusters irradiated by linearly chirped ultraintense laser pulses have been investigated by 90 degrees side spectral scattering. The spectral redshift and blueshift, which correlate with the cluster explosion processes have been measured for negatively and positively chirped driving laser pulses, respectively. The evolution of the heated-cluster polarizability indicates that the core of the cluster is shielded from the laser field in the beginning of the explosion and enhanced scattering occurs after the fast explosion initiates. Evidence of resonant heating is found from the coincidence of enhanced scattering with enhanced absorption measured using the transmitted spectra. Anomalously large-size clusters with very low gas density have been observed in this way and can be used as clean and important cluster targets.