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利用飞行时间谱，研究了在飞秒强激光场（60 fs，2×1016 W/cm2）作用下，大尺寸氩原子团簇Arn（n—=3×103—3×106原子/每团簇）的电离爆炸过程，测量了 团簇爆炸所产生的氩离子的平均能量与团簇尺寸（气体背压）的关系.实验发现，随着气体 背压的升高（团簇尺寸增大），氩离子的平均能量也相应升高.通过分析两个不同几何尺寸 锥形超声喷嘴所产生团簇爆炸后的离子能量，结合Hagena团簇尺寸规律，发现在激光参数保 持不变的情况下，离子的平均能量由团簇尺寸唯一确定.分析表明，团簇尺寸在3×105原 子/每团簇以下时，团簇膨胀的主要机理是库仑爆炸.随着团簇尺寸的进一步增大，团簇膨胀 机理将由库仑爆炸向流体动力学膨胀过渡，在3×105By using timeofflight spectroscopy, the ionization and explosion of large argon clusters (n—=3×103-3×106) in the intense femtosecond pulsed lase r field (60 fs，2×1016 W/cm2) has been studied, and the dependence of a verage energy of ions emitted from argon clusters on the gas backing pressure ha s been measured. By comparing the average ion energies obtained with two differe nt supersonic conical nozzles and considering the Hagena's scaling law of clust ers, we have found that the average ion energy is determined by the cluster size when the laser parameters are kept unchanged. The experimental results indicate d that when the cluster size is less than 3×105 atoms per cluster, the Coulom b repulsion force is the dominating factor in the expansion mechanism. Beyond th is size, for 3×105
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物理学报. 2005, 54(2): 636-641.
doi: 10.7498/aps.54.636.
飞秒强激光场中大尺寸氩团簇爆炸机理的实验研究
- 收稿日期: 2004-03-09
- 修回日期: 2004-05-27
- 刊出日期: 2005-01-05
摘要: 利用飞行时间谱，研究了在飞秒强激光场（60 fs，2×1016 W/cm2）作用下，大尺寸氩原子团簇Arn（n—=3×103—3×106原子/每团簇）的电离爆炸过程，测量了 团簇爆炸所产生的氩离子的平均能量与团簇尺寸（气体背压）的关系.实验发现，随着气体 背压的升高（团簇尺寸增大），氩离子的平均能量也相应升高.通过分析两个不同几何尺寸 锥形超声喷嘴所产生团簇爆炸后的离子能量，结合Hagena团簇尺寸规律，发现在激光参数保 持不变的情况下，离子的平均能量由团簇尺寸唯一确定.分析表明，团簇尺寸在3×105原 子/每团簇以下时，团簇膨胀的主要机理是库仑爆炸.随着团簇尺寸的进一步增大，团簇膨胀 机理将由库仑爆炸向流体动力学膨胀过渡，在3×105
English Abstract
Experimental study on explosion mechanism of large agron clusters in intense laser pulses
- Received Date:
09 March 2004
- Accepted Date:
27 May 2004
- Published Online:
05 January 2005
Abstract: By using timeofflight spectroscopy, the ionization and explosion of large argon clusters (n—=3×103-3×106) in the intense femtosecond pulsed lase r field (60 fs，2×1016 W/cm2) has been studied, and the dependence of a verage energy of ions emitted from argon clusters on the gas backing pressure ha s been measured. By comparing the average ion energies obtained with two differe nt supersonic conical nozzles and considering the Hagena's scaling law of clust ers, we have found that the average ion energy is determined by the cluster size when the laser parameters are kept unchanged. The experimental results indicate d that when the cluster size is less than 3×105 atoms per cluster, the Coulom b repulsion force is the dominating factor in the expansion mechanism. Beyond th is size, for 3×105
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