Blackbody Emission from Laser Breakdown in High-Pressure Gases
Blackbody Emission from Laser Breakdown in High-Pressure Gases
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DOI：
10.1103/physrevlett.113.075001
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发表时间：
2014-08-15
影响因子：
8.6
通讯作者：
Putterman, S.
中科院分区：
文献类型：
--
作者：
Bataller, A.;Plateau, G. R.;Putterman, S.
激光诱导加压气体的击穿用于在原子密度和温度与声致发光气泡中发现的相似的条件下产生等离子体。校准的条纹光谱表明，在令人兴奋的飞秒激光脉冲关闭后，黑体仍然存在。在出人意料的低原子密度下观察到与萨哈状态方程的偏差以及伴随的电离势的大幅降低——与声致发光平行。在激光击穿中，能量输入通过电子激发进行，而在声致发光中，能量输入是通过原子引发的。类似的响应表明这些系统正在揭示强耦合等离子体的热力学和传输。
Laser induced breakdown of pressurized gases is used to generate plasmas under conditions where the atomic density and temperature are similar to those found in sonoluminescing bubbles. Calibrated streak spectroscopy reveals that a blackbody persists well after the exciting femtosecond laser pulse has turned off. Deviation from Saha's equation of state and an accompanying large reduction in ionization potential are observed at unexpectedly low atomic densities-in parallel with sonoluminescence. In laser breakdown, energy input proceeds via excitation of electrons whereas in sonoluminescence it is initiated via the atoms. The similar responses indicate that these systems are revealing the thermodynamics and transport of a strongly coupled plasma.