Generation of X rays and energetic ions from superintense laser irradiation of micron-sized Ar clusters
Generation of X rays and energetic ions from superintense laser irradiation of micron-sized Ar clusters
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DOI：
10.1017/s0263034604223047
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发表时间：
2004-09-01
影响因子：
0.9
通讯作者：
Gasilov, VA
中科院分区：
文献类型：
--
作者：
Fukuda, Y;Akahane, Y;Gasilov, VA
在强度大于10（19）W/cm（2），脉宽为30 fs的条件下，测量了微米级At团簇的超强激光辐照等离子体的高分辨K壳层谱。对于Ar的He-α_1共振线（λ = 3.9491埃，3.14 keV），获得了2 × 10 ~（8）光子/脉冲的总光子通量。与X射线测量平行，已测量发射离子的能量分布。观察到了多电荷离子，其动能高达800 keV。研究发现，高对比度激光脉冲产生的超热电子使团簇等容加热，并使离子平衡向高电荷态移动，从而提高了类氦氩离子的X射线产额和离子动能.
High-resolution K-shell spectra of a plasma created by superintense laser irradiation of micron-sized At clusters have been measured with an intensity above 10(19) W/cm(2) and a pulse duration of 30 fs. The total photon flux of 2 X 10(8) photons/pulse was achieved for He-alpha1 resonant line of Ar (lambda = 3.9491 Angstrom, 3.14 keV). In parallel with X-ray measurements, energy distributions of emitted ions have been measured. The multiply charged ions with kinetic energies up to 800 keV were observed. It is found that hot electrons produced by high contrast laser pulses allow the isochoric heating of clusters and shift the ion balance toward the higher charge states, which enhances both the X-ray line yield of the He-like argon ion and the ion kinetic energy.