laser -团簇相互作用中keV X射线产生的低强度阈值
Low intensity threshold values for keV X-ray production in laser-cluster interaction
摘要：
绝对Ar XK（3千电子伏）和Ar XXL（4千电子伏）的光子产额测量作为激光峰值强度的函数，大（104 - 105原子）氩和氙团簇提交到强激光脉冲。观察到明显的阈值行为。的强度阈值被发现低至2 1014 Wcm-2，一个值匹配的生产单电荷的氩或双电荷的氙通过光场电离。内壳层电离可能涉及的机制进行了讨论。keV X射线生产的优化结果强调。
英文摘要：
Absolute Ar XK (3 keV) and Xe XL (4 keV) photon yields are measured as a function of laser peak intensity, for large (104 - 105 atoms) argon and xenon clusters submitted to intense laser pulses. A clear threshold behavior is observed. The intensity threshold is found as low as 2 1014 Wcm-2, a value matching the production of singly-charged argon or doubly-charged xenon by optical field ionization. Possible mechanisms involved in the inner-shell ionization are discussed. The outcome on the optimization of keV X-ray production is underlined.
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