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首页> 外文期刊>Physical chemistry chemical physics: PCCP >Time-resolved formation of excited atomic and molecular states in XUV-induced nanoplasmas in ammonia clusters
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Time-resolved formation of excited atomic and molecular states in XUV-induced nanoplasmas in ammonia clusters

机译:在氨簇中XUV诱导纳米纳米纳米纳米纳克马斯中激发原子和分子状态的时间分辨形成

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摘要

High intensity XUV radiation from a free-electron laser (FEL) was used to create a nanoplasma inside ammonia clusters with the intent of studying the resulting electron-ion interactions and their interplay with plasma evolution. In a plasma-like state, electrons with kinetic energy lower than the local collective Coulomb potential of the positive ionic core are trapped in the cluster and take part in secondary processes (e.g. electron-impact excitation/ionization and electron-ion recombination) which lead to subsequent excited and neutral molecular fragmentation. Using a time-delayed UV laser, the dynamics of the excited atomic and molecular states are probed from -0.1 ps to 18 ps. We identify three different phases of molecular fragmentation that are clearly distinguished by the effect of the probe laser on the ionic and electronic yield. We propose a simple model to rationalize our data and further identify two separate channels leading to the formation of excited hydrogen.
机译:采用来自自由电子激光器(FEL)的高强度XUV辐射在氨簇内产生纳米型簇,意图研究所得到的电子离子相互作用及其与等离子体进化的相互作用。 在等离子体状态下,具有低于正离子芯的局部集体库仑电位的电子的电子被捕获在簇中,并参与次要的次要过程(例如电子碰撞激发/电离和电子离子复合) 随后兴奋和中性分子破碎。 使用时间延迟的UV激光,探测激发原子和分子状态的动态从-0.1pe至18 ps。 我们鉴定了三种不同阶段的分子碎片,通过探针激光对离子和电子收率的影响明确区分。 我们提出了一种简单的模型来合理化我们的数据,并进一步确定两个单独的通道,导致兴奋氢的形成。

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