论文标题
激发原子和分子态在XUV诱导的氨簇中的纳米质体的时间分辨形成
Time-resolved formation of excited atomic and molecular states in XUV-induced nanoplasmas in ammonia clusters
论文作者
论文摘要
来自自由电子（FEL）的高强度XUV辐射用于在氨组内创建纳米质量，目的是研究所得的电子离子相互作用及其与血浆演化的相互作用。在类似等离子体的状态下，具有动能的电子低于阳性离子核的局部集体库仑电位，被困在群集中，并参与二次过程（例如电子损伤激发/电离和电子重新组合），从而导致随后的激发和中性的分子片段。使用时间延迟的紫外线激光器，将激发原子和分子状态的动力学从-0.1 ps到18 ps进行探测。我们确定了三个不同的分子碎片阶段，这些阶段通过探针激光器对离子和电子产量的影响明确区分。我们提出了一个简单的模型来合理化数据并进一步识别两个单独的通道，从而导致激发氢的形成。
High intensity XUV radiation from a free-electron (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.
