Using the method of spectrally selective photorecording in a nanosecond temporal resolution, the distribution of neutral atoms and single- and double-charged gallium ions in a plasma plume is investigated under the conditions of laser ablation of a gallium-indium target and so is the expansion dynamics of both components and the plume as a whole. The expansion velocity of a neutral atomic component of the plume is found. The expansion velocity of the glow boundary and the shift velocity of the glow intensity maximum are found to be close to 8.5∙103 and 6∙103 m/s, respectively. The kinetic energy range, corresponding to these values for the gallium atoms (13–26 eV) is quite consistent with the position of local maximum measured earlier from the energy distribution of single-charged gallium ions.

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激光烧蚀等离子体空间电荷结构与膨胀动力学的实验研究

使用纳秒时间分辨率的光谱选择性光记录方法，研究了在镓铟靶激光烧蚀条件下等离子体羽流中中性原子和单电荷和双电荷镓离子的分布以及扩展两个组件和整个羽流的动力学。发现了羽流的中性原子成分的膨胀速度。发现辉光边界的膨胀速度和辉光强度最大值的移动速度分别接近 8.5∙103 和 6∙103 m/s。对应于镓原子的这些值 (13-26 eV) 的动能范围与早先从单电荷镓离子的能量分布测量的局部最大值的位置非常一致。