Volatile matter content is one of the important characteristics of coal, which would inevitably influence the laser-coal interaction process. In this work, the coal samples with different volatile matter contents were carried out by laser induced breakdown spectroscopy (LIBS) in argon atmosphere. The temporal and spatial evolution of spectra was captured along with the plasma evolution to investigate the mechanism of the volatile matter effects. The results showed that the spectral emissions for the species that abundant in volatile matter were intense at the plasma front, which indicated that the volatile matter vaporized preferentially as laser irradiating and pushed toward the upper part of the plasma. The distribution characteristics of the atomic carbon emission and ionic calcium emission of different coals demonstrated that the amount of vaporization increased with the volatile content. The more abundant dissociated volatile matter in the plasma plume benefited the generation of molecular carbon (CN and C₂) formed by several pathways, resulting in an enhancement on the corresponding emissions. Moreover, effects of volatile content on ablation process contributed to the difference in plasma structure and composition, which would be magnified during the plasma expansion and fluctuation process, contributing to greatly diverse plasma morphology and parameter distribution. Consequently, a conceptual laser-coal interaction model was proposed based on the comprehensive analysis of the measurements to describe the initiation and propagation of the effects of volatile matter on coal plasma.

挥发性物质含量是煤的重要特征之一，不可避免地会影响激光与煤的相互作用过程。在这项工作中，通过在氩气气氛中通过激光诱导击穿光谱法（LIBS）对具有不同挥发物含量的煤样品进行了处理。捕获了光谱的时空演化以及等离子体演化，以研究挥发物效应的机理。结果表明，挥发性物质丰富的物种的光谱发射在等离子体前沿很强，这表明挥发性物质在激光照射下优先蒸发并被推向等离子体的上部。不同煤的原子碳排放和离子钙排放的分布特征表明，蒸发量随挥发物含量的增加而增加。等离子羽流中更丰富的离解挥发性物质有利于分子碳（CN和C）的生成。₂）由几种途径形成，导致相应的排放量增加。此外，挥发物含量对烧蚀过程的影响导致了等离子体结构和组成的差异，在等离子体膨胀和波动过程中这种差异会被放大，从而导致等离子体形态和参数分布的差异很大。因此，在对测量结果进行综合分析的基础上，提出了概念性的激光-煤相互作用模型，以描述挥发性物质对煤等离子体影响的产生和传播。