Abstract Continuing previous works on the dynamics of carbon plasmas generated by excimer laser ablation in vacuum, we report here a new study using Ar as background gas. The increased collision rate allows extended (both spatially and temporally) investigations of the low-emitting axial region of the unusual V-shape transient plasma evidenced in our previous works. The systematic study performed here by fast-gate intensified CCD photography and space- and time-resolved optical emission spectroscopy led to an extensive database, especially on the evolution of C, Ar and C-dimer (monitored through the Swan bands). The enhancement of the dimer formation (which has an important role in carbon plasma chemistry) in the lateral structures is confirmed and even amplified by the use of background gas. Furthermore, temperature and electron density values have been estimated from the spectroscopic data, providing additional proofs for the validity of the plasma dynamics scenario built for this unusual plume shape.

中文翻译：

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由准分子激光在氩气中烧蚀石墨产生的 V 形等离子体：光谱研究

摘要 继续先前关于真空中准分子激光烧蚀产生的碳等离子体动力学的工作，我们在此报告了一项使用 Ar 作为背景气体的新研究。增加的碰撞率允许对我们以前工作中证明的不寻常 V 形瞬态等离子体的低发射轴向区域进行扩展（空间和时间）研究。这里通过快速门增强 CCD 摄影和空间和时间分辨光学发射光谱进行的系统研究产生了一个广泛的数据库，特别是关于 C、Ar 和 C-二聚体的演变（通过 Swan 波段监测）。横向结构中二聚体形成的增强（在碳等离子体化学中具有重要作用）通过使用背景气体得到证实甚至放大。此外，