This Letter reports dual-frequency-comb spectroscopy in the deep ultraviolet used to characterize transient laser-produced plasmas. Dual-comb spectroscopy at these wavelengths enables access to a large number of strong electronic transitions in neutral and ionized atoms and molecules. This broadband dual-frequency-comb system at 265 nm measures multiple transitions in neutral and singly ionized iron atoms in a laser-produced plasma. Analysis of absorption spectra yields time-resolved ion and neutral column densities, excitation temperatures, and electron densities, which are measured down to {10^{14}}\; {{\rm cm}^{- 3}}${10^{14}}\; {{\rm cm}^{- 3}}$ levels. The results provide insights into low-temperature plasma properties.

中文翻译：

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深紫外双梳光谱

这封信报道了深紫外双频梳光谱学，用于表征瞬态激光产生的等离子体。这些波长的双梳光谱能够获得中性和电离原子和分子中的大量强电子跃迁。这种 265 nm 的宽带双频梳系统可测量激光产生的等离子体中中性和单电离铁原子的多次跃迁。吸收光谱分析产生时间分辨离子和中性柱密度、激发温度和电子密度，测量值低至{10^{14}}\； {{\rm cm}^{- 3}}${10^{14}}\; {{\rm cm}^{- 3}}$级。结果提供了对低温等离子体特性的深入了解。