资源环境科技发展态势分析平台

Sub‐microsecond (0.476 μs per frame with an exposure time of 160 ns) high resolution (0.38 nm) time resolved spectra of laboratory produced lightning‐like electrical discharges have been recorded for the first time within the visible spectral range (645 nm ‐ 665 nm). The spectra were recorded with the GrAnada LIghtning Ultrafast Spectrograph (GALIUS), a high speed imaging spectrograph recently developed for lightning research in the IAA‐CSIC. Unprecedented spectral time‐dynamics are explored for meter long laboratory electrical discharges produced with a 2.0 MV Marx generator. The maximum electron density and gas temperature measured in a time scale of ≤ 0.50 μs (160 ns) were, respectively, ≃ 10¹⁸ cm^‐3 and ≃ 32000 K. Over pressure in the lightning‐like plasma channel, black body dynamics and self‐absorption in spectral lines were investigated.