Examples of fitted absorption spectra together with the corresponding fitting residual for a discharge of 10% CO2 + He with a frequency of 2 kHz, voltage of 3 kV and a pulse length of 150 ns. (a) Before discharge pulse t = 0 µs and t = 300 µs; (b) t = 3 µs when Tv3 reaches the maximum. The column marked as Bg. denotes the fitted absorption from the background CO2 that are defined as the CO2 in the gap between the discharge and the optical windows.
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