Time evolution of the measured absorbance in the afterglow of the nanosecond discharge. The first row and the first column of the matrix represents the sampling time points and the wavenumber, respectively. The columns from the second one denote the measured absorption versus wavenumber at the corresponding time point. The discharge is operated with 10% CO2 + He at 145 mbar with a frequency of 2 kHz, a voltage of 3 kV (I ∼ 6 A), and a pulse length of 150 ns.
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