A numerical model describing the dynamics of plasma particle density upon filamentation of femtosecond emission in air is presented. The simulation results are in good agreement with the available experimental data. The pumping processes of the N2 and N2+ radiative levels are investigated. The model predicts a tight drop in the electron temperature and density within 1 ns. For the first positive nitrogen system, an excess of the population of the upper emission level over the population of the lower level is observed for 550 ps.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 9, pp. 42–48, September, 2021.
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Ilyin, A.A., Shmirko, K.A., Golik, S.S. et al. Emission of Nitrogen Molecules at Tight Focusing of Femtosecond Laser Pulses in Air. Russ Phys J 64, 1629–1636 (2022). https://doi.org/10.1007/s11182-022-02499-3
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DOI: https://doi.org/10.1007/s11182-022-02499-3