Abstract
It is shown that the emission lines of N II nitrogen ions cannot contribute to the emission of other lines and be observed in the emission spectrum of plasma filaments, which are generated by femtosecond laser pulses with a peak intensity of ~50 TW/cm2 in air. A simple procedure is described that allows evaluation of the ratio of the line intensities for the filamentation in air.
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Original Russian Text © A.A. Ilyin, 2016, published in Pis’ma v Zhurnal Tekhnicheskoi Fiziki, 2016, Vol. 42, No. 20, pp. 6–10.
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Ilyin, A.A. The impossibility of recording emission lines of nitrogen ions in filament plasma. Tech. Phys. Lett. 42, 1024–1026 (2016). https://doi.org/10.1134/S1063785016100217
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DOI: https://doi.org/10.1134/S1063785016100217