Modeling of particle density in plasma filament formed by femtosecond laser pulse in air

The temporal evolution of intensity of N2 337 nm and N2+ 391.2 nm lines is compared with modeling results for filament plasma produced by tightly focused femtosecond laser pulse (0.9 mJ, 48 fs). Model correctly predicts enhanced emission of 1+ system, higher intensity of O I 777.4 nm line and dynamics of excited states density.

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