Abstract
In this paper, we experimentally investigate femtosecond laser-induced nitrogen fluorescence emission at different air pressures (0.1 Pa–100 kPa). The variation of nitrogen molecule (N2) and molecular nitrogen ion (N2+) characteristic fluorescence spectral lines' intensity as a function of air pressure is observed. When the air pressure is between 10 Pa and 100 kPa, the intensity of fluorescence signals from N2+ and N2 shows opposite variation as a function of air pressure. We deduce that dissociative recombination is the main pathway for the production of the C3∏u state of N2. This research helps elucidate the physical emission mechanism of femtosecond laser-induced nitrogen fluorescence emission.
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