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Molecular N 2 fluorescence excited by laser filaments formed from laser pulses at 400 and 800 nm propagating in air is investigated. A comparison showed that, when excited with 400 nm photons, the fluorescence from the first negative band of N 2 + was enhanced by a factor of 6.4 while that of the second positive band of neutral N 2 remained relatively constant. The enhanced N 2 + signal is attributed to a more efficient inner-shell multiphoton process (to the B 2 + u state) at 400 nm leaving adoi:10.1103/physreva.82.023405 fatcat:bnyziqjgejhdhkocgm6eduzqrq