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Two-photon-induced polarization spectroscopy of molecular nitrogen in the a 1 ⌸ g ͑Ј ϭ 1͒ 4 X 1 ⌺ g ϩ ͑Љ ϭ 0͒ system near 283 nm was performed, and its signal dependence investigated over the pressure range from 1.2 to 5 bars at 300 K. A significant increase of the signal intensity with pressure beyond the expected square law for a two-photon process was observed for pure nitrogen. Similar behavior was also found for a constant nitrogen partial pressure with increasing partial pressures ofdoi:10.1364/ao.39.001042 pmid:18337983 fatcat:ndt32drut5dj7e3fmqc5krvcbi