Assignment of the 15NH3 v2 ( 2a->2s) rotational MIR laser transitions pumped by a tunable CO2 laser

The assignment of the 15NH3 MIR rotational laser previuosly observed (T.tillert et al. IR&MMW 17 1011-21 (1996)) inside the 2v2 vibrational level is reported . The most part of the reported emissions is due to the off-resonance two-photon pumping (0a->1s->2a) with intermediate detunings al large as 800GHz