OODR-LIF on N2(A3Σ+u) in dielectric barrier discharges

We report on the application of Optical-Optical Double Resonance (OODR)LIF to the detection of N-2(A(3)Sigma(+)(u)) in a dielectric barrier discharge (DBD) along two research lines. At low pressure (1 divided by 30 Torr) OODR-LIF is used to selectively excite N-2 (C-3 Pi(u), v = 1) and obtain, with a direct method, electronic quenching and, for the first time, the collisional vibrational relaxation rate coefficient (C, v = 1) -> (C, v = 0). At high pressure OODR-LIF is used to measure again for the first time, N-2(A(3)Sigma(+)(u)) density with time and space resolution in an atmospheric pressure DBD, with the aid of a spectroscopic calibration method that relies upon the measurement of SPS and NO-gamma emissions in the post-discharge.