Fig. 4: Promoted vibrational excitation of N2 with low gas temperatures.
From: Enhanced production of active species and NH3 using non-equilibrium ferroelectric barrier discharge
a Average throughout one complete applied voltage cycle (50 μs) and time-dependent vibrational Q-branch CARS spectra of N2 in FBD and Al2O3 DBD with and without H2 addition (Shaded band: uncertainty from laser-energy jitter). In FBD, N2 vibrational bands up to ν = 2 are observed while vibrational levels ν ≥1 are barely detectable in Al2O3 DBD. b Vibrational temperatures of N2(ν) in FBD. N2 vibrational temperature is lower in N2/H2 mixtures than in pure N2 since the addition of H2 enabled more energy transfer pathways. c Pure-rotational CARS spectra of N2 (averaged throughout one complete applied voltage cycle) in FBD and DBD with and without H2 addition. d Rotational temperatures of N2 in Al2O3 DBD and FBD calculated from pure-rotational N2 CARS spectra. The small variation in rotational temperatures indicates negligible influence of heating from vibrational-translational relaxation between N2(ν) and H2.
