Abstract
Velocity-modulation Fourier transform emission spectra from a N_2O/He discharge plasma recorded between 1 and 5.5 m are described. Surprisingly, they show Doppler-shifted lines for the E ^2 Σ^+ - D ^2 Σ^+, C ^2 Π- A ^2 Σ^+, and D ^2 Σ^+ - A ^2 Σ^+ Rydberg-Rydberg rovibronic transitions of the nitric oxide neutral molecule. These polarity-dependent Doppler-shifts are those of positively charged particles. Vibration-rotation lines of NO and transitions from other neutral molecules like N_2 are also present in the spectra with comparable intensities and remain unshifted. Experimental investigations and possible explanations are discussed.
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