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CARS Measurements of Vibrational Distribution Function in Nanosecond Pulsed

By Walter R Lempert and Igor V. Adamovich


Picosecond Coherent Anti-Stokes Raman Scattering (CARS) has been used for studies of vibrational energy dynamics in a diffuse single filament pin-to-pin discharge in pure N2 and air. The discharge produces a filament with approximate dimensions 2-3 mm (diameter) x 10 mm (height) using a pair of 7.5 mm bare copper spherical electrodes. Results for N2 at P = 100 Torr are summarized in Fig. 1, which shows experimental and Master equation modeling predictions for total vibrational quanta/molecule in levels v = 0 – 8 for which population was observed, as well as discharge total specific energy loading, and modelling predictions for energy stored in vibration. It can be seen that experimentally approximately 30% of coupled pulse energy is loaded into the N2 vibrational mode which is in qualitative agreement with the modelling prediction of approximately 45%. However it can also be seen that the total vibrational quanta/molecule rises rapidly after the termination of the discharge pulse, by a factor of between ~two and three for time delays after discharge initiation in the range ~10–20

Year: 2013
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