Title :
Measurements of N2(A) by pulsed cavity ringdown spectroscopy in repetitively pulsed nanosecond discharges
Author :
Janda, M. ; Stancu, G.D. ; Spence, T.G. ; Harb, C. ; Kaddouri, F. ; Pai, D. ; Lacoste, D.A. ; Laux, C.O.
Author_Institution :
Dept. of Astron., Comenius Univ., Bratislava, Slovakia
Abstract :
We present here results from the measurements of metastable N2(A) species in nanosecond repetitively pulsed (NRPP) discharge in N2 and air, obtained by using pulsed cavity ring-down spectroscopy (CRDS) at 770 nm. Despite the small plasma volume (1-10 mm3) and short lifetime of studied plasma species, CRDS enabled us to obtain spectra with spectral resolution down to 1 pm. The temporal variations of N2(A) concentration in a nitrogen plasma were measured and absolute concentrations of N2(A) in nitrogen and air plasmas were determined. These results were then used to validate a kinetic model, which already showed good agreement with the spatial and temporal evolution of other excited state species such as N2(B), N2(C), N2 +(B), NO(A) and O(3p 5P) measured using intensity calibrated emission spectroscopy.
Keywords :
discharges (electric); nitrogen; plasma density; plasma diagnostics; N2; air plasmas; excited state species; intensity calibrated emission spectroscopy; kinetic model; metastable species; nanosecond repetitively pulsed discharges; nitrogen plasma; plasma species lifetime; plasma volume; pulsed cavity ringdown spectroscopy; spectral resolution; wavelength 770 nm; Atmospheric-pressure plasmas; Extraterrestrial measurements; Force measurement; Nitrogen; Optical losses; Plasma measurements; Pulse measurements; Ring lasers; Spectroscopy; Voltage;
Conference_Titel :
Gas Discharges and Their Applications, 2008. GD 2008. 17th International Conference on
Conference_Location :
Cardiff
Print_ISBN :
978-0-9558052-0-2
