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Title: Time-resolved populations of N2(A3Σu+,v) in nanosecond pulse discharge plasmas

Journal Article · · Journal of Molecular Spectroscopy
 [1];  [1];  [1];  [1]
  1. The Ohio State Univ., Columbus, OH (United States)
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Absolute time-resolved populations of N2 in the excited A3Σu+ electronic state that are generated in a repetitive ns pulse discharge in nitrogen have been measured by Cavity Ring Down Spectroscopy (CRDS) and Tunable Diode Laser Spectroscopy (TDLAS). CRDS measurements of N2(A3Σu+,v = 0–2) populations are made in the discharge afterglow at pressures of 22 and 39 Torr. The data reduction procedure takes into account the linewidth of the pulsed laser source, which is comparable with the absorption linewidth and results in a non-single exponential ring down decay. Peak N2(A3Σu+,v = 0–2) populations after a 10-pulse ns discharge burst are in the range of 1012–1013 cm-3. In the afterglow, these populations exhibit a relatively slow decay with the characteristic time of approximately 500 μs, most likely due to the quenching by N atoms. TDLAS data have been taken at a higher pressure of 132 Torr. Absolute time-resolved N2(A3Σu+,v = 0,1) number densities are measured during ns pulse discharge bursts up to 5 pulses long and in the afterglow, peaking at 6·1012 cm-3 and 3·1013 cm-3, respectively. The results indicate that N2(A3Σu+) is generated after every discharge pulse on a 20–50 μs time scale, much longer compared to the discharge pulse duration of ~100 ns, and subsequently decays between the pulses. The decay rate increases during the discharge burst. In the afterglow, N2(A3Σu+,v = 0,1) population decay significantly more rapidly compared to the low-pressure CRDS conditions, with the characteristic time of approximately 160 μs after a 5-pulse discharge burst.

Research Organization:
Univ. of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0002374
OSTI ID:
1801075
Alternate ID(s):
OSTI ID: 1570093
Journal Information:
Journal of Molecular Spectroscopy, Vol. 365, Issue C; ISSN 0022-2852
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

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