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

Jans, E. R.; Frederickson, K.; Miller, T. A.; Adamovich, I. V.

doi:10.1016/j.jms.2019.111205

Time-resolved populations of N₂(A₃Σ_u⁺,v) in nanosecond pulse discharge plasmas

Journal Article · Tue Sep 24 00:00:00 EDT 2019 · Journal of Molecular Spectroscopy

DOI:https://doi.org/10.1016/j.jms.2019.111205· OSTI ID:1801075

Jans, E. R. ^[1]; Frederickson, K. ^[2]; Miller, T. A. ^[2]; Adamovich, I. V. ^[2]

The Ohio State Univ., Columbus, OH (United States); OSTI
The Ohio State Univ., Columbus, OH (United States)

Absolute time-resolved populations of N₂ in the excited A₃Σ_u⁺ 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(A³Σ_u⁺,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(A³Σ_u⁺,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(A₃Σ_u⁺,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(A₃Σ_u⁺) 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(A₃Σ_u⁺,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.

View Accepted Manuscript (DOE)

Research Organization:: University 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, Journal Name: Journal of Molecular Spectroscopy Journal Issue: C Vol. 365; ISSN 0022-2852

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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