Stark Broadening of Singly Ionized Nitrogen Lines

Jalufka, N. W.; Craig, J. P.

doi:10.1103/physreva.1.221

Cited by 21 publications

(3 citation statements)

References 16 publications

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“…During the spark phase, the electron number density N e is determined by modeling the experimental spectra of N + extracted at each radial position from Abel-inverted images. Among the line broadening sources (natural, pressure, Stark, Doppler, instrumental K), Stark broadening due to electron collisions [23,24] appears in our case to be predominant. With our set-up, the contribution of Doppler and pressure to N + lines broadening is negligible compared with the instrumental function (0.1 nm width).…”

Section: Electron Density and Temperature Measurements During The Spa...mentioning

confidence: 54%

Streamer-to-spark transition initiated by a nanosecond overvoltage pulsed discharge in air

Lo¹,

Cessou²,

Lacour³

et al. 2017

Plasma Sources Sci. Technol.

125

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This study is focused on the streamer-to-spark transition generated by an overvoltage nanosecond pulsed discharge under atmospheric pressure air in order to provide a quantitative insight into plasma-assisted ignition. The discharge is generated in atmospheric pressure air by the application of a positive high voltage pulse of 35 kV to pin-to-pin electrodes and a rise time of 5 ns. The generated discharge consists of a streamer phase with high voltage and high current followed by a spark phase characterized by a low voltage and a decreasing current in several hundreds of nanosecond. During the streamer phase, the gas temperature measured by optical emission spectroscopy related to the second positive system of nitrogen shows an ultra-fast gas heating up to 1200 K at 15 ns after the current rise. This ultra-fast gas heating, due to the quenching of electronically excited species by oxygen molecules, is followed by a quick dissociation of molecules and then the discharge transition to a spark. At this transition, the discharge contracts toward the channel axis and evolves into a highly conducting thin column. The spark phase is characterized by a high degree of ionization of nitrogen and oxygen atoms shown by the electron number density and temperature measured from optical emission spectroscopy measurements of N + lines. Schlieren imaging and optical emission spectroscopy techniques provide the time evolution of the spark radius, from which the initial pressure in the spark is estimated. The expansion of the plasma is adiabatic in the early phase. The electronic temperature and density during this phase allows the determination of the isentropic coefficient. The value around 1.2-1.3 is coherent with the high ionization rate of the plasma in the early phase. The results obtained in this study provide a database and the initial conditions for the validation of numerical simulations of the ignition by plasma discharge.

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Section: Electron Density and Temperature Measurements During The Spa...mentioning

confidence: 54%

Streamer-to-spark transition initiated by a nanosecond overvoltage pulsed discharge in air

Lo¹,

Cessou²,

Lacour³

et al. 2017

Plasma Sources Sci. Technol.

125

View full text Add to dashboard Cite

show abstract

“…[14] 2s 2 2p( 2 P o )3p-2s 2 2p( 2 P o )3d [9] 39, 3 (12) [15] 32 (12) [16] When comparing Stark widths from this work with previous experimental data, we should restrict ourselves to experiments with similar plasma parameters to those used here, for instance, those from [5,6,8,10,11,16] and the agreement is in general good, especially perhaps with that of Djeniže et al [16]. Concerning data taken under very different plasma conditions, this good agreement extends to all experiments developed at similar temperatures to ours [7,15] and systematically lower values are found in experiments with much higher T e values [12,17], which may be explained according to the predicted and observed (see figure 5) decreasing trend of the Stark width with increasing temperature.…”

Section: Table 1 Summary Of the Plasma Conditions Concerning The Expe...mentioning

confidence: 99%

“…According to reviews [1][2][3], there are a number of important experimental works [4][5][6][7][8][9][10][11][12] and some theoretical ones [13,14] in the literature dealing with the Stark parameters of N II lines. Although several new results have been published subsequently [15][16][17], there still remain some discrepancies to be clarified and the number of lines for which there are available data is small in comparison with the complete visible N II spectrum, especially for 2s 2 2p( 2 P o )3p-2s 2 2p( 2 P o )3d, 2s 2 2p( 2 P o )3d-2s 2 2p( 2 P o 1/2 )4f and 2s2p 2 ( 4 P)3s-2s2p 2 ( 4 P)3p transition arrays.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Stark broadening and shift of visible N II lines

Mar¹,

Aparicio²,

Ma³

et al. 2000

J. Phys. B: At. Mol. Opt. Phys.

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This work reports information about Stark broadening and shift parameters of a very extensive collection of visible singly ionized nitrogen lines. All of them were measured in a linear discharge lamp from a mixture of nitrogen and helium. Electron density and temperature range in this experiment from 0.2 to 1.1 × 10 23 m −3 and from 17 000 to 29 000 K, respectively. The first one has been simultaneously determined from two-wavelength interferometry and from the Stark broadening of He I 471.3 nm, the second from a Boltzmann plot of N II lines and from N II/N I intensity ratios. Dependences of these Stark parameters with temperature and electron density have been investigated and the final results have been compared with most of the previous experimental data as well as with two theoretical models. All relevant details relative to this experiment are given in the paper.

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Fundamental Spectroscopic Data

Jager¹

1973

Transactions of the International Astronomical Union Volume XVA

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Stark Broadening of Singly Ionized Nitrogen Lines

Cited by 21 publications

References 16 publications

Streamer-to-spark transition initiated by a nanosecond overvoltage pulsed discharge in air

Streamer-to-spark transition initiated by a nanosecond overvoltage pulsed discharge in air

Measurement of Stark broadening and shift of visible N II lines

Fundamental Spectroscopic Data

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