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Absolute nitrogen atom density measurements by two-photon laser-induced fluorescence spectroscopy in atmospheric pressure dielectric barrier discharges of pure nitrogen
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10.1063/1.3225569
/content/aip/journal/jap/106/7/10.1063/1.3225569
http://aip.metastore.ingenta.com/content/aip/journal/jap/106/7/10.1063/1.3225569

Figures

Image of FIG. 1.
FIG. 1.

Simplified energy level diagram of atomic nitrogen and krypton indicating the excitation scheme and the observed fluorescence wavelengths.

Image of FIG. 2.
FIG. 2.

Schematic diagram of the experimental apparatus used in the TALIF diagnostics.

Image of FIG. 3.
FIG. 3.

Log-log plot of the N atom fluorescence signal at resonance as a function of the 206.65 nm laser beam energy. The slope of the line is 2.0 ± 0.1.

Image of FIG. 4.
FIG. 4.

Schematic of the DBD setup.

Image of FIG. 5.
FIG. 5.

Oscillogram of measured current , discharge current , applied voltage , gas voltage and laser pulse, (a) in the case of a TDBD and (b) in the case of a FDBD .

Image of FIG. 6.
FIG. 6.

Absolute density of ground state nitrogen atoms in a Townsend discharge as a function of the position from the discharge entrance, measured for three different gas flows of .

Image of FIG. 7.
FIG. 7.

Absolute density of ground state nitrogen atoms in a Townsend discharge at a given position and as a function of the gas flow (, ).

Image of FIG. 8.
FIG. 8.

Absolute density of ground state nitrogen atoms in a Townsend discharge as a function of the mean equivalent residence time or the mean energy dissipated in the gas for the given measurement position (. The gas flow and/or the position is varied).

Image of FIG. 9.
FIG. 9.

Effect of ○ the mean equivalent residence time with constant power and ● the varied power for a constant mean equivalent residence time (62 ms, is varied from ) on the absolute density of ground state nitrogen atoms in a Townsend discharge.

Image of FIG. 10.
FIG. 10.

Absolute density of ground state nitrogen atoms as a function of the residence time in the postdischarge area of a Townsend discharge (, gas flow and/or the position is varied). The symbols are experimental values; the curve corresponds to the calculated values from Eq. (8).

Image of FIG. 11.
FIG. 11.

Absolute density of ground state nitrogen atoms in a filamentary discharge as a function of the mean energy dissipated in the gas for the given measurement position (. The gas flow and/or the position is varied).

Tables

Generic image for table
Table I.

Values of the parameters involved in the N density calibration via krypton (Ref. 23). is the mean laser pulse energy (μJ) for which measurements have been done, ν is the photon frequency, is the transition probability of the observed fluorescence spectral channel, is the total transition probability of the excited state (e.g., inverse of the radiative lifetime), and are the respective densities of and Kr, and are the quenching coefficient of the atom analyzed (Kr or N) with respectively and Kr, is the total transmission of the collection optics at the wavelength corresponding to the analyzed atom (Kr or N), and η is the detector quantum efficiency at this wavelength.

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/content/aip/journal/jap/106/7/10.1063/1.3225569
2009-10-07
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Absolute nitrogen atom density measurements by two-photon laser-induced fluorescence spectroscopy in atmospheric pressure dielectric barrier discharges of pure nitrogen
http://aip.metastore.ingenta.com/content/aip/journal/jap/106/7/10.1063/1.3225569
10.1063/1.3225569
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