1887
banner image
No data available.
Please log in to see this content.
You have no subscription access to this content.
No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
Diode laser spectroscopic measurements of gas temperature in a pulsed dielectric barrier discharge using collisional broadening and shift of 1s3−2p2 and 1s5−2p7 argon transitions
Rent:
Rent this article for
USD
10.1063/1.4800556
/content/aip/journal/jap/113/14/10.1063/1.4800556
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/14/10.1063/1.4800556

Figures

Image of FIG. 1.
FIG. 1.

Schematics of the experimental setup. Note that the diode laser beam transects the centerline of the dielectric barrier discharge. This figure is reprinted with permission from R. J. Leiweke and B. N. Ganguly, Appl. Phys. Lett. 88, 131501 (2006). Copyright 2006 American Institute of Physics.

Image of FIG. 2.
FIG. 2.

The current-voltage waveforms for argon DBD operating at 500 Torr with 6 kV total applied voltage.

Image of FIG. 3.
FIG. 3.

Voigt line width (FWHM) dependence on neutral argon gas temperature. The dashed line demarcates the regions for which the Voigt line shape is predominately Gaussian or Lorentzian. The Lorentzian component of the Voigt line width was generated in accordance with the van der Waals impact limit approximation for argon assuming that the 1s 3 → 2p 2 transition is a non-overlapping line.

Image of FIG. 4.
FIG. 4.

Diode laser absorption scans at 30 Torr for the (a) 1s 3 → 2p 2 and (b) 1s 5 → 2p 7 transitions showing the simultaneous Voigt and baseline fits to the measured absorption coefficients to obtain estimates of both Doppler and Lorentzian line widths (FWHM).

Image of FIG. 5.
FIG. 5.

Measurement results for the 1s 3 → 2p 2 transition as a function of pressure from 5 to 30 Torr; (a) Doppler temperature estimates obtained from Voigt profile deconvolution and (b) the corresponding Lorentzian component (MHz, FWHM) reduced to 300 K. The reduced broadening coefficient obtained from a linear least squares fit is shown in (b).

Image of FIG. 6.
FIG. 6.

Measurement results for the 1s 5 → 2p 7 transition as a function of pressure from 5 to 30 Torr; (a) Doppler temperature estimates obtained from Voigt profile deconvolution and (b) the corresponding Lorentzian component (MHz, FWHM) reduced to 300 K. The reduced broadening coefficient obtained from a linear least squares fit is shown in (b).

Image of FIG. 7.
FIG. 7.

Photodiode signal vs. diode laser scan frequency illustrating the extent of the Voigt profile overlap between the 1s 3 → 2p 2 and 1s 5 → 2p 7 transitions at 50 Torr (1.25 kV), 200 Torr (2.35 kV), and 500 Torr (6 kV). The 1 Torr dc discharge transmission peak provides absolute reference frequencies which are used to measure the DBD peak frequency shift, shown at both 200 and 500 Torr.

Image of FIG. 8.
FIG. 8.

High pressure measurement results for the 1s 3 → 2p 2 transition; (a) The Lorentzian component (FWHM) obtained from Voigt fitting from 50 Torr up to the 300 Torr overlap limit, (b) the simultaneously measured peak frequency shifts vs. argon number density along with a linear least squares fit from which the temperature weighted reduced shift coefficient was obtained. The argon number density was obtained using the corresponding collision width temperature computed from (a) and the ideal gas law.

Image of FIG. 9.
FIG. 9.

High pressure measurement results for the 1s 5 → 2p 7 transition; (a) The Lorentzian component (FWHM) obtained from Voigt fitting from 50 Torr up to the 300 Torr overlap limit, (b) the simultaneously measured peak frequency shifts vs. argon number density along with a linear least squares fit from which the temperature weighted reduced shift coefficient was obtained. The argon number density was obtained using the corresponding collision width temperature computed from (a) and the ideal gas law.

Image of FIG. 10.
FIG. 10.

The ratios of the 1s 5 → 2p 7 to 1s 3 → 2p 2 measurements up to 500 Torr; (a) The peak collisional shift ratios appear to be independent of temperature and pressure, suggesting that collisional impact theory for isolated lines holds for discharge conditions up to 500 Torr, (b) The collisional broadening ratio begins to deviate from a constant value at 300 Torr due to the breakdown of the isolated line assumption for partially overlapping lines.

Tables

Generic image for table
Table I.

Estimated gas temperatures and 2σ uncertainties obtained from both peak frequency shift and collisional width measurements for both 1s 3-2p 2 and the 1s 5-2p 7 transitions.

Generic image for table
Table II.

Estimated peak argon metastable column densities from Voigt width measurements. Note that these values are not corrected for collisional quenching with ground state argon atom.

Loading

Article metrics loading...

/content/aip/journal/jap/113/14/10.1063/1.4800556
2013-04-08
2014-04-24
Loading

Full text loading...

This is a required field
Please enter a valid email address
752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Diode laser spectroscopic measurements of gas temperature in a pulsed dielectric barrier discharge using collisional broadening and shift of 1s3−2p2 and 1s5−2p7 argon transitions
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/14/10.1063/1.4800556
10.1063/1.4800556
SEARCH_EXPAND_ITEM