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Density of atoms in Ar*(3p54s) states and gas temperatures in an argon surfatron plasma measured by tunable laser spectroscopy
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Image of FIG. 1.
FIG. 1.

Scheme of the experimental setup. Two TDLs are combined and pass the plasma column perpendicular to the axis. The plasma tube can be moved with respect to the laser beams. Data collection system and vacuum equipment are not shown for clarity.

Image of FIG. 2.
FIG. 2.

Measurement procedure, recorded is the laser light with and without plasma, plasma light and background. Moreover the calibration signal from the Interferometer with the FSR of 0.3 GHz is shown. Experimental conditions are: 811.5 nm line; p = 80 millibars; z = 2 cm; 68 W input -wave power.

Image of FIG. 3.
FIG. 3.

Top: plot of absorbance versus frequency shift for: (a) 772.43 nm line at 0.65 millibars, fitted by a Gaussian function; (b) for 811.53 nm line at 105 millibars, fitted with a Voigt function. By the residue given below, it is clear that a good fit is obtained for 0.65 millibars, while at 105 millibars higher residues are present.

Image of FIG. 4.
FIG. 4.

as a function of axial position for different gas pressures. The error bars are decreasing with lower pressure down to 0.65 mbar where the error indication is smaller than the symbol size. For each pressure, the end of the plasma column is indicated by a vertical line.

Image of FIG. 5.
FIG. 5.

at the launcher position for different pressures from this experiment (full squares) and measured as described in Ref. 23 by Rayleigh scattering (circles).

Image of FIG. 6.
FIG. 6.

Absolute 1s3, 1s4, and 1s5 atom densities for gas pressures of 0.65, 4 and 10 millibars along the plasma column. The ends of the plasma columns are indicated by vertical lines.

Image of FIG. 7.
FIG. 7.

The same as in Fig. 6 but for gas pressures of 20, 60, and 105 millibars.

Image of FIG. 8.
FIG. 8.

The ratio versus the distance from the launcher, taking the gas temperature into account for the ground state density.

Image of FIG. 9.
FIG. 9.

n(1s3) and n(1s4) densities close to the launcher normalized to n(1s5) from the same position as function of pressure (symbol + lines). Indicated are the densities according to Boltzmann equilibrium and (TS) (dashed lines).

Image of FIG. 10.
FIG. 10.

Comparison of the n(1s5) with other measurements: TDLS results and data from self-absorption measurements from Ref. 8 as function of the distance to the end of the column (DEC).

Image of FIG. 11.
FIG. 11.

Comparison of the ratio at 5 pressures from the experiments (scatter) with a CRM (line) as a function of . Input parameter in the CRM is the experimentally determined, axially constant, 20 .

Image of FIG. 12.
FIG. 12.

The measured ratio close to the launcher for different pressures. Comparison is made by means of a full CRM knowing and from Thomson scattering ( is shown). For the normalization with respect to , the gas temperature is taken from the present work.


Generic image for table
Table I.

Summary of transition quantities used in this study.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Density of atoms in Ar*(3p54s) states and gas temperatures in an argon surfatron plasma measured by tunable laser spectroscopy