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Emission of the third continuum of argon excited by a pulsed volume discharge
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Image of FIG. 1.
FIG. 1.

Electrical circuit for the discharge excitation. Two schemes were used for different regimes: high-current (a) and low-current (b) excitation. The lower inset shows the voltage on the discharge gap for 4 bar of Ar [scheme (a) ].

Image of FIG. 2.
FIG. 2.

Schematic of VUV-visible spectroscopic diagnostic apparatus.

Image of FIG. 3.
FIG. 3.

Side-view images in the visible light of the discharge. Time point—16 ns from the beginning of the discharge; exposure time—4 ns. (a) High-current excitation by the low-impedance circuit (a) in Fig. 1, Ar 4 bar. (b) Low-current excitation by the circuit (b) in Fig. 1, Ar 0.5 bar.

Image of FIG. 4.
FIG. 4.

Emission spectra of the homogeneous volume discharge at 4 bar of Ar [excitation scheme (a) ] measured by (a) VUV monochromator, solar blind VUV and UV photomultipliers. (b) ICCD camera and UV-visible spectrograph.

Image of FIG. 5.
FIG. 5.

Continua spectra of the discharge at different gas pressures. The intensity scale is the same for all the curves.

Image of FIG. 6.
FIG. 6.

Time-dependent spectra in the UV spectral range from the negative glow zone of the discharge in Ar at 0.25 bar, excited by the scheme (b) in Fig. 1.

Image of FIG. 7.
FIG. 7.

Experimental data for the breakdown voltage and E/N parameter for the discharge at different Ar pressure (discharge gap is 1.4 mm). The right-hand branch of the Paschen curve for the static breakdown in Ar is shown (data from Ref. 34).

Image of FIG. 8.
FIG. 8.

The maximal possible energy of electrons (points) in Ar according to the following conditions. (1) Solid curve is calculated from formula (4). (2) Dashed curve is the approximation of the maximal achievable energy of electrons, limited by the cathode fall potential (column 4 in Table I).

Image of FIG. 9.
FIG. 9.

Temporal behavior of the third continuum 190 nm band in Ar at different gas pressures. The solid lines for pressures of 0.17–0.5 bar correspond to the model calculations according to Eq. (5).

Image of FIG. 10.
FIG. 10.

Emission spectra, measured at two different conditions: 0.17 bar of Ar, the time point in Fig. 9 with gas circulation through the getter; 8 bar of Ar, late afterglow stage, without gas circulation through the getter.


Generic image for table
Table I.

Characteristics of the cathode layer for the pulsed discharge at different Ar pressures.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Emission of the third continuum of argon excited by a pulsed volume discharge