Magnetic-field modulation of a two-electrode direct-current plasma

Slinkman, David; Braid, Fred; Sacks, Richard

doi:10.1016/0584-8547(90)80065-q

Cited by 4 publications

(2 citation statements)

References 29 publications

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“…They mostly describe the effect of magnetic field on free burning arc plasma. Analytically useful arc plasma with continuous aerosol supply subjected to the influence of the magnetic field has been described in few recent papers [1], [2], [3], [4].…”

Section: Introductionmentioning

confidence: 99%

Emission Intensity Enhancement of DC Arc Plasma Induced by External Oscillating Magnetic Field

Stoiljković

Pavlovič

Savović

et al. 2007

Contrib. Plasma Phys.

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Key words DC arc plasma with aerosol supply, optical emission spectroscopy, plasma/magnetic field interaction. PACS 52.50.Dg Direct current (dc) arc plasma with continuous aerosol supply was coupled with an external oscillating magnetic field of a few tens of mT and a frequency of up to 1 kHz. Such configuration was used to alter the plasma-related radiative properties. The magnetic field was oriented perpendicularly to the electric field in the plasma and forced the arc column to oscillate as a whole with respect to the surrounding atmosphere. The magnitude of the applied magnetic field controls the amplitude of the oscillatory motion. Several parameters that can contribute to the radiative properties of the plasma were investigated (arc current, composition of aerosol introduced into the plasma, amplitude and frequency of the magnetic field applied). Spectral emission from different zones of the plasma column was measured by optical emission spectroscopy (OES). In comparison to steady-state plasma, the applied magnetic field induces an intensity enhancement of emission of the most analytes considered. The intensity enhancement is strongly affected by the amplitude and frequency of plasma column oscillations, i.e. by plasma column velocity. Also, intensity enhancement depends on the plasma zone observed.

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Section: Introductionmentioning

confidence: 99%

Emission Intensity Enhancement of DC Arc Plasma Induced by External Oscillating Magnetic Field

Stoiljković

Pavlovič

Savović

et al. 2007

Contrib. Plasma Phys.

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“…To minimize demixing through a more efficient dispersion of the analyte species into high temperature plasma regions and to enhance plasma-related radiative properties, an external magnetic field is often used. Recently, continuous wave magnetic field configurations have been applied to obtain rotation (up to 600 Hz) of the arc current channel [3,4] or both alternating and continuous wave magnetic fields to obtain oscillations (up to 500 Hz) or to shape the arc current channel [5,6] resulting in a more diffuse analytical plasma. A kind of oscillating dc arc plasma with aerosol supply has also been studied in detail, and a new interpretation of Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Monochromatic imaging technique used to study dc arc plasma under the influence of a transverse magnetic field

Stoiljković¹,

Pavlovič²,

Kuzmanović

et al. 2009

Plasma Sources Sci. Technol.

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The monochromatic imaging technique was used for diagnosing atmospheric pressure direct-current (dc) arc plasma with continuous aerosol analyte supply. The arc plasma was subjected to transverse sine wave variable magnetic fields of strengths up to 12 mT (peak-to-peak) and a frequency of 50 Hz. Spatially resolved spectral emission redistributions, coupled with intensity enhancements, are characterized in steady state and plasma exposed to the magnetic field. By a magnetic field oriented transversally to the electric field of the plasma column, fast lateral oscillatory swings of the current carrying plasma core are induced, which is followed by enhancement of the analyte emission. Depending on the strength of the applied magnetic field, appropriate elongations of the plasma core were generated. A digital camera, in conjunction with a slit-less monochromator, was used to capture unsaturated monochromatic images of the whole plasma volume during such oscillations. From the intensity emission patterns at different axial positions in the plasma, obtained for a series of magnetic field strengths, it was found that the magnitude of analyte emission enhancement depends primarily on the amplitude/velocity of the plasma core motion. However, it was clearly shown that the magnitude of the analyte emission enhancement at different axial positions is affected not only by the velocity of the plasma core motion but also by the discharge electric field orientation. This was confirmed when the electrode polarity was reversed. Regardless of the electric field orientation the bulk of the intensity enhancement occurs in the closer-to-cathode plasma region.

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Understanding spectroscopy with a view to rationalizing spectrochemical analysis: an abysmal adventure or a realistic ideal?

Boumans

1991

Spectrochimica Acta Part B: Atomic Spectroscopy

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Magnetic-field modulation of a two-electrode direct-current plasma

Cited by 4 publications

References 29 publications

Emission Intensity Enhancement of DC Arc Plasma Induced by External Oscillating Magnetic Field

Emission Intensity Enhancement of DC Arc Plasma Induced by External Oscillating Magnetic Field

Monochromatic imaging technique used to study dc arc plasma under the influence of a transverse magnetic field

Understanding spectroscopy with a view to rationalizing spectrochemical analysis: an abysmal adventure or a realistic ideal?

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