Analytical characterization of imploding thin-film plasma using spatially and temporally resolved spectrometry

Carney, Kevin; Goldberg, Joel M.

doi:10.1021/ac00127a044

Cited by 13 publications

(6 citation statements)

References 30 publications

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“…RESULTS AND DISCUSSION General Characteristics. The general operating properties of the plasma gun are quite similar to those found with the ITFP system (8)(9)(10)(11)(12). Measurements of the discharge current and plasma voltage waveforms were performed for a number of discharge conditions, revealing power dissipation behavior very much the same as observed previously with ITFP's (10).…”

Section: Methodssupporting

confidence: 60%

“…There is little evidence of self-reversal of any analyte lines, as was evident in ITFP spectra. The plasma gun spectra shown here resemble the spectra obtained from indirect measurements of the plasma expelled from the ITFP discharge tube (9). Thus, the plasma gun system should enable analytical emission measurements plasma plume) for a 7-kV, 50-µ discharge with 1.5 ¿ig of vanadium as VC.…”

Section: Methodssupporting

confidence: 56%

“…Spatially resolved spectra and emission profiles were obtained by using over-and-under mirror optical systems designed either to produce a high-fidelity image of the plasma on the spectrograph focal plane (14,15) or to provide a high degree of spatial zone discrimination using both an external slit on the optical rail (placed at the tangential focus) and the monochromator entrance slit (at the sagittal focus) (16). Both of these optical systems have been described in detail (8,9).…”

Section: Methodsmentioning

confidence: 99%

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Initial characterization of a plasma gun source for atomic spectroscopy

Goldberg¹,

Robinson²

1991

Anal. Chem.

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A plasma gun Is described and evaluated as an emission source suitable for direct solid sampling methods of spectrochemlcal analysis. Atomization occurs In the radially confined current-carrying portion of the plasma, and emission Is measured In the expelled, cooling plasma plume; this allows both spatial and temporal segregation of these competing processes. Temporally and spatially resolved spectroscopic studies of the emission from the plasma gun source are presented. The Initial plasma front Is expelled from the discharge tube at about 3000 m/s and then slows to about 700 m/s at a height of 8-10 mm. Plasma formation and Implosion processes result In the expulsion of a sharp, rapidly propagating pulse of plasma, which appears to combine or collide with plasma that Is being continuously expelled due to the oscillatory heating and cooling of the plasma In the discharge tube. Spatially resolved emission measurements show significant Increases In both continuum and line emission at heights greater than 10 mm. It Is suggested that this behavior Is due to both collislonal and optical reexcftatlon processes. It Is shown that masking of emission from the lower regions of the plume (0-10 mm) and gating emission from the plume after the first current half-cycle (after about 75 µ•) can enhance V(II) line-to-background ratios by almost 10-fold.AppNcatlon of the source to the direct qualitative analysis of a USGS reference rock sample (MAG-1, Marine Mud) Is presented.

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Section: Methodssupporting

confidence: 60%

Section: Methodssupporting

confidence: 56%

Section: Methodsmentioning

confidence: 99%

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Initial characterization of a plasma gun source for atomic spectroscopy

Goldberg¹,

Robinson²

1991

Anal. Chem.

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“…The derivative of the magnetic field intensity waveform was measured with a laboratory-constructed probe (23) and integrated on the Nicolet oscilloscope. Optical emission spectra were obtained by using the spatially resolved but temporally integrated spectrographic system available in our laboratory (see ref 24 for details) and recorded on Kodak SA-1 plates. Microphotometer traces were obtained by using the system described previously (21).…”

Section: Methodsmentioning

confidence: 99%

“…Production and Initial Characterization of a Laser-Induced Plasma in a Pulsed Magnetic Field for Atomic Spectrometry Kelly J. Mason and Joel M. Goldberg* Department of Chemistry, University of Vermont, Burlington, Vermont 05405 Electromagnetic compression techniques were evaluated as a means of enhancing the atomization characteristics of atmospheric pressure laser-induced plasmas. The production of pulsed magnetic fields by capacitive electrical discharge through multiple-turn solenoids was modeled enabling the production of peak magnetic fields between 50 and 100 kG using moderate discharge conditions (9.5 kV, 24 jtF) and easily attainable system inductances (1.5 jtH). The effects of a 69-kG pulsed magnetic field oriented perpendicular to the laser axis of a laser-induced plasma formed using an Al alloy sample were Investigated using spatially resolved but temporally integrated spectrographic methods.…”

mentioning

confidence: 99%