Application of an inductively coupled argon plasma axial viewing absorption technique using a power modulated plasma

Rayson, Gary D.; Shen, Daniel Y.

doi:10.1016/0584-8547(92)80046-j

Cited by 9 publications

(3 citation statements)

References 13 publications

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“…The review by Farnsworth [27] discusses the diagnostic uses of modulation in ICPs and a summary of the limited analytical work that has been done. Moreover, an atomic absorption technique has been developed that utilizes axial viewing of ICPs incorporating linear-flow argon coolant gas using a power-modulated plasma discharge [7]. Limits of detection and linear dynamic ranges have been measured with this configuration for Ag, Cu, Mg, Sm, Pr and Ca and improvements of one to nearly four orders of magnitude have been realized.…”

Section: Temporal Evolutions Of Emission Intensities For Analytes Wit...mentioning

confidence: 99%

“…Schematic of the modulated arc discharge system. [7,8] has been thoroughly studied. Although the obtained results suggested the possibility of sensitivity improvement in power-modulated plasmas, a detailed study of this subject was only done by Rayson [7].…”

Section: Introductionmentioning

confidence: 99%

“…[7,8] has been thoroughly studied. Although the obtained results suggested the possibility of sensitivity improvement in power-modulated plasmas, a detailed study of this subject was only done by Rayson [7]. These days, understanding the behavior of the rf-ICP, when it is subject to variation in its power, has become an important topic of research [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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Delayed responses of analyte emission in a pulse-modulated direct-current argon arc at atmospheric pressure

Kuzmanović¹,

Savović²,

Pavlović³

et al. 2010

Plasma Sources Sci. Technol.

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A pulse-modulated direct-current argon arc burning at atmospheric pressure has been investigated by analyzing temporally and spatially resolved analyte emission responses in a millisecond time domain. The arc current was a rectangular pulse modulated between 9 and 3.5 A with a modulation period of 250 ms and a low current interval of up to 50 ms. Both positive and negative step modulation in current strongly affected the analyte emission. Delayed responses of representative analytes with ionization energies ranging from 6.5 to 10 eV have been studied. Depending on the analyte ionization energy and the plasma zone observed, a sudden current change was in most cases followed by a line intensity increase. The magnitude of this increase is correlated with changes in the ionization-recombination balance, the extent of demixing and the gas dynamics processes invoked by a current modulation. For analytes with medium and low ionization energies a current drop is accompanied by a large increase in signal-to-background ratio, which opens up the possibility of the use of arc current modulation for sensitivity improvement.

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Section: Temporal Evolutions Of Emission Intensities For Analytes Wit...mentioning

confidence: 99%