Analyte excitation in the inductively coupled plasma studied by power modulation

Olesik, John W.; Bradley, Kathryn R.

doi:10.1016/0584-8547(87)80078-2

Cited by 26 publications

(10 citation statements)

References 27 publications

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“…These results prompted us to attempt the observation of electron production and diffusion at positions above the load coil. The hot and cold zones observed at later times correspond to those previously observed in argon and analyte emission data [12,14]. The first four plots of the series, reproduced in Fig.…”

Section: Resultssupporting

confidence: 83%

Energy transport in the inductively coupled plasma

1989

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Time-and space-resolved electron density measurements, made both above the load coil and in the load coil region of a pulsed inductively coupled plasma, are presented. These data, coupled with argon and calcium emission data, give values for the rates of both radial and vertical transport in the plasma. The data indicate that analyte emission behavior is governed primarily by the rate at which the central channel can be heated through radial transport processes. The electron densities measured in the load coil region agree well with electron densities calculated by models assuming local thermodynamic equilibrium, but agree poorly with non-equilibrium models. Some of the timedependent emission behavior observed in previous work with modulated plasmas is explained by non-uniform heating of argon in the load coil region.

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Section: Resultssupporting

confidence: 83%

Energy transport in the inductively coupled plasma

1989

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“…An image of the plasma was formed at the entrance slit of a 1-m spectrometer (McPherson Model 2061 with 1200 g/mm holographic grating) with a magnification of 0.33 using a 1-m focal length spherical mirror (Opeo Laboratory). The reflective optical system has been described previously (4). The entrance and exit slit widths were 50 µ .…”

Section: Methodsmentioning

confidence: 99%

“…Injecting an accurate amount, repeatedly, is difficult due to constant positioning of the level of the column. Therefore, it is better to use an internal standard for calculating the total amount injected (3,4).…”

Section: Aids For Analytical Chemistsmentioning

confidence: 99%

Supercritical fluid-based sample introduction for inductively coupled plasma atomic spectrometry

Olesik¹,

Olesik²

1987

Anal. Chem.

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“…The method that has been used is based on the study of the time-dependent behaviour of atomic line or molecular band intensities during short interruptions in the power generated by the microwave power supply. These measurements will be referred to as so-called 'power interruption (PI) experiments' [6][7][8][9][10][11][12][13]. Apart from insight into excitation balances, the PI experiments can reveal important aspects of transport phenomena, such as diffusion processes, heat conduction and convection.…”

Section: Introductionmentioning

confidence: 99%

Excitation balances and transport properties in atmospheric microwave-induced plasmas studied by power interruption experiments

Timmermans¹,

Mullen

Thomas

et al. 2000

Plasma Sources Sci. Technol.

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Atmospheric microwave-induced argon plasmas with and without analyte injection have been exposed to power interruption experiments in order to study transport processes and to reveal dominant excitation balances. From the time-dependent behaviour of line intensities due to electron cooling and quenching during the power interruption, it is found that electron loss channels, such as diffusion, convection and the dissociative recombination of molecular ions, are much larger than for inductively coupled plasmas. It is found that in the ionizing part of the plasma electron dominated mechanisms are responsible for the population of radiative levels. Significant changes in the responses to power interruption are observed when small amounts of molecular compounds are injected (>0.5%), probably due to a decrease of the electron density. Furthermore, it is found that in the recombination zone downstream in the plasma an electron-independent excitation mechanism, probably thermal excitation, is responsible for the population of radiative levels of analytes with relatively low excitation energies. From the downstream propagation of a disturbance created in the ionizing part of the plasma the local axial gas velocity has been determined. In the analyte excitation zone of the plasma typical velocities are around 25 m s −1 , whereas in the recombining zone velocities of 12-18 m s −1 are obtained.

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Analyte excitation in the inductively coupled plasma studied by power modulation

Cited by 26 publications

References 27 publications

Energy transport in the inductively coupled plasma

Energy transport in the inductively coupled plasma

Supercritical fluid-based sample introduction for inductively coupled plasma atomic spectrometry

Excitation balances and transport properties in atmospheric microwave-induced plasmas studied by power interruption experiments

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