An active spectroscopical study on the plasma parameters of an ICP

Mullen, van der Jjam Joost; Regt, de Jm Hans

doi:10.1007/s0021663550532

Cited by 12 publications

(5 citation statements)

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“…During the following years it is used to examine the plasma of different arc discharges [33][34][35]. Among other applications, the method is later employed on cascaded arcs [20,22,[36][37][38], ICPs [39][40][41][42] and transferred arcs [43].…”

Section: Relaxation Methodsmentioning

confidence: 99%

A spatially resolved relaxation method for pLTE plasma diagnostics in free-burning arcs

Kühn

Kock

2006

J. Phys. D: Appl. Phys.

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We report on a relaxation method to determine the electron-to-gas temperature ratio in the near-cathode region of a low-current free-burning arc operated in argon under atmospheric pressure. We used an intensified CCD camera to record the relaxation process after a fast power-interruption of the discharge with a time resolution better than 1 µs. For the CCD images we applied an ABEL inversion procedure yielding 3D information about the temperature ratio β := T e /T g with a spatial resolution of 50 µm. We deduced spatially resolved values of β from the relaxation experiment using independently measured values of T e and n e , so we could determine all free parameters in the partial LTE model.

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Section: Relaxation Methodsmentioning

confidence: 99%

A spatially resolved relaxation method for pLTE plasma diagnostics in free-burning arcs

Kühn

Kock

2006

J. Phys. D: Appl. Phys.

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“…This ICP is much more voluminous than the described microwave plasmas and has a radius r p of approximately 1 cm and a height of 4 cm. Typical ICP parameters are given by n e = 10 21 m −3 , T e = 1 × 10 4 K and T h = (5-7) × 10 3 K (using a power input P = 1.3 kW and a total argon flow [Ar] = 13 l min −1 ) [12,13,[21][22][23].…”

Section: The Plasma Sourcesmentioning

confidence: 99%

“…Experimental results will be presented in section 4. Several experimental results will be compared to results previously obtained from a 100 MHz argon ICP [12,13,[21][22][23]. Conclusions will be given in section 5.…”

Section: Introductionmentioning

confidence: 98%

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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“…Within a very short time (< 1 µs) they will largely thermalize with heavy particles and will therefore be cooled down towards a temperature close to T h [11,12]. This instantaneous decrease in T e will affect the densities of excited states.…”

Section: → → →mentioning

confidence: 99%

“…4 a typical response to power interruption of a level with a Saha-like behavior is plotted [12]. Measurements are performed with a 100 MHz argon ICP operated at 1.3 kW [11].…”

Section: → → →mentioning

confidence: 99%

The influence of molecular gases and analytes on excitation mechanisms in atmospheric microwave sustained argon plasmas

Timmermans

Thomas

Jonkers

et al. 1998

Fresenius' Journal of Analytical Chemistry

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. (1998). The influence of molecular gases and analytes on excitation mechanisms in atmospheric microwave sustained argon plasmas. Fresenius' Journal of Analytical Chemistry, 362(5), 440-446. DOI: 10.1007/s002160051104General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Abstract The effect of introducing molecular compounds into argon plasmas has been studied using an expanding microwave induced plasma at atmospheric pressure. Besides the use of optical emission spectroscopy (OES), also the time dependent behavior of line intensities during power interruptions has been studied. From the measurements it is found that even an injection of small amounts of molecular compounds (> 0.5%) leads to important changes in excitation mechanisms in the plasma. It is also found that in the recombination zone downstream in the plasma an excitation mechanism which is independent of the electron density, e.g. excitation transfer from metastables or Penning ionization, must be responsible for the excitation of analytes.

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An active spectroscopical study on the plasma parameters of an ICP

Cited by 12 publications

References 13 publications

A spatially resolved relaxation method for pLTE plasma diagnostics in free-burning arcs

A spatially resolved relaxation method for pLTE plasma diagnostics in free-burning arcs

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

The influence of molecular gases and analytes on excitation mechanisms in atmospheric microwave sustained argon plasmas

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