Instantaneous and delayed responses of line intensities to interruption of the RF power in an argon inductively coupled plasma

Fey, F.H.A.G.; Stoffels, WW Winfred; Mullen, J.A.M. van der; Sude, B. van der; Schram, D.C.

doi:10.1016/0584-8547(91)80088-k

Cited by 79 publications

(41 citation statements)

References 26 publications

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“…6 on the right. Obtained values (approximately 22 m · s -1 ) are slightly higher than typical values for the ICP (approximately 14 m · s -1 [13]. A limitation of this method for determining the gas velocity however, is that more downstream in the plasma the intensity of the delayed response becomes weaker and the peak becomes broader.…”

Section: Resultsmentioning

confidence: 72%

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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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Section: Resultsmentioning

confidence: 72%

“…However, unlike for measurements performed on an ICP [13], in TIA plasmas the duration of the Saha-jump is too short compared to the resolution of the MCS and the decay time of the generator to determine the height of the jump with satisfactory accuracy. Therefore the presented measurements cannot be used to determine this temperature ratio.…”

Section: Resultsmentioning

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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“…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%

“…This means that in a pLTE argon plasma the relaxation process following a power interruption causes an increase in the excited state densities and thus an increase (a jump) in line emission. This effect is called the Saha response [40]. Figure 2 sketches the development of the line emission during a relaxation experiment in pLTE.…”

Section: Saha Responsementioning

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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“…Investigation on transient extinction conditions in an inductively coupled argon plasma, by Meubus [4]; power modulation (0.6-1.8 kW of plate power) effect on electron's temperature and density of an 18-mm diameter inductively coupled plasma (ICP), by De Regt et al [5]; spectrochemical analyzes for modulation, by Fey et al [6]; and coil current modulation effect upon the atomic argon line intensity at 751 nm by Sakuta et al [7] and Ishigaki et al [8], are some works to be noted.…”

Section: Introductionmentioning

confidence: 99%

Responses of a long-coil pulse-modulated induction plasma

Paul

Hossain

Hashimoto

et al. 2001

IEEE Trans. Plasma Sci.

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Abstract-Radio-frequency inductively coupled plasma in a pulse modulated approach was generated by a MOSFET inverter supply of high electric efficiency. The plasma torch has an extremely long coil region of 153 mm, which is an attractive feature for advanced materials processing, especially for better and more efficient vaporizing of solids. The operating conditions were: argon flow of 80 or 90 L/m at atmospheric pressure; supply power of 30 kW; and pulse on-time of 10 ms at 67% duty factor. Spectroscopic measurements were carried out to determine the temporal plasma properties, including the effects of shimmer current level (SCL) upon the spectral intensities. Additionally, a time-dependent two-dimensional numerical model was solved for the same operating conditions employed in the experiment to predict and compare the plasma properties. Pulsed plasma dissipation sustained for a minimum SCL of 43% for 80 L/m gas flow-rate, and at any level below 43%, the plasma disappeared. Temporal variation of argon line intensities at 751 and 763.5 nm is similar, though the upper level intensity of the former one was significantly stronger than the latter. Intensified change of intensity is found at lower SCL because of higher change in the coil current and, in turn, in the plasma power. The predicted intensity of the 751-nm argon line showed similar behavior to the experimental intensity though the response around the instant of on-pulsation is somewhat slower.

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Instantaneous and delayed responses of line intensities to interruption of the RF power in an argon inductively coupled plasma

Abstract: Instantaneous and delayed responses of line intensities to interruption of the RF power in an argon inductively coupled plasma. Spectrochimica Acta.

Cited by 79 publications

References 26 publications

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

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

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

Responses of a long-coil pulse-modulated induction plasma

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