Diagnostics of rf microdischarge generated at atmospheric pressure

Slavíček, Pavel; Klíma, Miloš; Janča, Jan; Brablec, Antonı́n; Kadlecová, Jitka; Smékal, Petr

doi:10.1007/s10582-006-0326-9

Cited by 2 publications

(5 citation statements)

References 5 publications

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“…1) and that is why it was impossible to realize any measurements. 25 Previous studies 27,28 showed similar values of the measured N e , T e and T g as in this new work.…”

Section: Resultssupporting

confidence: 84%

“…1) and that is why there was impossible to realize any measurements [25]. Previous studies [27,28] showed similar values of the measured N e , T e and T g as in this new work. Error bars from the electron number density calculations are 55 approximately ± 15 %.…”

Section: Methodssupporting

confidence: 63%

“…In 30 the first mentioned case an optical emission diagnostics of the plasma is a very frequent approach. Herein the following parameters were measured: Gas temperature (T g ) from Boltzmann plots of rotational lines (Q 1 1-Q 1 9) of OH spectra, excitation temperature (T e ) from a set of argon atomic lines (603.21, 667.73, 35 675.28, 687.13 and 714.70 nm) and electron number density (N e ) from H β line Stark broadening yielded from the fitting the line intensity profile by the Voigt function [25, 27,28]. [3][4][5].…”

Section: Methodsmentioning

confidence: 99%

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Possibilities and analytical properties of the radiofrequency plasma pencil operating in the continuous and in the pulsed mode

Novosád

Hrdlička

Slavíček

et al. 2015

J. Anal. At. Spectrom.

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A two-electrodes capacitively coupled plasma jet discharge operated on a symmetrical sinus frequency carrier wave 13.56 MHz in a continual mode and in a pulsed mode is described in this paper. Internally pulsed mode was realised by the frequency modulation by the symmetrical rectangular frequency 22 kHz with duty cycle of 90 %. The pulsed mode has an effect on the electron number densities ranging from 1×10 14 to 1.2×10 15 in the pulse mode and from 1.7×10 14 to 1.0×10 15 cm -3 in the continuous mode, gas 10 temperatures 670-950 K in the pulse and 630-880 K in the continuous mode, excitation temperatures 3100-4250 K in the pulse and 3500-4280 K in the continuous mode, slopes and intercepts of the calibration lines and limits of detection and a weak effect on the coefficients of determination. All these parameters were measured in three different positions from the sample inlet of the plasma pencil. Most line intensities and the excitation temperature decreased while calcium lines and rotational temperature 15 calculated from OH radicals increased in the pulsed mode. These results indicate a strong interaction between calcium species and OH radicals. Analysis of real low mineralized waters showed almost proximity of the yielded results to those obtained by reference ICP-OES.

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“…1) and that is why it was impossible to realize any measurements. 25 Previous studies 27,28 showed similar values of the measured N e , T e and T g as in this new work.…”

Section: Resultssupporting

confidence: 84%

Section: Methodssupporting

confidence: 63%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Possibilities and analytical properties of the radiofrequency plasma pencil operating in the continuous and in the pulsed mode

Novosád

Hrdlička

Slavíček

et al. 2015

J. Anal. At. Spectrom.

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“…24,25 It has been investigated for several years from the physical point of view. 16,18,26 Measured spectra of this discharge always show molecular bands of nitrogen and OH, even in pure noble gases. Their intensities depend on an introduced admixture and the ambient atmosphere (usually air in the laboratory).…”

Section: Introductionmentioning

confidence: 85%

“…Results from optical emission or probe 27,28 diagnostics depend on both the respective discharge configuration and the collecting optics position with respect to the discharge body. However, general results for measured electron number density are around 10 20 m À3 , for the OH rotational temperatures 10 2 -10 3 K, 13,26 whereas excitation temperatures found from a set of argon lines, electron temperatures and vibrational temperatures from nitrogen bands are several thousands of K in temperature. 13 These discrepancies implicate it as a strongly non-isothermal plasma.…”

Section: Introductionmentioning

confidence: 98%

Plasma pencil as an excitation source for atomic emission spectrometry

Novosád

Hrdlička

Slavíček

et al. 2012

J. Anal. At. Spectrom.

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A 13.56 MHz plasma jet discharge, called a plasma pencil, was investigated. Rotational and excitation temperatures, and electron number densities for the pencil under and without sample load were calculated using OH band spectra, Ar lines and Hb line, respectively. The rotational temperatures were found to be relatively low at about 800 K, however, excitation temperatures exceeded 4000 K. The plasma was found to be strongly non-isothermal. Some atomic lines of elements were easily observed. Aqueous solution-based aerosols were incorporated into the plasma without desolvation. Standard water solutions of the elements were nebulized into the plasma. The Ar carrier gas and Ar plasma gas flow rates were 0.3 and 4.0 l min À1 , respectively. The forwarded power was 140 W. Intensities of the atomic lines, temperatures and electron number densities along the discharge tube were acquired in different positions from the aerosol entrance and an optimal position providing the best signal-to-noise ratio for each line intensity was established. Calibration dependencies for Ca, Cu, Mg, Zn, Li, Na were measured in the rage of 1-100 mg l À1 . 3-sigma detection limits in the best observation axial position were (mg l À1 ): 27 (Ca), 49 (Cu), 58 (Mg), 40 (Li), 13 (Na) and 180 (Zn).

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Diagnostics of rf microdischarge generated at atmospheric pressure

Cited by 2 publications

References 5 publications

Possibilities and analytical properties of the radiofrequency plasma pencil operating in the continuous and in the pulsed mode

Possibilities and analytical properties of the radiofrequency plasma pencil operating in the continuous and in the pulsed mode

Plasma pencil as an excitation source for atomic emission spectrometry

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