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Wyświetlanie 1-3 z 3
Tytuł:
Optical Emission Spectroscopy of Microwave (915 MHz) Plasma in Atmospheric Pressure Nitrogen with Addition of Ethanol Vapour
Autorzy:
Miotk, R.
Jasiński, M.
Mizeraczyk, J.
Powiązania:
https://bibliotekanauki.pl/articles/1366270.pdf
Data publikacji:
2014-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
52.50.Sw
52.70.Kz
Opis:
In this paper results of optical emission spectroscopic study of microwave 915 MHz plasma in atmospheric pressure nitrogen with an addition of ethanol vapour are presented. The plasma was generated in waveguide-supplied cylinder-type nozzleless microwave plasma source. The aim of research was to determine the rotational $T_{rot}$ and vibrational $T_{vib}$ temperatures of CN and $C_2$. A method called bubbling was employed to introduce alcohol (ethanol) into the plasma. The $T_{rot}$ and $T_{vib}$ were determined by comparing the measured and simulated spectra. Obtained rotational and vibrational temperatures of CN and $C_2$ were ranged from 4400 to 5400 K and from 2800 to 3400 K, respectively, depending on the location in the plasma and the microwave absorbed power $P_{A}$.
Źródło:
Acta Physica Polonica A; 2014, 125, 6; 1329-1331
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Properties of $γ-Fe_2O_3$ Nanopowder Synthesized by Atmospheric Microwave Torch Discharge
Autorzy:
David, B.
Schneeweiss, O.
Šantavá, E.
Jašek, O.
Powiązania:
https://bibliotekanauki.pl/articles/1419658.pdf
Data publikacji:
2012-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
52.50.Sw
81.07.Wx
76.80.+y
Opis:
A nanopowder containing $γ-Fe_2O_3$ particles was synthesized by adding a gas mixture of $H_2//Fe(CO)_5$ into a microwave torch discharge at 1 bar. The presence of $γ-Fe_2O_3$ phase was confirmed by powder X-ray diffraction (mean crystallite size $d_{XRD}$=24 nm). The dominating characteristic sextets of $γ-Fe_2O_3$ were identified in the Mössbauer spectrum taken at 5 K. The presence of pure $Fe_3O_4$ in the nanopowder was excluded. The Mössbauer spectrum taken at 5 K exhibited six times larger total spectrum area than the Mössbauer spectrum taken at 293 K. Zero field cooled/field cooled curves measured down to 4 K in the magnetic field of 7.9 kA/m are reported.
Źródło:
Acta Physica Polonica A; 2012, 122, 1; 9-11
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of $H_2:CH_4$ Plasma Composition by Means of Spatially Resolved Optical Spectroscopy
Autorzy:
Bogdanowicz, R.
Powiązania:
https://bibliotekanauki.pl/articles/1811532.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
85.60.-q
42.81.-i
07.57.-c
42.15.Eq
32.30.-r
52.50.Sw
81.05.Uw
Opis:
The system based on spatially resolved optical emission spectroscopy dedicated for in situ diagnostics of plasma assisted CVD processes is presented in this paper. Measurement system coupled with chemical vapour deposition chamber by dedicated fiber-optic paths enables investigation of spatial distribution of species densities ($H_x$, $H^+$, CH, $CH^+$) during chemical vapour deposition process. Experiments were performed for a various gas inlet configuration at range of microwave power up to 800 W. Spatially resolved optical spectroscopy results showed that inlet configuration based on injecting hydrogen in ECR region and methane in substrate area is the most efficient for $H^+$ and $CH_{3}^{+}$ excitation. The designed prototype of the spatially resolved optical spectroscopy system enables the high-sensitivity measurements of concentration of the species in the microwave plasma and can be used for optimisation of diamond-like carbon synthesis.
Źródło:
Acta Physica Polonica A; 2008, 114, 6A; A-33-A-38
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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