Spectroscopic Study of CO2 Decomposition in Sealed-off CO2 Lasers

Kylián, Ondřej; Leys, Christophe; Hrachová, V.

doi:10.1002/1521-3986(200107)41:4<407::aid-ctpp407>3.0.co;2-r

Cited by 3 publications

(3 citation statements)

References 25 publications

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“…Morvova [21] studied the development with time of the conversion chemistry in dc corona discharges of CO/air and CO 2 /air mixtures using a FTIR absorption spectrometer. Recently, Kylian et al [23] investigated the time evolution and the steady state of the CO 2 decomposition in dc glow discharges in sealed-off CO 2 laser mixtures by means of time-resolved optical emission spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

Absorption spectroscopic studies of carbon dioxide conversion in a low pressure glow discharge using tunable infrared diode lasers

Hempel

Röpcke

Miethke

et al. 2002

Plasma Sources Sci. Technol.

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The time and spatial dependence of the chemical conversion of CO 2 to CO were studied in a closed glow discharge reactor (p = 50 Pa, I = 2-30 mA) consisting of a small plasma zone and an extended stationary afterglow. Tunable infrared diode laser absorption spectroscopy has been applied to determine the absolute ground state concentrations of CO and CO 2. After a certain discharge time an equilibrium of the concentrations of both species could be observed. The spatial dependence of the equilibrium CO concentration in the afterglow was found to be varying less than 10%. The feed gas was converted to CO more predominantly between 43% and 60% with increasing discharge current, forming so-called quasi-equilibrium states of the stable reaction products. The formation time of the stable gas composition also decreased with the current. For currents higher than 10 mA the conversion rate of CO 2 to CO was estimated to be 1.2 × 10 13 molecules J −1. Based on the experimental results, a plasma chemical modelling has been established.

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Section: Introductionmentioning

confidence: 99%

Absorption spectroscopic studies of carbon dioxide conversion in a low pressure glow discharge using tunable infrared diode lasers

Hempel

Röpcke

Miethke

et al. 2002

Plasma Sources Sci. Technol.

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“…It follows from the above-mentioned facts that investigating the destruction of the CO 2 molecule in the dependence on the creation of the CO molecule is an interesting topic [3]. The main aim of this contribution is to study intensities of second positive system of molecular nitrogen as well as intensities of Angström band of CO molecules in the dependence on pressure and current.…”

Section: Introductionmentioning

confidence: 97%

Study of laser mixture in glow discharge at low and middle pressures in silica and pyrex discharge tubes

2006

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The positive column of the DC glow discharge sustained in CO 2 laser mixture (containing CO 2 , N 2 and He at the ratio of 6:24:70) has been studied in pressure range 130÷1350 Pa and for discharge currents in range 10 ÷ 50 mA in two discharge tubes of the same shape, made from two different materials. Our main goal was the study of spectra by means of optical emission spectroscopy. We have focused on the investigation of intensities of spectral bands of the second positive system of molecular nitrogen corresponding to the transitions C 3 Π→B 3 Π and Angström band of CO molecules (transitions B 1 Σ→A 1 Π) in reference to important role of this molecules in the discharge. It has been found that intensity of nitrogen bands decreases with increasing pressure and with decreasing current. It was possible to estimate vibrational temperature T vib from measured intensities of above -mentioned bands of molecular nitrogen. It was observed that T vib increases with increasing discharge current and slightly decreases with increasing pressure.The other result of our measurement was fact that intensity of Angström band of CO molecules decreases with increasing pressure and increases with increasing current. No significant role of the material of the discharge tubes was found.

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“…Various plasma diagnostics with a laser-based system have been reported by active research groups. [9][10][11][12][13][14][15][16][17][18] Moreover, in order to analyze temperatures of low-excitation density plasma (including low-pressure combustion gas), real-time measurements by employing distributed-feedback (DFB) lasers have been successfully demonstrated. [19][20][21][22][23][24] We therefore observed the absorption lines of CO 2 in discharge-excited medium for continuous-wave (CW) laser operation using a 1.57-mm-wavelength DFB laser.…”

Section: Introductionmentioning

confidence: 99%

Temperature Analysis of Laser Gain Plasma Medium in a Slab-Type RF Discharge Excited CO₂ Laser Using Near Infrared Diode-Laser Absorption Spectroscopy

Yasuda¹,

Nozue²,

Fujishiro³

et al. 2010

Jpn. J. Appl. Phys.

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We construct a kink solution on a non-BPS D-brane using Berkovits' formulation of superstring field theory in the level truncation scheme. The tension of the kink reproduces 95% of the expected BPS D-brane tension. We also find a lump-like solution which is interpreted as a kink-antikink pair, and investigate some of its properties. These results may be considered as successful tests of Berkovits' superstring field theory combined with the modified level truncation scheme.

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Spectroscopic Study of CO2 Decomposition in Sealed-off CO2 Lasers

Cited by 3 publications

References 25 publications

Absorption spectroscopic studies of carbon dioxide conversion in a low pressure glow discharge using tunable infrared diode lasers

Absorption spectroscopic studies of carbon dioxide conversion in a low pressure glow discharge using tunable infrared diode lasers

Study of laser mixture in glow discharge at low and middle pressures in silica and pyrex discharge tubes

Temperature Analysis of Laser Gain Plasma Medium in a Slab-Type RF Discharge Excited CO₂ Laser Using Near Infrared Diode-Laser Absorption Spectroscopy

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Spectroscopic Study of CO2 Decomposition in Sealed-off CO2 Lasers

Cited by 3 publications

References 25 publications

Absorption spectroscopic studies of carbon dioxide conversion in a low pressure glow discharge using tunable infrared diode lasers

Absorption spectroscopic studies of carbon dioxide conversion in a low pressure glow discharge using tunable infrared diode lasers

Study of laser mixture in glow discharge at low and middle pressures in silica and pyrex discharge tubes

Temperature Analysis of Laser Gain Plasma Medium in a Slab-Type RF Discharge Excited CO2 Laser Using Near Infrared Diode-Laser Absorption Spectroscopy

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Temperature Analysis of Laser Gain Plasma Medium in a Slab-Type RF Discharge Excited CO₂ Laser Using Near Infrared Diode-Laser Absorption Spectroscopy