Fast two-wavelength CARS thermometry of gas discharges

Bodronosov, A. V.; Vereschagin, K. A.; Горшков, В. А.; Смирнов, В. В.; Khodataev, K. V.; Shakhatov, V. A.

doi:10.1070/qe1994v024n09abeh000253

Cited by 5 publications

(4 citation statements)

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“…The experimental values of T C corresponding to five vibrational levels lie in the range from 3700 to 5500 K. The temperatures T B , T V and T rot increase monotonically from 7000 K to 8000 K, from 1870 K to 4600 K and from 470 K to 940 K, respectively. The vibrational temperature T V is in good agreement with the measurements by CARS [8,28,29,46] at 50 mA. Figure 14 also demonstrates that the positive column of the dc discharge is a non-equilibrium plasma.…”

Section: Wavelength (Nm)supporting

confidence: 81%

“…The VDFs are slightly nonlinear at currents 17-40 mA: at 17 mA the level v C = 2 is depopulated as compared with the neighboring levels v C = 1 and v C = 3. Such a situation has already been observed in dc [46][47][48][49], radio-frequency [50] and microwave [23,24] discharges. In figure 13 the measured and calculated VDFs in the B 3 g state conform to those observed in [20,47,51,52].…”

Section: Wavelength (Nm)mentioning

confidence: 59%

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Study of positive column of glow discharge in nitrogen by optical emission spectroscopy and numerical simulation

Cicala¹,

Tommaso²,

Rainò³

et al. 2009

Plasma Sources Sci. Technol.

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Nitrogen dc discharges are investigated at a constant pressure of 3 Torr and a variable discharge current of 17-100 mA. Optical emission spectroscopy is employed to detect the excited species at four axial positions far from the cathode (25, 75, 125 and 175 mm) and to determine the rotational and translational temperatures and the vibrational distribution functions (VDFs) of the B 3 g and C 3 u states of the nitrogen molecule. A semiempirical level-to-level collisional-radiative model is used for the modeling of the collisional and radiative processes and the processing of data. It provides detailed information on the processes occurring in the dc discharge, calculates the nitrogen emission spectra, predicts the translational and rotational temperatures, the VDFs in the ground X 1 + g (v = 0-46) and electronic excited B 3 g (v B = 0-17) and C 3 u (v C = 0-4) states together with the corresponding vibrational temperatures T V , T B and T C . Theoretical emission spectra and VDFs of the B 3 g and C 3 u states are also in good agreement with the experimental ones. The main processes responsible for the VDFs are also established.

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Section: Wavelength (Nm)supporting

confidence: 81%

Section: Wavelength (Nm)mentioning

confidence: 59%

Study of positive column of glow discharge in nitrogen by optical emission spectroscopy and numerical simulation

Cicala¹,

Tommaso²,

Rainò³

et al. 2009

Plasma Sources Sci. Technol.

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“…The kinetic processes of vibrational excitation and relaxation of nitrogen molecules were investigated in [11][12][13][14][15] for the purpose of determining the overall cross section of electron excitation of vibrational levels and the rate constants of VV-exchange. A new method of CARS spectroscopy was suggested by Bodronosov et al [16] for performing proximate measurements of rotational and vibrational temperatures in a highly nonequilibrium plasma of various discharges in nitrogen. The possibility of determining the electron energy distribution function (EEDF) based on its correlation with VDF using the example of glow discharge plasma was investigated in [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

“…This study is a continuation of [13][14][15][16][17][18][19]. The method of CARS spectroscopy was used to investigate the VDF of nitrogen molecules in the ground electron state in plasma of dc glow discharge at pressure p = 3 to 30 torr.…”

Section: Introductionmentioning

confidence: 99%

CARS spectroscopy and optical interferometry of glow discharge plasma in nitrogen

Shakhatov

Gordeev

2006

High Temp

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The methods of spectroscopy of coherent anti-Stokes Raman scattering of light (CARS), optical interferometry, and emission spectroscopy are used to investigate the functions of distribution of nitrogen molecules over vibrational and rotational levels in the ground electron state. Also measured are the rate of gas heating and the distributions of gas and electron density and of translational temperature in the cross section of the discharge cuvette in plasma of dc glow discharge and contracted discharge. The obtained functions of distribution of nitrogen molecules over rotational and vibrational levels are well approximated by the Boltzmann and Treanor distributions, respectively. The radial dependence of the distribution of energy release in plasma of contracted discharge is suggested, and a solution is found of heat equation, which describes the distribution of translational temperature over the cuvette radius.

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Measurement of vibrational, gas, and rotational temperatures of H2 (X1Σg+) in radio frequency inductive discharge plasma by multiplex coherent anti-Stokes Raman scattering spectroscopy technique

et al. 2005

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Translational, rotational, and vibrational temperatures of H2 in radio frequency inductive discharge plasmas at pressures and power release ranges, respectively, of 0.5–8 torr and 0.5–2W∕cm3 have been measured by using multiplex coherent anti-Stokes Raman scattering (CARS) spectroscopy. Computational codes have been developed to determine the rotational and vibrational temperatures and to analyze H2 CARS spectrum for nonequilibrium conditions. The results show a decrease of the vibrational temperature from 4250 to 2800 K by increasing the pressure from 0.5 to 8 torr and a corresponding increase of the rotational temperature from 525 to 750 K.

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Fast two-wavelength CARS thermometry of gas discharges

Cited by 5 publications

References 0 publications

Study of positive column of glow discharge in nitrogen by optical emission spectroscopy and numerical simulation

Study of positive column of glow discharge in nitrogen by optical emission spectroscopy and numerical simulation

CARS spectroscopy and optical interferometry of glow discharge plasma in nitrogen

Measurement of vibrational, gas, and rotational temperatures of H2 (X1Σg+) in radio frequency inductive discharge plasma by multiplex coherent anti-Stokes Raman scattering spectroscopy technique

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