Energy transfer as a function of collision energy. III. State-to-state cross sections for rotational-to-translational energy transfer in HF+Ar

Barnes, Jack A.; Keil, Mark; Kutina, R. E.; Polanyi, J. C.

doi:10.1063/1.439047

Cited by 46 publications

(13 citation statements)

References 19 publications

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“…The SPS band R 2 branch lines with J > 10 and J < 30, recommended by several authors as the most suitable lines for T rot and T g measurement, were also analysed in this study. The measured state‐to‐state rate coefficients taking into account several scaling laws show that the collision transfers among the mentioned rotational levels of the C state can lead to thermal equilibrium for these rotational levels.…”

Section: Resultsmentioning

confidence: 99%

The analysis of nitrogen rotational and vibrational bands in a helium microhollow gas discharge

Majstorović

Jovović

Šišović

2017

Contrib. Plasma Phys

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Emission spectroscopy is applied to measure the gas temperature T g and the vibrational distribution of N2 (C 3Πu) and N2 +(B 2Σu +) excited states from a helium microhollow gas discharge (MHGD) at atmospheric pressure. The rotational temperature T rot of N2 + is determined from relative intensity of the R‐branch lines of the N2 +(B 2Σu +–X 2Σg +) bands at 427.81 and 419.91 nm and the well‐known Boltzmann plot (BP). Using the same diagnostic technique, the rotationally resolved N2(C 3Πu–B 3Πg) band at 380.49 nm is used to measure T rot. Under our experimental conditions, T g is equal to T rot = 550–650 K for nitrogen molecules and shows a slight increase with the discharge current in the current range 3–10 mA. From the intensity ratio of two consecutive vibrational bands of the same sequence, the N2(C 3Πu) and N2 +(B 2Σu +) vibrational temperature T vib = 3,700–4,000 K is determined. It has been found that N2 +(B 2Σu +) ions have non‐Boltzmann distribution in the helium MHGD, while N2(C 3Πu) molecules are populated according to the Boltzmann distribution. Following the Franck–Condon principle, the vibrational distribution of the ground state of N2(X 1Σg +) molecules has been determined from the N2(C 3Πu) distribution using the inversion matrix of elements q XC(ν,ν′).

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Section: Resultsmentioning

confidence: 99%

The analysis of nitrogen rotational and vibrational bands in a helium microhollow gas discharge

Majstorović

Jovović

Šišović

2017

Contrib. Plasma Phys

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“…where F J is the rotational energy of the J level. Several scaling laws have been proposed [23][24][25][26][27][28], including the power decay law,…”

Section: Gas Temperature Measurementsmentioning

confidence: 99%

Experimental and theoretical study of the effect of gas flow on gas temperature in an atmospheric pressure microplasma

Wang

Doll

Donnelly

et al. 2007

J. Phys. D: Appl. Phys.

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The dependence of gas temperature on gas flow through a direct current, slot-type, atmospheric pressure microplasma in helium or argon was investigated by a combination of experiments and modelling. Spatially resolved gas temperature profiles across the gap between the two electrodes were obtained from rotational analysis of N 2 (C 3 u → B 3 g) emission spectra, with small amounts of N 2 added as actinometer gas. In Ar/N 2 discharges, the N 2 (C 3 u v = 0 → B 3 g v = 0) emission spectra were fitted with a two-temperature population distribution of the N 2 (C) state, and the gas temperature was obtained from the 'low temperature' component of the distribution. Under the same input power of 20 kW cm −3 , the peak gas temperature in helium (∼650 K) was significantly lower than that in argon (over 1200 K). This reflects the much higher thermal conductivity of helium gas. The gas temperature decreased with increasing gas flow rate, more so in argon compared with helium. This was consistent with the fact that conductive heat losses dominate in helium microplasmas, while convective heat losses play a major role in argon microplasmas. A plasma-gas flow simulation of the microdischarge, including a chemistry set, a compressible Navier-Stokes (and mass continuity) equation and a convective heat transport equation, was also performed. Experimental measurements were in good agreement with simulation predictions.

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“…The rotational energy transfer state-tostate cross sections of Ar+HF(v=1, j=2)→Ar+HF(v ′ =1, j ′ =0−7) at collision energy of 0.174 eV. The experiment of relative scattering cross sections was measured by Barnes et al[4]. The last two columns were calculated by Viswanathan using IOSA and IOSAM method[18], respectively.…”

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confidence: 99%

Theoretical study on quantum dynamics for Ar-HF inelastic collision

Yang

Liu

Zhao

et al. 2019

Chinese Journal of Chemical Physics

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The integral cross sections and rate constants of pure rotational and ro-vibrational energy transfer processes for the Ar-HF system are thoroughly studied by using the timeindependent close coupling method based on our newly constructed potential energy surface. Compared to previous theoretical results, pure rotational transitions in this work achieve better agreement with the experimental data. For ro-vibrational energy transfer, it is found that quasi-resonant transitions dominate the cross sections in all cases. Furthermore, the vibrational-resolved rate constant of transition v=1→v=0 increases very quickly with the temperature from 100 K to 1500 K and is also in good agreement with the available experimental results.

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Energy transfer as a function of collision energy. III. State-to-state cross sections for rotational-to-translational energy transfer in HF+Ar

Abstract: Infrared laser pumping of a supersonic beam followed by infrared fluorescence was employed to measure the energy dependence of the R↔T energy transfer. (AIP)

Cited by 46 publications

References 19 publications

The analysis of nitrogen rotational and vibrational bands in a helium microhollow gas discharge

The analysis of nitrogen rotational and vibrational bands in a helium microhollow gas discharge

Experimental and theoretical study of the effect of gas flow on gas temperature in an atmospheric pressure microplasma

Theoretical study on quantum dynamics for Ar-HF inelastic collision

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