Determination of nitrogen V–V transfer rates by stimulated Raman pumping

Ahn, Tai; Adamovich, Igor V.; Lempert, Walter R.

doi:10.1016/j.chemphys.2003.11.029

Cited by 65 publications

(59 citation statements)

References 11 publications

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“…A qualitative difference between this work and previously reported N 2 measurements [15] is that O 2 molecules are not the only species present in the sample. Interspecies O 2 -N 2 transfer, while slow, should therefore be considered for both V-T and V-V processes.…”

Section: Kinetic Modeling and Rate Inferencecontrasting

confidence: 53%

“…1, is similar to that described in [15]. Approximately 200 mJ/pulse of the second harmonic output (532 nm) of a Q-switched Nd:YAG laser passes through a high pressure (70 bar) stimulated Raman shifting cell [20] containing a 1:1 mixture of O 2 :He.…”

Section: Methodsmentioning

confidence: 94%

“…For example, for the resonant V-V exchange, symbolized by k 1;0 0;1 , previously reported room temperature values spanned the range 9 Â 10 À15 cm 3 s À1 6 k 0;1 1;0 6 1:5Â 10 À13 cm 3 s À1 [15]. Using the new apparatus, two sets of experimental time-dependent VDF data, obtained at pressures of 300 and 760 Torr and for pump/probe time delays in the range .15-10 microseconds, were shown to agree well with predictions of Master Equation modeling using rate coefficients calculated by the semiclassical analytical forced harmonic oscillator (FHO) model of Adamovich [16] and the semi-classical trajectory calculation of Billing and Fisher [17].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Stimulated Raman scattering measurements of V–V transfer in oxygen

2006

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Section: Kinetic Modeling and Rate Inferencecontrasting

confidence: 53%

Section: Methodsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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Stimulated Raman scattering measurements of V–V transfer in oxygen

2006

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“…is relatively high, k VV 1:5 10 14 cm 3 =s [31] ( VV 1=k VV n N 0:5 ms for injection N 2 partial pressure of 5 torr), the resonant energy transfer process simply results in redistribution of N 2 vibrational energy among larger number of molecules, with energy still being locked in the nitrogen vibrational mode. Furthermore, with a constant mixture total pressure, the addition of vibrationally cold N 2 beyond the discharge should have the effect of slowing the main flow slightly as it traverses the discharge, allowing for somewhat higher specific energy loading in the main flow, with this additional energy then transferred into the vibrational mode of the cold molecules but no loss of vibrational quanta.…”

Section: Resultsmentioning

confidence: 99%

Nitrogen Vibrational Population Measurements in the Plenum of a Hypersonic Wind Tunnel

et al. 2012

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Picosecond coherent anti-Stokes Raman scattering is used for measurement of nitrogen vibrational distribution function in the plenum of a highly nonequilibrium Mach 5 wind-tunnel incorporating a high-pressure pulsersustainer discharge. First-level vibrational temperatures of the order of 2000 K are achieved in the 300 torr non-selfsustained plasma discharge generated by a high E=n (300 Td) nanosecond-pulsed discharge, which provides ionization in combination with an orthogonal low E=n (10 Td) dc sustainer discharge, which efficiently loads the nitrogen vibrational mode. It is also shown that operation with the nanosecond-pulsed plasma alone results in significant vibrational energy loading, with T v N 2 of the order of 1100 K. Downstream injection of CO 2 , NO, and H 2 results in vibrational relaxation, demonstrating the ability to further tailor the vibrational energy content of the flow. N 2 -NO vibration-vibration and N 2 -H 2 vibration-translation rates inferred from these data agree well with previous literature results to within the uncertainty in rotational-translational temperature.

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“…Table III shows a classification of all reaction processes for nitrogen-oxygen mixtures. [25][26][27][28][29][30][31][32][33][34] 055209-3 Yang, Zhou, and Dong AIP Advances 6, 055209 (2016) …”

Section: A Air Plasma Chemistrymentioning

confidence: 99%

Simulation study on nitrogen vibrational kinetics in a single nanosecond pulse high voltage air discharge

Yang

Zhou

2016

AIP Advances

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We report a simulation study on nitrogen vibrational kinetics N2(X1Σg+,v=0−12) in a single nanosecond pulse high voltage discharge in dry-air at a pressure of 100 Torr. Apart from the usual processes such as vibrational-vibrational exchange and vibrational-translational relaxation, the state-specific vibrational kinetics take into account the electronic-vibrational (E-V) process and chemical-vibrational process. The vibrational kinetics, coupled with electron Boltzmann equation solver, plasma chemical kinetics, and gas thermal balance are used to model the 100 ns discharge and its subsequent 10 ms afterglow. The self-consistent model shows good agreement with recent experimental results, with regard to time-resolved vibrational and translational temperature. According to the modeling results, The E-V mechanism has a small but non-negligible effect (about 2%) in rising of vibrational quanta in the early afterglow from 100 ns to 1μs. Another possible reason is the convective transport associated with the gas dynamic expansion in time delays around 1μs to 10 μs.

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Determination of nitrogen V–V transfer rates by stimulated Raman pumping

Cited by 65 publications

References 11 publications

Stimulated Raman scattering measurements of V–V transfer in oxygen

Stimulated Raman scattering measurements of V–V transfer in oxygen

Nitrogen Vibrational Population Measurements in the Plenum of a Hypersonic Wind Tunnel

Simulation study on nitrogen vibrational kinetics in a single nanosecond pulse high voltage air discharge

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