Kinetic study of CO2 plasmas under non-equilibrium conditions. II. Input of vibrational energy

M. Grofulović, T. Silva, B. L.M. Klarenaar, A. S. Morillo-Candas, O. Guaitella, R. Engeln, C. D. Pintassilgo, V. Guerra

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This is the second of two papers presenting the study of vibrational energy exchanges in non-equilibrium CO2 plasmas in low-excitation conditions. The companion paper addresses a theoretical and experimental investigation of the time relaxation of ∼70 individual vibrational levels of ground-state CO molecules during the afterglow of a pulsed DC glow discharge, operating at pressures of a few Torr and discharge currents around 50 mA, where the rate coefficients for vibration-translation (V-T) and vibration-vibration (V-V) energy transfers among these levels are validated (Silva et al 2018 Plasma Sources Sci. Technol. 27 015019). Herein, the investigation is focused on the active discharge, by extending the model with the inclusion of electron impact processes for vibrational excitation and de-excitation (e-V). The time-dependent calculated densities of the different vibrational levels are compared with experimental data obtained from time-resolved in situ Fourier transform infrared spectroscopy. It is shown that the vibrational temperature of the asymmetric stretching mode is always larger than the vibrational temperatures of the bending and symmetric stretching modes along the discharge pulse - the latter two remaining very nearly the same and close to the gas temperature. The general good agreement between the model predictions and the experimental results validates the e-V rate coefficients used and provides assurance that the proposed kinetic scheme provides a solid basis to understand the vibrational energy exchanges occurring in CO2 plasmas.

Originele taal-2Engels
Artikelnummer115009
Aantal pagina's13
TijdschriftPlasma Sources Science and Technology
Volume27
Nummer van het tijdschrift11
DOI's
StatusGepubliceerd - 12 nov 2018

Citeer dit

Grofulović, M., Silva, T., Klarenaar, B. L. M., Morillo-Candas, A. S., Guaitella, O., Engeln, R., ... Guerra, V. (2018). Kinetic study of CO2 plasmas under non-equilibrium conditions. II. Input of vibrational energy. Plasma Sources Science and Technology, 27(11), [115009]. https://doi.org/10.1088/1361-6595/aadb60
Grofulović, M. ; Silva, T. ; Klarenaar, B. L.M. ; Morillo-Candas, A. S. ; Guaitella, O. ; Engeln, R. ; Pintassilgo, C. D. ; Guerra, V. / Kinetic study of CO2 plasmas under non-equilibrium conditions. II. Input of vibrational energy. In: Plasma Sources Science and Technology. 2018 ; Vol. 27, Nr. 11.
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title = "Kinetic study of CO2 plasmas under non-equilibrium conditions. II. Input of vibrational energy",
abstract = "This is the second of two papers presenting the study of vibrational energy exchanges in non-equilibrium CO2 plasmas in low-excitation conditions. The companion paper addresses a theoretical and experimental investigation of the time relaxation of ∼70 individual vibrational levels of ground-state CO molecules during the afterglow of a pulsed DC glow discharge, operating at pressures of a few Torr and discharge currents around 50 mA, where the rate coefficients for vibration-translation (V-T) and vibration-vibration (V-V) energy transfers among these levels are validated (Silva et al 2018 Plasma Sources Sci. Technol. 27 015019). Herein, the investigation is focused on the active discharge, by extending the model with the inclusion of electron impact processes for vibrational excitation and de-excitation (e-V). The time-dependent calculated densities of the different vibrational levels are compared with experimental data obtained from time-resolved in situ Fourier transform infrared spectroscopy. It is shown that the vibrational temperature of the asymmetric stretching mode is always larger than the vibrational temperatures of the bending and symmetric stretching modes along the discharge pulse - the latter two remaining very nearly the same and close to the gas temperature. The general good agreement between the model predictions and the experimental results validates the e-V rate coefficients used and provides assurance that the proposed kinetic scheme provides a solid basis to understand the vibrational energy exchanges occurring in CO2 plasmas.",
keywords = "CO decomposition, CO plasma, low-temperature plasma, modeling, vibrational kinetics",
author = "M. Grofulović and T. Silva and Klarenaar, {B. L.M.} and Morillo-Candas, {A. S.} and O. Guaitella and R. Engeln and Pintassilgo, {C. D.} and V. Guerra",
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Grofulović, M, Silva, T, Klarenaar, BLM, Morillo-Candas, AS, Guaitella, O, Engeln, R, Pintassilgo, CD & Guerra, V 2018, 'Kinetic study of CO2 plasmas under non-equilibrium conditions. II. Input of vibrational energy', Plasma Sources Science and Technology, vol. 27, nr. 11, 115009. https://doi.org/10.1088/1361-6595/aadb60

Kinetic study of CO2 plasmas under non-equilibrium conditions. II. Input of vibrational energy. / Grofulović, M.; Silva, T.; Klarenaar, B. L.M.; Morillo-Candas, A. S.; Guaitella, O.; Engeln, R.; Pintassilgo, C. D.; Guerra, V.

In: Plasma Sources Science and Technology, Vol. 27, Nr. 11, 115009, 12.11.2018.

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

TY - JOUR

T1 - Kinetic study of CO2 plasmas under non-equilibrium conditions. II. Input of vibrational energy

AU - Grofulović, M.

AU - Silva, T.

AU - Klarenaar, B. L.M.

AU - Morillo-Candas, A. S.

AU - Guaitella, O.

AU - Engeln, R.

AU - Pintassilgo, C. D.

AU - Guerra, V.

PY - 2018/11/12

Y1 - 2018/11/12

N2 - This is the second of two papers presenting the study of vibrational energy exchanges in non-equilibrium CO2 plasmas in low-excitation conditions. The companion paper addresses a theoretical and experimental investigation of the time relaxation of ∼70 individual vibrational levels of ground-state CO molecules during the afterglow of a pulsed DC glow discharge, operating at pressures of a few Torr and discharge currents around 50 mA, where the rate coefficients for vibration-translation (V-T) and vibration-vibration (V-V) energy transfers among these levels are validated (Silva et al 2018 Plasma Sources Sci. Technol. 27 015019). Herein, the investigation is focused on the active discharge, by extending the model with the inclusion of electron impact processes for vibrational excitation and de-excitation (e-V). The time-dependent calculated densities of the different vibrational levels are compared with experimental data obtained from time-resolved in situ Fourier transform infrared spectroscopy. It is shown that the vibrational temperature of the asymmetric stretching mode is always larger than the vibrational temperatures of the bending and symmetric stretching modes along the discharge pulse - the latter two remaining very nearly the same and close to the gas temperature. The general good agreement between the model predictions and the experimental results validates the e-V rate coefficients used and provides assurance that the proposed kinetic scheme provides a solid basis to understand the vibrational energy exchanges occurring in CO2 plasmas.

AB - This is the second of two papers presenting the study of vibrational energy exchanges in non-equilibrium CO2 plasmas in low-excitation conditions. The companion paper addresses a theoretical and experimental investigation of the time relaxation of ∼70 individual vibrational levels of ground-state CO molecules during the afterglow of a pulsed DC glow discharge, operating at pressures of a few Torr and discharge currents around 50 mA, where the rate coefficients for vibration-translation (V-T) and vibration-vibration (V-V) energy transfers among these levels are validated (Silva et al 2018 Plasma Sources Sci. Technol. 27 015019). Herein, the investigation is focused on the active discharge, by extending the model with the inclusion of electron impact processes for vibrational excitation and de-excitation (e-V). The time-dependent calculated densities of the different vibrational levels are compared with experimental data obtained from time-resolved in situ Fourier transform infrared spectroscopy. It is shown that the vibrational temperature of the asymmetric stretching mode is always larger than the vibrational temperatures of the bending and symmetric stretching modes along the discharge pulse - the latter two remaining very nearly the same and close to the gas temperature. The general good agreement between the model predictions and the experimental results validates the e-V rate coefficients used and provides assurance that the proposed kinetic scheme provides a solid basis to understand the vibrational energy exchanges occurring in CO2 plasmas.

KW - CO decomposition

KW - CO plasma

KW - low-temperature plasma

KW - modeling

KW - vibrational kinetics

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U2 - 10.1088/1361-6595/aadb60

DO - 10.1088/1361-6595/aadb60

M3 - Article

VL - 27

JO - Plasma Sources Science and Technology

JF - Plasma Sources Science and Technology

SN - 0963-0252

IS - 11

M1 - 115009

ER -