Time evolution of vibrational temperatures in a CO2 glow discharge measured with infrared absorption spectroscopy

B.L.M. Klarenaar, R. Engeln, D.C.M. van den Bekerom, M.C.M. Van De Sanden, A.S. Morillo-Candas, O. Guaitella

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Vibrational temperatures of CO2 are studied in a pulsed glow discharge by means of time-resolved in situ Fourier transform infrared spectroscopy, with a 10 μs temporal resolution. A method to analyze the infrared transmittance through vibrationally excited CO2 is presented and validated on a previously published CO2 spectrum, showing good agreement between fit and data. The discharge under study is pulsed with a typical duty cycle of 5-10 ms on-off, at 50 mA and 6.7 mbar. A rapid increase of the temperature of the asymmetric stretch vibration (T 3) is observed at the start of the pulse, reaching 1050 K, which is an elevation of 550 K above the rotational temperature () of 500 K. After the plasma pulse, the characteristic relaxation time of T 3 to strongly depends on the rotational temperature. By adjusting the duty cycle, the rotational temperature directly after the discharge is varied from 530 to 860 K, resulting in relaxation times between 0.4 and 0.1 ms. Equivalently, as the gas heats up during the plasma pulse, the elevation of T 3 above decreases strongly.

Originele taal-2Engels
Artikelnummer115008
Aantal pagina's11
TijdschriftPlasma Sources Science and Technology
Volume26
Nummer van het tijdschrift11
DOI's
StatusGepubliceerd - 26 okt 2017

Vingerafdruk

glow discharges
infrared absorption
absorption spectroscopy
infrared spectroscopy
pulses
relaxation time
temperature
cycles
temporal resolution
transmittance
adjusting
heat
vibration
gases

Citeer dit

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title = "Time evolution of vibrational temperatures in a CO2 glow discharge measured with infrared absorption spectroscopy",
abstract = "Vibrational temperatures of CO2 are studied in a pulsed glow discharge by means of time-resolved in situ Fourier transform infrared spectroscopy, with a 10 μs temporal resolution. A method to analyze the infrared transmittance through vibrationally excited CO2 is presented and validated on a previously published CO2 spectrum, showing good agreement between fit and data. The discharge under study is pulsed with a typical duty cycle of 5-10 ms on-off, at 50 mA and 6.7 mbar. A rapid increase of the temperature of the asymmetric stretch vibration (T 3) is observed at the start of the pulse, reaching 1050 K, which is an elevation of 550 K above the rotational temperature () of 500 K. After the plasma pulse, the characteristic relaxation time of T 3 to strongly depends on the rotational temperature. By adjusting the duty cycle, the rotational temperature directly after the discharge is varied from 530 to 860 K, resulting in relaxation times between 0.4 and 0.1 ms. Equivalently, as the gas heats up during the plasma pulse, the elevation of T 3 above decreases strongly.",
keywords = "carbon dioxide plasma, Fourier transform infrared spectroscopy, glow discharge, vibrational temperature",
author = "B.L.M. Klarenaar and R. Engeln and {van den Bekerom}, D.C.M. and {Van De Sanden}, M.C.M. and A.S. Morillo-Candas and O. Guaitella",
year = "2017",
month = "10",
day = "26",
doi = "10.1088/1361-6595/aa902e",
language = "English",
volume = "26",
journal = "Plasma Sources Science and Technology",
issn = "0963-0252",
publisher = "Institute of Physics",
number = "11",

}

Time evolution of vibrational temperatures in a CO2 glow discharge measured with infrared absorption spectroscopy. / Klarenaar, B.L.M.; Engeln, R.; van den Bekerom, D.C.M.; Van De Sanden, M.C.M.; Morillo-Candas, A.S.; Guaitella, O.

In: Plasma Sources Science and Technology, Vol. 26, Nr. 11, 115008, 26.10.2017.

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

TY - JOUR

T1 - Time evolution of vibrational temperatures in a CO2 glow discharge measured with infrared absorption spectroscopy

AU - Klarenaar, B.L.M.

AU - Engeln, R.

AU - van den Bekerom, D.C.M.

AU - Van De Sanden, M.C.M.

AU - Morillo-Candas, A.S.

AU - Guaitella, O.

PY - 2017/10/26

Y1 - 2017/10/26

N2 - Vibrational temperatures of CO2 are studied in a pulsed glow discharge by means of time-resolved in situ Fourier transform infrared spectroscopy, with a 10 μs temporal resolution. A method to analyze the infrared transmittance through vibrationally excited CO2 is presented and validated on a previously published CO2 spectrum, showing good agreement between fit and data. The discharge under study is pulsed with a typical duty cycle of 5-10 ms on-off, at 50 mA and 6.7 mbar. A rapid increase of the temperature of the asymmetric stretch vibration (T 3) is observed at the start of the pulse, reaching 1050 K, which is an elevation of 550 K above the rotational temperature () of 500 K. After the plasma pulse, the characteristic relaxation time of T 3 to strongly depends on the rotational temperature. By adjusting the duty cycle, the rotational temperature directly after the discharge is varied from 530 to 860 K, resulting in relaxation times between 0.4 and 0.1 ms. Equivalently, as the gas heats up during the plasma pulse, the elevation of T 3 above decreases strongly.

AB - Vibrational temperatures of CO2 are studied in a pulsed glow discharge by means of time-resolved in situ Fourier transform infrared spectroscopy, with a 10 μs temporal resolution. A method to analyze the infrared transmittance through vibrationally excited CO2 is presented and validated on a previously published CO2 spectrum, showing good agreement between fit and data. The discharge under study is pulsed with a typical duty cycle of 5-10 ms on-off, at 50 mA and 6.7 mbar. A rapid increase of the temperature of the asymmetric stretch vibration (T 3) is observed at the start of the pulse, reaching 1050 K, which is an elevation of 550 K above the rotational temperature () of 500 K. After the plasma pulse, the characteristic relaxation time of T 3 to strongly depends on the rotational temperature. By adjusting the duty cycle, the rotational temperature directly after the discharge is varied from 530 to 860 K, resulting in relaxation times between 0.4 and 0.1 ms. Equivalently, as the gas heats up during the plasma pulse, the elevation of T 3 above decreases strongly.

KW - carbon dioxide plasma

KW - Fourier transform infrared spectroscopy

KW - glow discharge

KW - vibrational temperature

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DO - 10.1088/1361-6595/aa902e

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