Spectroscopic temperature measurements in oxygen discharges
| Autor: | M Vialle, A. Zellagui, M. Lefebvre, G. Gousset, Michel Touzeau, M. Pealat |
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| Rok vydání: | 1991 |
| Předmět: |
Glow discharge
Acoustics and Ultrasonics Mean kinetic temperature Absorption spectroscopy Chemistry Analytical chemistry Rotational temperature Condensed Matter Physics Surfaces Coatings and Films Electronic Optical and Magnetic Materials symbols.namesake Metastability Excited state symbols Raman spectroscopy Ground state |
| Zdroj: | Journal of Physics D: Applied Physics. 24:41-47 |
| ISSN: | 1361-6463 0022-3727 |
| Popis: | The rotational temperature of the excited state O2 (b1 Sigma g+, v=0) in an oxygen glow discharge is measured from the intensity distribution of the atmospheric A-band O2 (b1 Sigma g+, v=0) to O2(X3 Sigma g-, v=0) at lambda =760 nm. The kinetic temperature, often called the gas temperature is also deduced using vacuum ultraviolet absorption spectroscopy in the same experimental conditions: pressure p=0.5-5 torr, discharge current up to 100 mA and deposited power up to 2 W cm-1. It is shown that the rotational temperature of the A-band is equal to the rotational temperature of the molecular X3 Sigma g- ground state and of the first metastable as 1 Delta state measured by coherent anti-Stokes Raman spectroscopy. Since the kinetic temperature is in equilibrium with the rotational temperature of the ground state, we conclude that the rotational temperature of the O2 (b1 Sigma g+) state is identical to the gas temperature. |
| Databáze: | OpenAIRE |
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