Spectroscopic Measurements of Radio Frequency Plasmas in Supercritical Fluids
- Graduate School of Science and Engineering, Ehime University, Matsuyama 790-8577 (Japan)
- Graduate School of Engineering, Kyoto University, Kyoto 606-8501 (Japan)
- Faculty of Agriculture, Ehime University, Matsuyama 790-8566 (Japan)
Spectroscopic measurements of radio frequency (rf) plasma were performed under high pressure CO{sub 2} conditions (5 and 7 MPa) and supercritical (sc)CO{sub 2} conditions (8-20 MPa). The temperatures evaluated from C{sub 2} Swan bands increased from 3600 K to 4600 K with increasing pressure. The broadening and shifting of the O I line profile ({approx}777 nm) of rf plasma was observed under scCO{sub 2} conditions. The width of the line profile increased with increasing pressure. The reason for the broadening and shifting is still unclear because the present theory used to explain them is not valid for such high pressure conditions. Further, the broadening of the Ar I line profile ({approx}811.5 nm) in rf plasmas was observed under atmospheric Ar (0.1 MPa), high pressure Ar conditions (1-4 MPa), and scAr condition (5 MPa); the observation of the O I line profile in CO{sub 2} plasmas is difficult in this pressure range owing to its weak intensity therein. Similar to the case of the O I line in CO{sub 2} plasmas, the reason for the broadening of the Ar I line profile at 5 MPa is unclear.
- OSTI ID:
- 21428686
- Journal Information:
- AIP Conference Proceedings, Vol. 1290, Issue 1; Conference: 20. international conference on spectral line shapes, St. John's (Canada), 6-11 Jun 2010; Other Information: DOI: 10.1063/1.3517580; (c) 2010 American Institute of Physics; ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
Similar Records
Gas temperature measurement in CF{sub 4}, SF{sub 6}, O{sub 2}, Cl{sub 2}, and HBr inductively coupled plasmas
Basalt Reactivity Variability with Reservoir Depth in Supercritical CO2 and Aqueous Phases