Absorption and Emission Measurements of C2 and CH Electronic Bands in Low-Pressure Oxyacetylene Flames
1965; American Institute of Physics; Volume: 43; Issue: 10 Linguagem: Inglês
10.1063/1.1696536
ISSN1520-9032
AutoresR. Bleekrode, W. C. Nieuwpoort,
Tópico(s)Combustion and flame dynamics
ResumoAbsorption and emission spectra pertaining to electronic transitions of the short-lived molecules C2 and CH as present in the reaction zone of low-pressure oxyacetylene flames are studied. Steady flame absorption in the 4315-Å band of CH (2Δ—2Π) is reported for the first time. The concentration of CH in the 2Π(v=0) state is estimated to be [CH]≈1012 cm−3. The absorption measurements of the 0–0 C2 Swan band (3Πg—3Πu) extend existing measurements in that the rotational structure of the P and R branches is now well resolved. The rotational intensity distributions in emission and absorption are compared and the concentration in the 3Πu state is derived: [C2]≈1013 cm−3. Furthermore it is concluded that the C2 exitatation is nonthermal. This conclusion is supported by the observation of an interesting nonequilibrium rotational intensity distribution in the C2 emission spectrum.
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