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Spectroscopic Studies of Low-Pressure Flames. III. Effective Rotational Temperatures and Excitation Mechanism for C2 Bands

A. G. Gaydon and H. G. Wolfhard
Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences
Vol. 201, No. 1067 (May 23, 1950), pp. 561-569
Published by: Royal Society
Stable URL: http://www.jstor.org/stable/98506
Page Count: 9
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Spectroscopic Studies of Low-Pressure Flames. III. Effective Rotational Temperatures and Excitation Mechanism for C2 Bands
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Abstract

Intensity measurements on the Swan bands of C2 give effective rotational temperatures for a number of flames. For oxygen/acetylene at 1 atm. the value is 4950 degrees K, falling to 3800 degrees K at 2 mm. For acetylene/air it is 3400 degrees K at 1 atm., falling a little at low pressure. In discussing the excitation process, reasons are given against its being a true chemiluminescence. It is believed that the C2 radicals are formed with high rotational energy and are electronically excited by collision with energy-rich molecules present in the flame and responsible for the high excitation temperatures previously recorded. These energy-rich molecules probably possess excess vibrational energy.

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