Abstract

Spectral-emissivity measurements of the 15-μ band of CO2 were made in the temperature range from 1000° to 2300°K. The hot gas was produced in a supersonic burner, which used gaseous carbon monoxide and oxygen as propellants. Many “hot” transitions were observed which were identified through their Q-branches even when the spectral resolution of the spectrometer was not very high. The total intensity of the ν2-fundamental band system was determined at the highest temperatures and a value of 240 ± 15% cm−1/cm at STP was obtained in the present experiment which is in agreement with other measurements at room temperature. The maximum error resulting from the presence of the strong central Q-branch (at 670 cm−1) at a temperature of 2300°K was estimated, utilizing detailed line calculations for the fundamental transition and band-model calculations for the higher-order transitions.

© 1966 Optical Society of America

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