The infra-red emission spectra of the oxy-hydrogen and oxy-deuterium flames and of hot water vapor have been studied in the LiF, NaCl, and KBr regions. The principal features of the spectrum may be accounted for by emission of H<sub>2</sub>O molecules; no unequivocal evidence for radiation from OH radicals was found with the resolving power available.
S. SILVERMAN and R. C. HERMAN, "The Infra-Red Emission Spectra of the Oxy-Hydrogen and Oxy-Deuterium Flames," J. Opt. Soc. Am. 39, 216-218 (1949)