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The emission spectrum of the vibration—rotation bands of the electronic ground state of nitric oxide has been observed in the 1.83–1.95- and 2.63–2.81-μ regions under moderately high resolution. The source of the spectrum was a high-tension discharge maintained through streaming nitric oxide gas at pressures of less than 1 atm. A detailed analysis of the 2–0, 3–;1, and 4–;2 bands, occurring at 2.69, 2.73, and 2.77 μ, respectively, has been carried out. Accurate values obtained for many of the rotational and vibrational constants associated with the 2II½ and Π322 substates of the electronic ground state are presented, including a value for the spin—orbit coupling constant A. Also, the effective rotational temperature of the emitting gas has been determined.

The infra-red spectrum of carbon monoxide has been investigated with a 7200 line-per-inch grating. The fundamental bands of C 12 0 16 and C 13 0 16 and the overtone of C 12 0 16 were measured. The rotational structure has been analyzed by means of combination relations, and the following new values of the molecular constants have been obtained: co e = 2169.60 cm -1 , to/ = 2121.33 cm" 1 , x e o>e=13.22 cm" 1 , (*«««)'= 12.64 cm" 1 , J5 a = 1.9238 cm" 1 , 3,' = 1.8465 cm" 1 , <* = 0.0175 cm" 1 , «'= 0.0169 cm" 1 , /«= 14.548 XlO" 40 g cm 2 , // = 15.157X10" 40 g cm 2 , r e (average for both molecules) = 1.1291 XlO" 8 cm. The primed constants refer to the isotopic molecule.

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The infrared spectrum of CO2 in the region of 2.7μ has been remeasured. Five rotation-vibration bands have been identified and analyzed in detail. One of these is due to C13O2. The rotational constants obtained were B000=0.3904 cm−1 and D000=0.25×10−6 cm−1.In two of the bands l-type doubling occurs, and the values of the splitting constants q were determined.