Fred P. Dickey

The vibration-rotation band ν2 of HDO vapor

Abstract The vibration-rotation band ν 2 in the HDO vapor spectrum has been remeasured. An analysis of the rotational structure has been carried out. The band center and the values of the reciprocals of the moments of inertia have been determined. These are v 0 = 1403.42 cm −1 , A ( V ) = 25.551 cm −1 , B ( V ) = 9.238 cm −1 , and C ( V ) = 6.335 cm −1 . This band is a hybrid, and the ratio of intensities is approximately Intensity B : Intensity A = 2:1.

Near‐Infrared Emission Spectrum of NO

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 2Π32 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.

Emission Spectrum of the OH Radical in an Oxyacetylene Flame in the 1.5‐μ Region

The emission spectrum of the OH radical in the 1.5‐μ region has been observed in an oxyacetylene flame. In order to eliminate the strong background which results from H2O emission in the same flame a double‐beam method has been used. The double‐beam method, which uses two flame sources, has been described. The spectrum of the 2–0, 3–1, and 4–2 vibration‐rotation bands of OH which occur in this region are shown.

Vibration‐Rotation Band ν2 of Heavy Water Vapor

The vibration‐rotation band ν2 in the heavy water vapor (D2O) spectrum has been remeasured. An analysis of the rotational structure has been carried out. From the interpretation of the data the band center, as well as the value of the reciprocals of inertia have been determined. The band center is found to be 1178.45 cm—1 and the reciprocals of inertia are A (V) = 16.650 cm—1, B (V) = 7.345 cm—1, and C (V) = 4.795 cm—1.