Infrared Absorption Spectrum of Nitrous Oxide (NO) From 1830 cm to 2270 cm.

The frequencies of the vibration-rotation spectrum of NO have been measured from 1830 cm to 2270 cm. A number of weak bands have been measured and assigned to "hot bands'' and isotopic species in normal abundance. By using the Ritz principle and previously measured bands the bending frequency ( ) is calculated as 588.

Wavelength Calibrations in the Far Infrared (30 to 1000 Microns).

A discussion is presented of certain calibration procedures employed in the region 30 to 1000 microns. Calculated positions for the pure rotational absorption lines of the CO, HCN, and NO molecules are given, and a map of the pure rotational absorption lines of the HO molecule as recorded with a Perkin-Elmer model 301 spectrophotometer is shown.

Self-Broadening of Carbon Monoxide in the 2 and 3 Bands.

The self-broadening of carbon monoxide has been measured for the 2 and 3 bands with pressures up to 3.5 atmospheres. A grating spectrometer of high resolving power was used for the measurements and the correction for finite slits was small.

Infrared Spectrum of the + Band of CCH.

The infrared spectrum of the band of CCH has been analyzed and a value of = 0.64865 ±0.00005 cm determined.

Absorption Bands of Carbon Dioxide From 5.3 to 4.6 Microns.

Measurements have been made of the frequencies of the infrared absorption lines of CO in the region from 1850 cm to 2150 cm. Observations were made at various pressures and pathlengths up to a maximum of 72 meter-atmospheres. Vibration-rotation constants were obtained characterizing the transitions 11 0-000, 11 0-000, 03 0-000, 03 0-000, 200-01 0, I2 0-01 0, 12 0-01 0 for CO.

Broadening of the Rotational Lines of Carbon Monoxide by HCl and by Argon.

The present work deals with the broadening of rotational lines of the carbon monoxide 2-0 band by both argon and hydrogen chloride. A high resolution grating spectrometer with a spectral slit width of 0.07 cm was used, necessitating only a small correction in observed half-width values.

Analysis of Two Infrared Bands of CHD.

Two infrared absorption bands of CHD have been analyzed in the semirigid rotor approximation. These are the A-type band at 2671.67 cm and the C-type band at 4425.

Infrared Spectrum of Hydrobromic Aid.

A precise measurement of the infrared fundamental bands of HBr and HBr has been made. The two band centers have been found to be 2,558.94 and 2,558.

Infrared Absorption Spectrum of Methane From 2470 to 3200 cm.

The absorption spectrum of methane has been measured from 2470 to 3200 cm with a high-resolution infrared spectrometer. Pressures from 0.01 to 4.

Vibration-Rotation Structure in Absorption Bands for the Calibration of Spectrometers From 2 to 16 Microns.

Suitable bands of common gases have been tabulated and remeasured wherever necessary from 2 to 16 microns to obtain an accuracy of about 0.03 cm throughout the region and to provide good calibrating points at frequent intervals. Some 600 rotation-vibration lines are illustrated in 20 spectrograms and wavenumbers are listed in companion tables with considerable intercomparison with worthy data obtained in other laboratories.

Some Vibrational-Rotational Bands of Deuterated Methanes.

A parallel band at 2,200 cm and a perpendicular band at 2,780 cm of CHD have been observed under high resolution and analysed. The analysis of the perpendicular band revealed the presence of l-type doubling in the doubly degenerate excited state. From the analysis of the parallel band it is found that = 3.