I. Kleiner

The ν4 fundamental bands of trans- and cis-HNO2

Abstract The spectra of trans - and cis -HNO 2 have been recorded at an apodized resolution of 1.86 × 10 −3 cm −1 in the region of 600 to 1000 cm −1 . Some 1950 lines of a -type are assigned to the ν 4 fundamental band of trans -HNO 2 and over 3100 lines of a - and of b -types to the ν 4 fundamental band of cis -HNO 2 . Relative intensity information is discussed.

Infrared laser Stark spectrum of HNO3 at 6 μm

Intracavity laser Stark experiments were performed on the ν2 fundamental band of nitric acid, HNO3, using a CO laser. Despite the high density of observed resonances in the spectra, it was possible to recognize and fit several transitions. Calculations were made using a theoretical approach describing the Stark effect in asymmetric-topped molecules in terms of tensorial elements. The main result of the analysis was the first reported determination of the a and b components of the electric-dipole moment in the ν2 = 1 vibrational level.