Line Positions and Intensities for the 2ν1 + ν2 + ν3 Band of 16O3

Abstract

The 2ν1 + ν2 + ν3 band of 16O3 has been recorded and analyzed for the first time at high resolution (0.006 cm−1) with a Fourier transform spectrometer. To increase the absorption strength of this very weak band a White-type cell with path lengths of up to 36 m and pressures from 45 to 55 Torr was used. This band, located at 3850 cm−1, lies in the region of the ν1 and ν3 H2O absorption bands. So, the whole experimental setup including the sections between the source, the detector, and the tank of the interferometer was put under vacuum in order to minimize the presence of water vapor lines. The 286 rotational levels of the (211) band (J up to 40, Ka up to 12) were satisfactorily reproduced with the aid of a single Watson-type Hamiltonian with a standard deviation of 1.8 × 10−3 cm−1. Line intensities were also measured for this band and were reproduced with suitable transition moment operators. Finally, a complete list of line positions, intensities, and lower state energies was generated for the 2ν1 + ν2 + ν3 band of 16O3.