Abstract
The absorption spectrum of ozone was recorded at low temperatures (down to −135 °C) by high resolution Fourier transform spectrometry and intra cavity laser absorption spectroscopy (ICLAS) near 10,400 cm −1. A preliminary analysis of the rotational structure of the absorption spectra of 16 O 3 and 18 O 3 shows that this spectral region corresponds to a superposition of two different electronic transitions, one with a very broad rotational structure, showing for the first time the asymmetric stretching frequency mode ν 3 of the electronic state 3 A 2 , the other formed by a completely diffuse band, probably the 2 0 1 band of a new transition due to the triplet electronic state 3 B 2 . Predissociation effects induce large broadening of the rotational lines for the transition centered at 10,473 cm −1 identified as the 3 0 2 band of the 3 A 2← X ̃ 1 A 1 electronic transition. The rotational structure cannot be analyzed directly but instead the band contour method was used to confirm the symmetry of the transition and to estimate the spectroscopic constants for the 16 O isotopomer. The origin of the band is at 10,473±3 cm −1 and the value of the 16 O 3( 3 A 2) antisymmetric stretching frequency mode is equal to 460±2 cm −1. We believe that the diffuse band is due to the 3 B 2 state and is located at about 10,363±3 cm −1 for 16 O 3 and 10,354±3 cm −1 for 18 O 3 . The isotopic rules confirm the different results obtained for 18 O 3 and 16 O 3 .
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