This work is a part of our systematic investigation of the very weak absorption spectra of 16O3 and 18O3 by high sensitivity Cavity Ring Down Spectroscopy between 5850 and 7920 cm-1. In total, 29 vibrational bands of 16O3 and 24 bands of 18O3 have been assigned in this range. Here we present the recent results of analyses of highly excited states of 18O3 ozone, located near the dissociation energy (D0~8560 cm-1). The comparison of the vibrational band centers obtained from the analysis with the predictions based on the potential energy surface (PES) suggests that the hypothesis of the “reef structure” at the ozone transition state towards the dissociation is not confirmed by spectroscopic observations. In this work, we focus on the comparison between theoretical and experimental values of the 18O3 vibrational levels near the dissociation limit.
This study is the continuation of our analysis of emission spectra of pure D20. The spectra have been recorded in the 320 - 860 and 1750 - 4300 cm-1 spectral regions at different pressures and temperatures. The measurements were performed
in an alumina cell with an effective length of hot gas of about 50 cm. All spectra have been recorded by using the Bruker
IFS 120 spectrometer at the Physikalisch-Chemisches-Institut, Justus-Liebig-Universitat Giessen (Germany). More than
5600 lines have been assigned to the second triad {(030), (110), (011)} of interacting states of the D2160 molecule. These
transitions were assigned to 24 vibration-rotation and rotational bands. An extended set of more than 1500 experimental
rovibrational levels for the (030), (110), and (011) interacting states has been obtained. The maximum values of
rotational quantum numbers are Jmax = 30 and Ka max = 21 with Emax = 10568 cm-1 for the (011) state; Jmax = 29 and
Ka max = 21 with Emax= 10540 cm-1 for the (030) state, and Jm 26 and Ka max 22 with Eniax 10488 cm1 for the (110)
state. A comparison of the observed energy levels with the best available values from literature and with the global
prediction is discussed.
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