Experimental investigation and modeling of the singlet-triplet rovibronic bands of ozone in the region of 11900-12800 cm-1
S.S. Vasilchenko1,2, A.A. Solodov1,2, O.V. Egorov1,2, V.G. Tyuterev1,2
1V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
2National Research Tomsk State University, Tomsk, Russia
Keywords: ozone, absorption spectrum, triplet electronic transition, Wulf band, tunable diode laser absorption spectroscopy
Abstract
A compact absorption spectrometer with a narrowband continuous tunable diode laser providing sensitivity in terms of the absorption coefficient on the order of 1 × 10-6 cm-1 is developed. The design of the spectrometer, the measurement technique, the scheme of ozone generation and maintenance are described. The spectrometer is used to record the absorption spectrum of the ozone molecule for a system of Wulf bands in the near infrared range 11900-12800 cm-1 corresponding to the rovibronic transitions from the ground to the excited triplet electronic states above the main dissociation threshold of the molecule. The magnitude of the predissociation broadening is estimated from the simulation of the absorption coefficient in the measured spectral range. Ozone absorption cross sections in the considered range are recommended for atmospheric applications; they have been obtained using statistically weighted averaging of the new measurements and experimental laboratory data published in the literature.
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