Predissociation and spectroscopy of the ³A₂(0 0 0) state of ¹⁸O₃ from CRDS spectra of the ³A₂(0 0 0)鈫怷¹A₁(1 1 0) hot band near 7900

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• 作者：Didier Mondelain^a ; ^{didier.mondelain@ujf-grenoble.fr} ; Ré ; my Jost^a ; Samir Kassi^a ; Richard H. Judge^b ; Vladimir Tyuterev^c ; Alain Campargue^a
• 关键词：Ozone ; O3 ; Line width ; Predissociation ; Absorption spectroscopy ; CRDS ; Isotopologue
• 刊名：Journal of Quantitative Spectroscopy and Radiative Transfer
• 出版年：2012
• 期刊代码：70_00224073
• 类别：ch
• 出版时间：July, 2012
• 卷：113
• 期：11
• 页码：840-849
• 文件大小：603 K

摘要

The spectroscopy and predissociation of the ³A₂(0 0 0) state of ¹⁸O₃ are investigated from the analysis of the absorption spectrum of the ³A₂(0 0 0)鈫?hot band recorded by high sensitivity cw-CRDS between 7600 and 7920 cm^鈭?. The noise equivalent absorption of the recordings is on the order of 1脳10^鈭?0 cm^鈭?. Forty transitions could be rotationally assigned and their line positions were used to derive approximate spectroscopic parameters of the ³A₂(0 0 0) upper state. Most of the transitions exhibit a clear broadening due to the predissociation of the ³A₂(0 0 0) upper state at 9573.61 cm^鈭?. The width of the Lorentzian component (from 0.02 up to more than 0.5 cm^鈭?) was retrieved for some of the assigned transitions. The variation of the corresponding predissociation rates is due to the dependence of the spin-orbit coupling between the ³A₂(0 0 0) level and high lying dissociative vibrational levels of the electronic ground state, with (i) the J and K_a rotational quantum numbers and (ii) the energy gap between the coupled pair of rotational levels. From the predicted energies of the vibrational states and their vibrational overlap with the ³A₂(0 0 0) state, a few of these vibrational levels are identified as possibly responsible for the ³A₂(0 0 0) predissociation. The predissociative mechanism in ¹⁸O₃ is compared to that taking place in ¹⁶O₃.