ROTATIONAL PERTURBATIONS IN THE SCHUMANN-RUNGE BANDS NEAR THE DISSOCIATION LIMIT
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Date
1997
Journal Title
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Volume Title
Publisher
Ohio State University
Abstract
Predissociation in the Schumann-Range bands of molecular oxygen plays an important role in the production of atmospheric $ozone^{h}$. However, the region of the Schumann-range bands near the dissociation limit $(\nu^{\prime} = 18 - 22)$ has only been partially analysed in the past. This has been due to the difficulties associated with obtaining accurate intensity and width measurements with spectrographic techniques, and the presence of ``main” and ``extra” lines associated with rotational perturbations. Our use of the non-linear optical technique of four-wave difference-frequency mixing (FWDFM) has enabled this region of the Schumann-Range bands (from 175-178nm) to be studied in unprecedented detail, with sub-Doppler resolution inabsorption. Recent measurements using FWDFM have enabled analysis of the $\nu^{\prime} = 16 - 18$ bands, with interpretation of the perturbations present in the region. The current investigation involves the study of those lines from $\nu^{\prime} = 19 - 22$. Preliminary analysis of the $\nu^{\prime} = 19$ band rotational lines confirms the presence of perturbations in the $F_{3}$ levels, possible caused by interactions with the $C^{\prime}\ ^{3}\Pi$ state. Results will be presented here on the recent findings in this region.
Description
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Author Institution: Research School of Physical Sciences and Engineering, The Australian National university
Author Institution: Research School of Physical Sciences and Engineering, The Australian National university