Down, MJ;
(2014)
Assignment of trace atmospheric species.
Doctoral thesis , UCL (University College London).
Abstract
The spectroscopy of trace atmospheric species covered in this thesis is of wide and varied interest to the scientific community. The atmospheric applications of spectroscopic data include atmospheric modelling, remote sensing, and water vapour transport studies which are increasingly relevant to studies of our environmental impact as a species. Aside from the atmospheric applications, several of the molecules studied here are relevant in astronomical contexts, including ammonia, which was the first polyatomic molecule observed in the interstellar medium. In all these fields accurate rovibrational assignment of empirical molecular spectra is imperative, and where it is not available high quality variational line lists can provide vital information to take its place. This thesis sets out to improve the state of knowledge of spectroscopic parameters for the trace atmospheric species, 14NH3, HD16O, HD17O, HD18O, and HTO. The results comprise many new assignments and several new line lists which I hope to be of value to the wider scientific community. The ammonia assignments come as part of a complete re-analysis of the HITRAN ammonia data, in which we also recommend a new labelling scheme for ammonia in order to uniquely specify multiply-excited degenerate states. We also provide new composite line lists for several previously unobserved hot bands of ammonia. Significant HD18O and HTO assignments are obtained via analysis of two laboratory spectra due to Orphal et al. and Kobayashi et al. respectively. This work made use of new variational line lists for the HDO, D2O, HTO and T2O isotopologues of water which are also presented herein. For the three HDO isotopologues new line lists are used in combination with the highly accurate empirical energy levels of the IUPAC Task Group in order to provide high quality composite line lists. I believe that these line lists represent the best compilation of spectroscopic parameters available at present for these species.
| Type: | Thesis (Doctoral) |
|---|---|
| Title: | Assignment of trace atmospheric species |
| Language: | English |
| UCL classification: | UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1419269 |
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