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 Title: Infrared spectroscopy of the H2/HD/D2-O2 van der waals complexes Author(s): Bunn, Hayley Contributor(s): Raston, Paul Subject(s): Synchrotron Abstract: Hydrogen is the most abundant element in the universe and oxygen is the third, so understanding the interaction between the two in their different forms is important to understanding astrochemical processes. The interaction between H$_{2}$ and O$_{2}$ has been explored in low energy scattering experiments\footnote{Y. Kalugina, et al., Phys. Chem. Chem. Phys. 14, 16458 (2012)}$^{,}$\footnote{S. Chefdeville et al. Science 341, 1094 (2013)} and by far infrared synchrotron spectroscopy of the van der Waals complex\footnote{H. Bunn et al. ApJ 799, 65 (2015)}. The far infrared spectra suggest a parallel stacked average structure with seven bound rotationally excited states. Here, we present the far infrared spectrum of HD/D$_{2}$-O$_{2}$ and the mid infrared spectrum of H$_{2}$-O$_{2}$ at 80 K, recorded at the infrared beamline facility of the Australian Synchrotron. We observed 'sharp' peaks in the mid infrared region, corresponding to the end over end rotation of H$_{2}$-O$_{2}$, that are comparatively noisier than analogous peaks in the far infrared where the synchrotron light is brightest. The larger reduced mass of HD and D$_{2}$ compared to H$_{2}$ is expected to result in more rotational bound states and narrower bands. The latest results in our ongoing efforts to explore this system will be presented. Issue Date: 2016-06-24 Publisher: International Symposium on Molecular Spectroscopy Genre: Conference Paper/Presentation Type: Text Language: En URI: http://hdl.handle.net/2142/91098 Rights Information: Copyright 2016 by the authors Date Available in IDEALS: 2016-08-22
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