dc.creator Predoi-Cross, Adriana en_US dc.creator Berman, Richard en_US dc.creator Drummond, J. R. en_US dc.creator May, A. D. en_US dc.date.accessioned 2006-06-15T19:00:28Z dc.date.available 2006-06-15T19:00:28Z dc.date.issued 1998 en_US dc.identifier 1998-MF-12 en_US dc.identifier.uri http://hdl.handle.net/1811/18804 dc.description $^{a}$J.M. Hartmann et al., J. Phys. Chem. 94, 6406 (1991). en_US dc.description Author Institution: Department of Physics, University of Toronto en_US dc.description.abstract We have investigated the band collapse of $CO_{2}$ Q-branch spectra in the $4.8 \mu m$ spectral region. As pressure increases the individual line structure of the Q-branches collapses towards a single line of Lorentzian profile. This effect is due to line $mixing^{a}$. Our first experiments covered the 1 to 15 kPa pressure range at room temperature and 1 MHz resolution using a difference frequency laser system. The spectra were fitted successfully using the Rosenkranz first order theory of line mixing. Additional spectra, up to 70 kPa, were fitted including higher order line mixing effects. New spectra have been recorded at room temperature and $75^{\circ}C$ in the 1 to 30 atm pressure range using a Bomem FTIR instrument. In this pressure range line mixing effects are very strong; however, the bands are not fully collapsed. We have analysed these spectra using a simple Lorentzian model and a more complex line by line calculation. Our results highlight the rich effects of line mixing in these bands. en_US dc.format.extent 96776 bytes dc.format.mimetype image/jpeg dc.language.iso English en_US dc.publisher Ohio State University en_US dc.title LINE MIXING EFFECTS IN THE 2093 AND $2130 cm^{-1}$ PURE $CO_{2}$ Q-BRANCH SPECTRA en_US dc.type article en_US
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