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dc.creatorPredoi-Cross, Adrianaen_US
dc.creatorBerman, Richarden_US
dc.creatorDrummond, J. R.en_US
dc.creatorMay, A. D.en_US
dc.description$^{a}$J.M. Hartmann et al., J. Phys. Chem. 94, 6406 (1991).en_US
dc.descriptionAuthor Institution: Department of Physics, University of Torontoen_US
dc.description.abstractWe 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.extent96776 bytes
dc.publisherOhio State Universityen_US
dc.titleLINE MIXING EFFECTS IN THE 2093 AND $2130 cm^{-1}$ PURE $CO_{2}$ Q-BRANCH SPECTRAen_US

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