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dc.creatorKabir, M. H.en_US
dc.creatorAntonov, I. O.en_US
dc.creatorMerritt, J. M.en_US
dc.creatorHeaven, M. C.en_US
dc.date.accessioned2009-07-29T12:35:41Z
dc.date.available2009-07-29T12:35:41Z
dc.date.issued2009en_US
dc.identifier2009-TI-07en_US
dc.identifier.urihttp://hdl.handle.net/1811/37969
dc.descriptionAuthor Institution: Department of Chemistry, Emory University, Atlanta; GA 30322en_US
dc.description.abstractOptically pumped HBr lasers are currently being investigated to evaluate their potential for high-energy laser applications. Vibrational cascade lasing from molecular HBr at wavelengths near 4-$\mu$m has been demonstrated when the 3-0 vibrational overtone was excited by a Nd:YAG laser (Kletecka et al. IEEE J. Quant. Electron. 40, 1471 (2004)). Lasing was observed on various rotational lines of the 3-2 and 2-1 bands. For computational modeling and optimization of the HBr laser, state-to-state rotational energy transfer rate constants are needed for HBr+HBr and HBr+He collisions. The present work is focused on the latter. Rotational energy transfer in HBr+He collisions was investigated using an ionization-detected pump-probe double resonance technique at ambient temperature. Rotational state selective excitation of $v=1$ for $J=0-8$ was achieved using a pulsed infrared OPO/OPA system, and the time evolution of HBr ($v=1$, $J$) was monitored using 2+1 resonantly enhanced multiphoton ionization (REMPI) spectroscopy via the \emph{g}$^3&$\Sigma$$^-$-\emph{X}$^1&$\Sigma$$^+$ (0-1) band. The experimental data was simulated by fitting to numerical solutions of a set of coupled differential equations describing the full relaxation processes. State-to-state rate constant matrices were generated using fitting and scaling laws. State-to-state rotational transfer rate constants were also calculated using a HBr+He potential energy surface (obtained using the CCSD(T) level of theory) and quantum scattering calculations. Comparisons of experimental and theoretical results will be presented.en_US
dc.language.isoEnglishen_US
dc.publisherOhio State Universityen_US
dc.titleEXPERIMENTAL AND THEORETICAL INVESTIGATIONS OF HBr+He ROTATIONAL ENERGY TRANSFERen_US
dc.typeArticleen_US


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