THE EFFECT OF KINEMATIC FACTORS ON ROTATIONALLY AND ROVIBRATIONALLY INELASTIC SCATTERING OF GLYOXAL
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Date
2000
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Ohio State University
Abstract
State-to-state rotationally and rovibrationally inelastic scattering of $S_{1} 0^{\circ}, K^{\prime}= 0$ trans-glyoxal has been shown to be controlled by the kinematics of the collision. More details of this kinematic effect have been extracted from new glyoxal $+H_{2}$, $D_{2}$, He and Ne scattering experiments under well defined center-of-mass collision energies $(E_{c.m.})$ and momenta $(p_{c.m.})$. The experiment couples a laser pump-dispersed fluorescence probe approach with crossed molecular beams. The relative velocity $(\nu_{rel})$ of the collision pair was tuned by adjusting the beam intersection angle so a to select the desired $p_{c.m.}$ or $E_{c.m.}$. The distributions of relative rotational and rovibrational cross sections have an exponential dependance on the angular momentum change for all values of kinematic parameters. The slopes of these dependencies have a well-defined trend as a function of $p_{c.m.}$ regardless of the target gas identity. In contrast, analogous plots against $\nu_{rel}$ or $E_{c.m.}$ tend to be unique for each target gas. This behavior suggests that the momentum is the most convenient kinematic factor for discussing the cross section distributions.
Description
Author Institution: Department of Chemistry, Indiana University; Department of Geophysical Sciences, The University of Chicago