AI Article Synopsis
- The study investigates the radiative association of CN using both quantum dynamical and semiclassical methods, highlighting the influence of shape resonances.
- The researchers found that these resonances, which are due to states trapped by the centrifugal barrier, significantly impact the energy-resolved cross sections of the reactions.
- The results reveal that while the semiclassical approach is fairly accurate above room temperature (within 25%), the effects of shape resonances become more crucial for lower temperatures.
Article Abstract
Radiative association of CN is simulated using a quantum dynamical as well as a semiclassical approach. A comparison of the resulting energy-resolved cross sections reveals striking quantum effects that are due to shape resonances. These, in turn, arise because of states that are quasibound by the centrifugal barrier. The quantal rate coefficient for temperatures from 40 to 1900 K has been computed using the Breit-Wigner theory to account for the resonances. Comparison with the results obtained by Singh and Andreazza [Astrophys. J. 537, 261 (2000)] shows that the semiclassical method, which completely omits the shape resonances, is accurate to within 25% above room temperature. At lower temperatures the contribution from the shape resonances to the radiative association rate is more significant.
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| http://dx.doi.org/10.1063/1.3196179 | DOI Listing |
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