Influence of mass and potential energy surface geometry on roaming in Chesnavich's CH 4 + model
Chesnavich's model Hamiltonian for the reaction + H is known to exhibit a range of interesting dynamical phenomena including roaming. The model system consists of two parts: a rigid, symmetric top representing the ion and a free H atom. We study roaming in this model with focus on the evolution...
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| Published in | The Journal of chemical physics Vol. 149; no. 9; p. 094109 |
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| Main Authors | , |
| Format | Journal Article |
| Language | English |
| Published |
United States
07.09.2018
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| Online Access | Get more information |
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| Summary: | Chesnavich's model Hamiltonian for the reaction
+ H is known to exhibit a range of interesting dynamical phenomena including roaming. The model system consists of two parts: a rigid, symmetric top representing the
ion and a free H atom. We study roaming in this model with focus on the evolution of geometrical features of the invariant manifolds in phase space that govern roaming under variations of the mass of the free atom
and a parameter
that couples radial and angular motion. In addition, we establish an upper bound on the prominence of roaming in Chesnavich's model. The bound highlights the intricacy of roaming as a type of dynamics on the verge between isomerisation and nonreactivity as it relies on generous access to the potential wells to allow reactions as well as a prominent area of high potential that aids sufficient transfer of energy between the degrees of freedom to prevent isomerisation. |
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| ISSN: | 1089-7690 |