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Title: Toward understanding the roaming mechanism in H + MgH → Mg + HH reaction

The roaming mechanism in the reaction H + MgH →Mg + HH is investigated by classical and quantum dynamics employing an accurate ab initio threedimensional ground electronic state potential energy surface. The reaction dynamics are explored by running trajectories initialized on a four-dimensional dividing surface anchored on three-dimensional normally hyperbolic invariant manifold associated with a family of unstable orbiting periodic orbits in the entrance channel of the reaction (H + MgH). By locating periodic orbits localized in the HMgH well or involving H orbiting around the MgH diatom, and following their continuation with the total energy, regions in phase space where reactive or nonreactive trajectories may be trapped are found. In this way roaming reaction pathways are deduced in phase space. Patterns similar to periodic orbits projected into configuration space are found for the quantum bound and resonance eigenstates. Roaming is attributed to the capture of the trajectories in the neighborhood of certain periodic orbits. As a result, the complex forming trajectories in the HMgH well can either return to the radical channel or “roam” to the MgHH minimum from where the molecule may react.
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [2] ;  [4] ;  [5] ;  [1] ;  [3]
  1. Univ. of Bristol, Bristol (United Kingdom)
  2. Univ. of Crete, Iraklion (Greece)
  3. Univ. of New Mexico, Albuquerque, NM (United States)
  4. Cornell Univ., Ithaca, NY (United States)
  5. Cardiff Univ., Cardiff (United Kingdom)
Publication Date:
Grant/Contract Number:
FG02-05ER15694; DF-FG02-05ER15694
Type:
Published Article
Journal Name:
Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory
Additional Journal Information:
Journal Volume: 120; Journal Issue: 27; Journal ID: ISSN 1089-5639
Publisher:
American Chemical Society
Research Org:
Univ. of New Mexico, Albuquerque, NM (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
OSTI Identifier:
1241435
Alternate Identifier(s):
OSTI ID: 1267205