The geometry of reaction dynamics

T Uzer, C Jaffé, J Palacián, P Yanguas, SR Wiggins

Research output: Contribution to journalArticle (Academic Journal)peer-review

219 Citations (Scopus)

Abstract

The geometrical structures which regulate transformations in dynamical systems with three or more degrees of freedom (DOFs) form the subject of this paper. Our treatment focuses on the (2n - 3)-dimensional normally hyperbolic invariant manifold (NHIM) in nDOF systems associated with a centre x...x centre x saddle in the phase space flow in the (2n - I)dimensional energy surface. The NHIM bounds a (2n - 2)-dimensional surface, called a 'transition state' (TS) in chemical reaction dynamics, which partitions the energy surface into volumes characterized as 'before' and 'after' the transformation. This surface is the long-sought momentum-dependent TS beyond two DOFs. The (2n - 2)-dimensional stable and unstable manifolds associated with the (2n - 3)-dimensional NHIM are impenetrable barriers with the topology of multidimensional spherical cylinders. The phase flow interior to these spherical cylinders passes through the TS as the system undergoes its transformation. The phase flow exterior to these spherical cylinders is directed away from the TS and, consequently, will never undergo the transition. The explicit forms of these phase space barriers can be evaluated using normal form theory. Our treatment has the advantage of supplying a practical algorithm, and we demonstrate its use on a strongly coupled nonlinear Hamiltonian, the hydrogen atom in crossed electric and magnetic fields.
Translated title of the contributionThe geometry of reaction dynamics
Original languageEnglish
Pages (from-to)957 - 992
Number of pages36
JournalNonlinearity
Volume15 (4)
DOIs
Publication statusPublished - Jul 2002

Bibliographical note

Publisher: IOP Publishing Ltd
Other identifier: IDS number 578NE

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