Article (Scientific journals)
Wave packets in a bifurcating region of an energy landscape: Diels-Alder dimerization of cyclopentadiene
Lasorne, Benjamin; Dive, Georges; Desouter, Michèle
2005In Journal of Chemical Physics, 122 (18), p. 184304 1-10
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Abstract :
[en] Quantum dynamics in a valley ridge inflection (VRI) point region is analyzed in the case of the Diels-Alder endo-dimerization of cyclopentadiene pointed out recently by [Caramella , J. Am. Chem. Soc. 124, 1130 (2002)]. The VRI point is located along the reaction path connecting the bispericyclic symmetrical transition structure put in evidence by Caramella and the transition state of the Cope rearrangement. Dynamics is carried out by using constrained Hamiltonian methodology. The active coordinates are the first formed C-C bond length and the difference between the two other C-C bond lengths which achieve the dimerization as 4+2 or 2+4 adducts. A two-dimensional (2D) minimum-energy surface have been computed at the Becke 3 Lee-Yong-Parr/6-31G(*) level. The energy landscape can be classified as an uphill ridge-pitchfork VRI bifurcation according to a recent classification of bifurcation events [W. Quapp, J. Mol. Struct. 695-696, 95 (2004)]. Dynamics does not describe the thermal reaction but concerns wave packets which could be prepared by pulse reagents, i.e., by coherent control. We analyze how the shape and initial location on the ground potential-energy surface are linked to the synchronous or asynchronous mechanism of the final step after the first transition state. We use a one-dimensional model of optimum control theory to check the feasibility of such a coherent preparation. The wave-packet evolution in the VRI domain is well explained by semiclassical predictions even with the negative curvature of the unstable ridge. Finally, a crude model of dissipation has been introduced to test the stability of the 2D predictions. (c) 2005 American Institute of Physics.
Disciplines :
Chemistry
Physics
Author, co-author :
Lasorne, Benjamin
Dive, Georges ;  Université de Liège - ULiège > Centre d'ingénierie des protéines
Desouter, Michèle ;  Université de Liège - ULiège > Département de chimie (sciences) > Département de chimie (sciences)
Language :
English
Title :
Wave packets in a bifurcating region of an energy landscape: Diels-Alder dimerization of cyclopentadiene
Publication date :
08 May 2005
Journal title :
Journal of Chemical Physics
ISSN :
0021-9606
eISSN :
1089-7690
Publisher :
Amer Inst Physics, Melville, United States - New York
Volume :
122
Issue :
18
Pages :
184304 1-10
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 28 November 2009

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