A reduced-dimensionality quantum model is proposed which incorporates the zero-point energy of the neglected modes in a systematic, natural way. In this model the reduced-dimensionality Hamiltonian is obtained by averaging the exact Hamiltonian over the dependence of the full-dimensional initial state of the neglected modes. The reduced Hamiltonian conserves all the terms of the full Hamiltonian, providing a more flexible description of the couplings between the modes considered explicitly in the model. The model is applied to simulate the vibrational predissociation dynamics of Cl-2-Ne-2, considering the three stretching modes of the complex. The results are compared to experimental data and to previous calculations using a reduced-dimensionality quantum model and a full-dimensional quantum-classical approach. The Cl-2-Ne-2 resonance lifetimes obtained agree only qualitatively with the experimental and previously calculated ones. By contrast, the present model predicts more correctly than previous calculations the behavior of the Cl-2 fragment vibrational distributions observed experimentally. The applicability of the model is discussed and further refinements are suggested.

A reduced-dimensionality quantum model which incorporates the full-dimensional energy of the system: Application to the vibrational predissociation of Cl-2-Ne-2 / M. Ceotto, A. García Vela. - In: THE JOURNAL OF CHEMICAL PHYSICS. - ISSN 0021-9606. - 115:5(2001 Aug 01), pp. 2146-2156.

A reduced-dimensionality quantum model which incorporates the full-dimensional energy of the system: Application to the vibrational predissociation of Cl-2-Ne-2

M. Ceotto
Primo
;
2001

Abstract

A reduced-dimensionality quantum model is proposed which incorporates the zero-point energy of the neglected modes in a systematic, natural way. In this model the reduced-dimensionality Hamiltonian is obtained by averaging the exact Hamiltonian over the dependence of the full-dimensional initial state of the neglected modes. The reduced Hamiltonian conserves all the terms of the full Hamiltonian, providing a more flexible description of the couplings between the modes considered explicitly in the model. The model is applied to simulate the vibrational predissociation dynamics of Cl-2-Ne-2, considering the three stretching modes of the complex. The results are compared to experimental data and to previous calculations using a reduced-dimensionality quantum model and a full-dimensional quantum-classical approach. The Cl-2-Ne-2 resonance lifetimes obtained agree only qualitatively with the experimental and previously calculated ones. By contrast, the present model predicts more correctly than previous calculations the behavior of the Cl-2 fragment vibrational distributions observed experimentally. The applicability of the model is discussed and further refinements are suggested.
Real-time dynamics; consistent-field approach; der-waals cluster; fragmentation dynamics; dissociation dynamics; vanderwaals clusters; picosecond fragmentation; photo-dissociation; wave-packet; spectroscopy
Settore CHIM/02 - Chimica Fisica
1-ago-2001
Article (author)
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/66976
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