- 作者: Jian-Min Yuana, Yiwu Duanb and Wing-Ki Liuc
- 中文摘要:
aDepartment of Physics, Drexel University, Philadelphia, PA 19104, U.S.A.
bHunan Institute of Information Technology, Wangcheng, Changsha, Hunan 410200 , and Department of Physics, Hunan Normal University, Changsha, Hunan, 410081, P. R. China
cDepartment of Physics and the Guelph-Waterloo Physics Institute, University of Waterloo, Waterloo, Ontario, N2L 3G1, Canada
Just as a helium atom is a prototype for atoms, a hydrogen molecular ion is a prototype for chemical bonding in molecules. In the presence of an external field, the latter also serves as a prototype for which field-induced ionization and dissociation compete with each other. Pauli was the first to examine the nature of chemical bonding in terms of the old quantum theory. In view of the recent developments of nonlinear dynamics and quantum chaos, we re-examine the negative conclusion that he reached in his thesis. In particular, we are interested in finding out whether the classical three-body system is stable and whether any part of the chemical bonding can be attributed to its classical stability. Our result shows that indeed classical phase space structures exist which contribute to chemical bonding, when quantized semiclassically. Thus chemical bonding is not a purely quantum phenomenon, as generally believed.
We also examine the classical dynamical behavior of this three-body system in the presence of an external field beyond the Born-Oppenheimer approximation. Interesting competition exists between ionization, dissociation, and Coulomb explosion. Although ionization dominates over dissociation at high laser fields, there exists a range of laser intensity below 150 TW/cm2 for which we can concentrate on dissociation alone without significant interference from the ionization process. - 英文摘要: --
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