- 作者: 丘應楠
- 作者服務機構: Dept. of Chemistry, The Catholic Univ. of America, Washington, D. C., U.S.A.
- 中文摘要: The effect of higher-order photo-excitation on the angular distribution of photo-dissociated molecular fragments is studied. A general formalism is derived that will cover non-linear as well as linear polyatomic molecules and will permit comparison of the processes of different orders. Some of the higher-order processes, e.g., magnetic dipole and electric quadrupole, will give rise to azimuthal-angle (.PHI.) besides polar-angle (.THETA.) dependence of the fragments. Using a molecule of D/sub 3 h/ symmetry as an example, a comprehensive study is made of all possible excitations allowed by symmetry in this point group for one-photon electric/magnetic dipole and three-photon electric-dipole transitions. Plane wave approximation is used for the relative motion of the random and non-rotating molecules which dissociate instantaneously with a velocity large compared with thermal motion. These basic angular factors may be used in future extensions to rotating and vibrating molecules and to time-delayed dissociations and to vibronically excited fragment states, etc.
- 英文摘要: --
- 中文關鍵字: Photo-Excitation; Photo-Dissociation; Angular Distribution
- 英文關鍵字: 光激發;光分解;角度分佈