Construction of potential energy curves in avoided crossing situations
β Scribed by K.D. Jordan
- Publisher
- Elsevier Science
- Year
- 1975
- Tongue
- English
- Weight
- 467 KB
- Volume
- 9
- Category
- Article
- ISSN
- 0301-0104
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π SIMILAR VOLUMES
In polyatomic molecules, the Wigner-van Neumann non-crossmg rule is generally relaxed because of the cxistcncc of more than a single nuclear coordinate. Potential energy surfaces may or may not intersect. There is an interesting class of states where an intersection cannot occur if only the dominant
This article points out a new aspect of approximate calculations of molecular potential curves\_ Two curves that cross in an exact solution of the ekctronic wave equation may avoid each other when an approsimate method is used. This is in direct contradiction to the usual interpretation of the van N
## Abstract A purely mathematical heuristic model is examined in order to explain the existence of an avoided crossing between two dispersion curves calculated for a certain potential energy surface designed to simulate the dynamics of a linear polyethylene chain. The model shows that a third mode