Perturbation expansion for bond orders and the commutator [H, S]
A perturbative expansion for Chirgwing and Coulson's and Löwdin's definitions of bond order is obtained, introducing explicitly the commutator [H, S]. Projection operator formalism is used in the development of the perturbation theory. Recurrence formulae are obtained for the corrections u...
| Autores principales: | , , |
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| Formato: | JOUR |
| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_00296341_v35_n2_p410_MacDowell |
| Aporte de: |
| Sumario: | A perturbative expansion for Chirgwing and Coulson's and Löwdin's definitions of bond order is obtained, introducing explicitly the commutator [H, S]. Projection operator formalism is used in the development of the perturbation theory. Recurrence formulae are obtained for the corrections up to any order. The relation between both definitions is given. © 1965 Società Italiana di Fisica. |
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