## Abstract The connections between open shell Brillouin–Wigner perturbation theory and the Van Vleck unitary transformation formalisms for generating effective Hamiltonians are explored. An explicit expression is obtained relating the generator __Ŝ__ of the unitary transformation __e__^__iŝ__^ wit
✦ LIBER ✦
On the Connection Between the Resolvent Methods and Partitioning Technique, Rational Approximations, and Perturbation Theory
✍ Scribed by Löwdin, Per-Olov
- Book ID
- 126278897
- Publisher
- Royal Swedish Academy of Sciences
- Year
- 1985
- Tongue
- English
- Weight
- 182 KB
- Volume
- 32
- Category
- Article
- ISSN
- 0031-8949
No coin nor oath required. For personal study only.
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## Abstract We continue to examine the connection between perturbation theory and the Van Vleck unitary transformation. Here we illustrate the formalism derived earlier by applying it to compute the stationary states of the perturbed harmonic oscillator. We find that each solution of the traditiona
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