Time-dependent perturbation theory by gauge transformations
β Scribed by Jeremy I Musher
- Publisher
- Elsevier Science
- Year
- 1964
- Tongue
- English
- Weight
- 738 KB
- Volume
- 27
- Category
- Article
- ISSN
- 0003-4916
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π SIMILAR VOLUMES
The time-dependent gauge transformation is discussed in the context of modified Lagrangian and Hamiltonian formalisms in which time is treated as a dynamical coordinate. It is shown that Berry's phase is invariant under both time-dependent unitary and generalized gauge transformations. The Berry pha
The SCF perturbative method de&eloped for the calculation of static pohrizabilities is extended to the frequency-dependent case. Calcuhtions are reported for helium and methane. The helium results are compared \vith those of other x+orkers.
The selfconsistent field based theory of frequency-independent hyperpolarizabilities is adapted to the treatment of the corresponding frequency-dependent quantities. Explicit expressions are given ior the double and null frequency polarizations of a molecule in a long-estabiished oscilhrting electri