The external-field approximation in quan
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R. Samson; A. Ben-Reuven
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Article
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1975
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Elsevier Science
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English
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A canonical transformation is presented in which the effect of a coherent, classiul, cxlemally applied field (represcr!:ed by B GIauber coherent state) is transferred from the boundny conditions to the hamiltonian, resulring in the addition of an external, chssiul field to the hamiltonian, whtic sti