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- W2058464099 abstract "The Dirac equation for a charged particle in a time-dependent electromagnetic field is reduced to the Pauli equation in the non-relativistic limit by making a time-dependent Foldy-Wouthuysen transformation in a completely gauge-invariant way. In a time-dependent field, the expectation value of the Hamiltonian is dependent on the gauge, and so it cannot be the energy. The energy is obtained by taking the expectation value of the energy operator, the time rate of change of which is the average of the quantum mechanical power operator. The Hamiltonian formulation of a charged particle in a time-dependent external electromagnetic field is satisfactory when this distinction between the Hamiltonian, which describes the time evolution of the system, and the energy operator, which is gauge invariant, is made." @default.
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- W2058464099 date "1980-10-01" @default.
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- W2058464099 title "Gauge-invariant non-relativistic limit of an electron in a time-dependent electromagnetic field" @default.
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- W2058464099 doi "https://doi.org/10.1088/0305-4470/13/10/014" @default.
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