• N D Sen Gupta

      Articles written in Pramana – Journal of Physics

    • The effect of rotating fields in magnetic resonance

      N D Sen Gupta

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      The phenomenon of magnetic resonance is studied by considering the transverse oscillatory field as superposition of two oppositely rotating fields. One of the rotating fields is taken as strong and the other relatively weak.

    • On the decaying states and the transition rates

      N D Sen Gupta

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      The object of this paper is to point out that the hypothesis of decaying states,i.e., states with amplitude having a factor eγt (γ-real) is not compatible with the wave equation with a hermitian hamiltonian. An attempt has been made to obtain the expression for relative population density in general. It is shown that the usual expressions for the transition rates, which are proportional to time, may be obtained for a very restricted interval of time.

    • On the non-radiating motion of a charged particle

      N D Sen Gupta

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      The most general class of the electric and magnetic fields such that a charged particle moving in this field will not radiate is obtained. Apart from suitably orientated constant fields, it includes some special varying (but steady) fields.

    • On the Dirac equation with anomalous magnetic moment term in a beam of electromagnetic wave

      N D Sen Gupta

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      The object of the paper is to obtain the solution of the Dirac equation with the Pauli-term in an electromagnetic field depending on the single variable (ct -nr) along the directionn.

    • On periodically kicked quantum systems

      N D Sen Gupta

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      The time evolution of a multi-dimensional system which is kicked periodically with a potential is obtained. The most interesting aspects of the investigation are (i) if the operator corresponding to the potential has invariant subspaces (a characteristic property of multi-dimensional systems), the states belonging to these subspace in its evolution are confined to these invariant subspaces respectively and there cannot be any mixing of states between these subspaces. Further, (ii) it leads to the existence of quasi-stationary states (determined again by the potential) which evolves independent of other similar quasi-stationary states. The method followed in the paper is the direct integration of the Schrödinger equation and then to construct the wave function from the initial wave function.

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