N D Sen Gupta
Articles written in Pramana – Journal of Physics
Volume 1 Issue 4 October 1973 pp 165-171 Spectroscopy
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.
Volume 3 Issue 6 December 1974 pp 363-369 Wave Mechanics
The object of this paper is to point out that the hypothesis of decaying states,
Volume 33 Issue 5 November 1989 pp 581-586 Electromagnetic Theory
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.
Volume 45 Issue 4 October 1995 pp 327-331
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 (
Volume 48 Issue 5 May 1997 pp 977-984
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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