• K N Shrivastava

      Articles written in Pramana – Journal of Physics

    • Quantum mechanical calculation of Suryan’s line broadening in nuclear magnetic resonance

      K N Shrivastava

      More Details Abstract Fulltext PDF

      The first quantum theory of the classical radiation damping in nuclear magnetic resonance is presented. Relaxation times and life times arising from the interaction of nuclear spin with the radio-frequency radiation field are calculated. Second-order line shifts are predicted and the existence ofIz andIz2-type operators due to photons is pointed out. The predicted line shifts as well as relaxation are found to be measurably large. Numerical estimates are given for protons in water.

    • Bose-Einstein condensation in spin-polarized atomic hydrogen: A new superfluid

      K N Shrivastava

      More Details Abstract Fulltext PDF

      We find that in the spin-polarized hydrogen, Bose condensation occurs for certain quantized values of the magnetic field. Once the field is fixed, sweeping of the radio-frequency results in nuclear magnetic resonance so that condensation and NMR occur simultaneously. We have found that nuclear self-induced transparency occurs. A new excitation designated by the present author as superboojum, which is a discontinuity in the hydrodynamic equations in spin-polarized hydrogen having finite nuclear as well as electronic spin is discovered.

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