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      https://www.ias.ac.in/article/fulltext/pram/006/06/0343-0348

    • Keywords

       

      Nuclear quadrupole resonance,209Bi; wide band coherence-control; electric field gradient; covalency effects; electric field-induced effects

    • Abstract

       

      Nuclear quadrupole resonance (NQR) of209Bi has been studied in Bi4 (GeO4)3 and Bi4 (SiO4)3 using a wide band coherence-controlled superregenerative oscillator-detector. All the four allowed (ΔMI=±1) transitions are observed. In both cases the electric field gradient (EFG) tensor is axially symmetric (η=0.0). The quadrupole coupling constante2qQ is measured to be 490.8±1 MHz and 470.4±1 MHz respectively. It is pointed out that the purely ionic model is inadequate to understand these results. With the available experimental accuracy and the strength of the applied electric field (∼ 6 KV/cm), no field-induced effects on the NQR spectrum could be observed in the case of Bi4 (SiO4)3.

    • Author Affiliations

       

      K V Gopalakrishnan1 L C Gupta1 R Vijayaraghavan1

      1. Tata Institute of Fundamental Research, Bombay - 400005
    • Dates

       
  • Pramana – Journal of Physics | News

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