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    • Keywords

       

      Magnetic resonance; electron paramagnetic resonance; electron spin resonance; saturation recovery technique; electron spin-lattice relaxation; time domain EPR; pulsed EPR

    • Abstract

       

      A computer-controlled X-band time domain electron paramagnetic resonance (EPR) spectrometer, with a time resolution of the order of 0.5μsec, has been constructed with many of the crucial microwave components designed and fabricated by the Microwave Engineering Group of TIFR. The spectrometer operates either in a microwave power pulsed mode for determination of spin-lattice relaxation times by the saturation recovery technique or in the kinetic mode for determination of the time dependence of EPR signal after laser excitation. It has an automatic frequency control, an automatic phase control and, most importantly, a field-frequency lock which ensures good stability of the EPR line positions enabling signal averaging for extended periods. The constructional details of the spectrometer and its performance in both the modes are described here by reporting results on certain typical systems.

    • Author Affiliations

       

      Ranjan Das1 Balu Venkataraman1 Vinod R Bhagat1 Ajit S Ghangrekar1 Thomas Kuruvilla1 B K Chaturvedi1 2 G S Isola1 2 B M Marwaha1 2 P G Nair1 2 R S Parolia1 2 B K Sarkar1 2

      1. Chemical Physics Group, Tata Institute of Fundamental Research, Homi Bhabha Road, Bombay - 400 005, India
      2. Microwave Engineering Group, Tata Institute of Fundamental Research, Homi Bhabha Road, Bombay - 400 005, India
    • Dates

       
  • Pramana – Journal of Physics | News

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