An X-band time domain electron paramagnetic resonance spectrometer
Ranjan Das Balu Venkataraman Vinod R Bhagat Ajit S Ghangrekar Thomas Kuruvilla B K Chaturvedi G S Isola B M Marwaha P G Nair R S Parolia B K Sarkar
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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.
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
Volume 96, 2022
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