ELECTRON-SPIN ECHO IMAGING USING A FIELD GRADIENT WIRE INSERTED INTO A CAVITY

Signal separation for composite signals of coal in an irradiated quart z tube was demonstrated using field-swept electron spin echo (ESE) ima ging. An uniform and intense magnetic field gradient was produced by s ixteen straight wires inserted into a microwave cavity. The distributi ons of spins in coal and an irradiated quartz tube were imaged indepen dently using a field-swept ESE with different spin-spin relaxation tim es, by selecting the time interval, tau, between the 90 degrees and 18 0 degrees pulses. The advantage of adopting the field gradient wires i nside the cavity for pulsed ESR imaging is discussed.