Computer-controlled pulsed electron-paramagnetic-resonance spectrometer

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Abstract
A computer-controlled electron-paramagnetic-resonance spectrometer for pulse and cw experiments is described. Particular features include: (i) a TWT microwave amplifier for high-power pump operation; (ii) a low-noise microwave amplifier for signal-to-noise improvement; (iii) the use of SPDT microwave switches, to allow independent setting of pump and observer power; (iv) computer control of data acquisition; (v) extensive data processing and graphics display system based on a PDP 11/23 computer. Detailed schematics and program software are available from the authors upon request.