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We describe instrumentation for a high-frequency electron paramagneticresonance (EPR) and pulsed electron-electron double resonance (PELDOR)spectroscopy. The instrumentation is operated in the frequency range of107$-$120 GHz and 215$-$240 GHz and in the magnetic field range of 0$-$12.1Tesla. The spectrometer consisting of a high-frequency high-power solid-statesource, a quasioptical system, a phase-sensitive detection system, acryogenic-free superconducting magnet and a $^4$He cryostat enablesmulti-frequency continuous-wave EPR spectroscopy as well as pulsed EPRmeasurements with a few hundred nanosecond pulses. Here we discuss the detailsof the design and the pulsed EPR sensitivity of the instrumentation. We alsopresent performance of the instrumentation in unique experiments includingPELDOR spectroscopy to probe correlations in an insulating electronic spinsystem and application of dynamical decoupling techniques to extend spincoherence of electron spins in an insulating solid-state system.

A high-frequency electron paramagnetic resonance spectrometer for multi-dimensional, -frequency and -phase pulsed measurements