A 75 GHz spectrometer for microwave-induced optical nuclear polarisation

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Abstract
An apparatus has been developed for obtaining high nuclear polarisation by means of microwave-induced optical nuclear polarisation. In this recent variety of dynamic nuclear polarisation (DNP), the sample is doped with centres that are diamagnetic in the ground state, which can be excited to a paramagnetic state via irradiation with light. The nuclei are then polarised as in conventional DNP, using these excited states. The apparatus consists of an electron spin resonance spectrometer with optical detection operating at 75 GHz and at 1.4 K. It is further provided with nuclear magnetic resonance equipment necessary to measure the nuclear spin polarisation.