A spin probe is a type of molecular probe used in electron paramagnetic resonance (EPR) spectroscopy. EPR, also known as electron spin resonance (ESR), is a technique that detects unpaired electrons in a sample, making it useful for studying free radicals, metal ions, and other species with unpaired electrons. Spin probes typically consist of stable paramagnetic centers, such as nitroxide radicals, which have unpaired electrons.
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