A paramagnetic material has the capacity for weak interactions with an external magnetic field due to the net magnetic moment of unpaired electron spin. In addition, a nucleus can have a net magnetic moment due to unpaired proton spin, a fact underpinning nuclear magnetic resonance spectroscopy. Nuclear magnetic resonance makes it possible to observe transitions between two spin states, which cause a net absorption of energy at a characteristic frequency of oscillating field that depends on the interaction of nucleus and its chemical environment.
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