Nuclear magnetic resonance was first described and measured in molecular beams by Isidor Rabi in 1938 , by extending the Stern -- Gerlach experiment , and in 1944 , Rabi was awarded the Nobel Prize in Physics for this work .
Nuclear magnetic resonance was first described and measured in molecular beams by Isidor Rabi in 1938 . In 1944 , Rabi was awarded the Nobel Prize in Physics for this work .