Alexander Pines coauthored a method enhancing nuclear magnetic resonance signals from dilute nuclear spins in solids. Repeated transfer of polarization from abundant spins, usually protons, strengthens the rarer species' signal. Decoupling the abundant spins during observation then improves spectral resolution. The technique separates the problem of building a detectable spin polarization from the problem of measuring a narrow resonance, making otherwise weak solid-state spectra accessible.[ref]
Proton-enhanced NMR of dilute spins in solids by Alexander Pines and others. Journal of Chemical Physics 59, 569–590 (1973), abstract
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Portrait of Alexander Pines in 2007
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Alexander Pines is a prominent American chemist known for his contributions to the fields of nuclear magnetic resonance (NMR) and magnetic resonance imaging (MRI). He is a professor at the Stanford University Department of Chemistry and has made significant advancements in both fundamental and applied aspects of magnetic resonance technology. His work encompasses various applications, including the development of novel NMR techniques and their use in studying complex molecular systems. Pines is recognized for his influential research and has received numerous awards in recognition of his contributions to science.