= Erwin Hahn
{c}
{tag=Physicist}
{title2=1921–2016}
{wiki}
= Erwin Louis Hahn
{c}
{synonym}
= Erwin L. Hahn
{c}
{synonym}
= E. L. Hahn
{c}
{synonym}
<Erwin Hahn> discovered <spin echo> signals, in which radiofrequency pulses restore an observable signal from nuclear <spins> that have apparently lost phase coherence. A spread of static <magnetic fields> makes different <spins> precess at different rates; suitable later pulses allow this reversible dephasing to refocus. The echo amplitude then probes relaxation and diffusion, rather than being determined solely by static field inhomogeneity. His 1950 analysis made pulsed <nuclear magnetic resonance> a method for distinguishing different causes of signal decay.<Spin Echoes by Erwin Louis Hahn>[Physical Review 80, 580–594 (1950), abstract and sections I–II]{ref}
A <physicist> who developed <spin echo> methods and studied <nuclear magnetic resonance> and <optics>.<Erwin L. Hahn by Dmitry Budker and Alexander Pines>[Professor of Physics, Emeritus; IBM research physicist and Berkeley physics faculty from 1955]{ref}
\Image[https://senate.universityofcalifornia.edu/_files/images/in-memoriam/erwin-hahn.jpg]
{title=Portrait of <Erwin Louis Hahn>}
{width=240}
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