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Electron paramagnetic resonance (EPR) or electron spin resonance (ESR) spectroscopy is a method for studying materials that have unpaired electrons. The basic concepts of EPR are analogous to those of nuclear magnetic resonance (NMR), but the spins excited are those of the electrons instead of the atomic nuclei .
Electron spin resonance dating was first introduced to the science community in 1975, when Japanese nuclear physicist Motoji Ikeya dated a speleothem in Akiyoshi Cave, Japan. [2] ESR dating measures the amount of unpaired electrons in crystalline structures that were previously exposed to natural radiation.
Already in his PhD thesis, he carried out the first electron spin resonance experiments on single electron spins. [2] The work was done in close collaboration with M. Orrit at the CNRS Bordeaux. To achieve the required sensitivity and selectivity, optical excitation of single molecules was combined with spin resonance techniques.
The first observation of electron-spin resonance was in 1944 by Y. K. Zavosky, a Soviet physicist then teaching at Kazan State University (now Kazan Federal University). ). Nuclear magnetic resonance was first observed in 1946 in the US by a team led by Felix Bloch at the same time as a separate team led by Edward Mills Purcell, the two of whom would later be the 1952 Nobel Laureates in Ph
Yevgeny Konstantinovich Zavoisky (Russian: Евгений Константинович Завойский; September 28, 1907 – October 9, 1976) was a Soviet physicist known for discovery of electron paramagnetic resonance in 1944.
The first observation of electron spin echo envelope modulation (ESEEM) was made in 1961 by Mims, Nassau and McGee. [3] Pulsed electron nuclear double resonance (ENDOR) was invented in 1965 by Mims. [4] In this experiment, pulsed NMR transitions are detected with pulsed EPR. ESEEM and pulsed ENDOR continue to be important for studying nuclear ...
He went on to study fleet antiaircraft operations, from Okinawa to London, where he met and wed Joan Hill in 1944. After the war he went to MIT as an assistant professor and first worked on their microwave linear accelerator, and later on electron spin resonance. Characteristically, in an interesting community of Gropius disciples, he built his ...
In physics, biology and chemistry, electron magnetic resonance (EMR) is an interdisciplinary field that covers both electron paramagnetic resonance (EPR, also known as electron spin resonance – ESR) and electron cyclotron resonance (ECR). [1]