Principle sketch of the experiment. The charge-separated radical pair (CSS-RP, black curve) decays in about 1000 nanoseconds by recombination of the electrons to singlet or triplet product. The dynamic change of the CSS radical pair between singlet (S) and triplet (T) is only recorded on average over the total reaction time. Using the push-pull technique, the singlet and triplet character of the CSS radical pair can be read out at any time. (Image: Christoph Lambert / Universität Würzburg)
12/23/2021
Researchers from Konstanz, Novosibirsk and Würzburg make it possible to read out optically indistinguishable spin states with a new spectroscopy method - published in "Science".
The change between singlet and triplet states of electron pairs in charge-separated states plays an important role in nature. Presumably, the compass of migratory birds can also be explained by the influence of the earth’s magnetic field on the magnetic interplay between these two spin states.
Until now, this quantum process could not be directly followed optically. ...
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