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SUMMARY:Spin dynamics in radical pairs - Professor David Manolopoulos\, Un
 iversity of Oxford
DTSTART:20230301T143000Z
DTEND:20230301T153000Z
UID:TALK193645@talks.cam.ac.uk
CONTACT:Lisa Masters
DESCRIPTION:Radical (and polaron) pair recombination reactions play a role
  a wide variety of problems\, ranging from why the electroluminescence of 
 organic light emitting diodes changes in the presence of an applied magnet
 ic field to how migratory songbirds detect the direction of the Earth's ma
 gnetic field. The quantum mechanical Hamiltonian of a radical pair is stra
 ightforward to write down\, but the resulting Schrödinger equation is ext
 remely difficult to solve exactly for a radical pair containing a realisti
 c number of hyperfine-coupled nuclear spins. We have developed both semicl
 assical and quantum mechanical methods to overcome this difficulty\, deriv
 ed the quantum master equations that account for radical pair recombinatio
 n and electron spin relaxation processes\, and performed a variety of benc
 hmark radical pair spin dynamics calculations\, including a recent exact q
 uantum mechanical calculation of the spin dynamics of a carotenoid-porphyr
 in-fullerene complex that the Hore and Timmel groups have shown to provide
  a "proof of principle" for the operation of a chemical compass. This talk
  will review some of the highlights of our work in this area\, starting wi
 th the problem that first motivated us to work on radical pairs and ending
  with a demonstration that the problem has now been solved.
LOCATION:Unilever Lecture Theatre\, Yusuf Hamied Department of Chemistry
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