This book sheds new light on the dynamical behaviour of electron
spins in molecules containing two unpaired electrons (i.e. a
radical pair). The quantum dynamics of these spins are made
complicated by the interaction between the electrons and the many
nuclear spins of the molecule; they are intractable using
analytical techniques, and a naive numerical diagonalization is not
remotely possible using current computational resources. Hence,
this book presents a new method for obtaining the exact
quantum-mechanical dynamics of radical pairs with a modest number
of nuclear spins. Readers will learn how a calculation that would
take 13 years using conventional wavepacket propagation can now be
done in 1 day, and will also discover a new semiclassical method
for approximating the dynamics in the presence of many nuclear
spins. The new methods covered in this book are shown to provide
significant insights into three topical and diverse areas: charge
recombination in molecular wires (which can be used in artificially
mimicking photosynthesis), magnetoelectroluminescence in organic
light-emitting diodes, and avian magnetoreception (how birds sense
the Earth's magnetic field in order to navigate).
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