Abstract
We simulate nuclear and electron spin relaxation rates in a paramagnetic system from first principles. Sampling a molecular dynamics trajectory with quantum-chemical calculations produces a time series of the instantaneous parameters of the relevant spin Hamiltonian. The Hamiltonians are, in turn, used to numerically solve the Liouville–von Neumann equation for the time evolution of the spin density matrix. We demonstrate the approach by studying the aqueous solution of the ion. Taking advantage of Kubo's theory, the spin-lattice and spin-spin relaxation rates are extracted from the simulations of the time dependence of the longitudinal and transverse magnetization, respectively. Good agreement with the available experimental data is obtained by the method.
- Received 6 July 2016
DOI:https://doi.org/10.1103/PhysRevA.94.043413
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