Konstantin Ivanov Intercontinental Magnetic Resonance Seminar

Konstantin Ivanov intercontinental magnetic resonance seminar series started on April 8, 2020. It organises seminars on a range of topics in magnetic resonance covering NMR, EPR, hyperpolarisation, colour centres and optical pumping, and ZULF NMR. The emphasis of the talks are on both methods and applications and a perspective on the future of the field. The speakers include a wide range of scientists ranging from PhD students to post-doctoral fellows, to senior scientists.

Upcoming Talks:

• June 5, ICONS 6th Anniversary Seminar, Gunnar Jeschke, ETH Zurich, Switzerland, "Prediction and partial suppression of electron spin decoherence", The precision of measurements on a spin system depends on the lifetime of coherences, and, for slow temporal changes in Hamiltonian parameters, on the lifetime of polarization. These lifetimes in turn are limited by relaxation, which arise from the time dependence of Hamiltonian parameters and of couplings to the environment. In solids, static couplings to spins in the environment can also cause loss of coherence on transitions inside the spin system. Such decoherence can be partially suppressed by dynamical decoupling. In this contribution, I address three mechanisms that cause electron spin decoherence by weak dipolar coupling to nuclear and electron spins in the environment. These are related to nuclear spin diffusion, methyl tunneling, and instantaneous diffusion, with the last term denoting the sudden change of the local field at an observer spin upon flipping like spins in the environment. I demonstrate that decoherence due to nuclear spin diffusion in Hahn echo decay is well approximated by the product of the analytical expressions for three-spin systems that involve the electron observer spin and only two nuclear spins. The same does not apply for decoherence under dynamical decoupling sequences. Similar observations are made for methyl-tunneling induced decoherence in the absence and presence of a spin-lock field. In analogy to homonuclear decoupling in solid-state NMR spectroscopy, dynamical decoupling can also be achieved for the electron-electron couplings that cause instantaneous diffusion. However, the optimal pulse schemes differ between NMR and EPR.

• June 12, 2026, Thomas Vosegaard, University of Aarhus, Denmark

• June 19, 2026, Alexander Schnegg, MPI CEC, Mülheim, Germany

• June 26, 2026, Raphaële Clément , UCSB, USA