Evidences of spin-temperature in Dynamic Nuclear Polarization: an exact computation of the EPR spectrum
In dynamic nuclear polarization (DNP) experiments, the compound is driven out-of-equilibrium by microwave (MW) irradiation of the radical electron spins. Their stationary state has been recently probed via electron double resonance (ELDOR) techniques showing, at low temperature, a broad depolarizati...
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| creator | Caracciolo, Filippo Filibian, Marta Carretta, Pietro Rosso, Alberto De Luca, Andrea |
| description | In dynamic nuclear polarization (DNP) experiments, the compound is driven out-of-equilibrium by microwave (MW) irradiation of the radical electron spins. Their stationary state has been recently probed via electron double resonance (ELDOR) techniques showing, at low temperature, a broad depolarization of the electron paramagnetic resonance (EPR) spectrum under microwave irradiation. In this theoretical manuscript, we develop a numerical method to compute exactly the EPR spectrum in presence of dipolar interactions. Our results reproduce the observed broad depolarisation and provide a microscopic justification for spectral diffusion mechanism. We show the validity of the spin-temperature approach for typical radical concentration used in dissolution DNP protocols. In particular once the interactions are properly taken into account, the spin-temperature is consistent with the non-monotonic behavior of the EPR spectrum with a wide minimum around the irradiated frequency. |
| doi_str_mv | 10.48550/arxiv.1603.08620 |
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Their stationary state has been recently probed via electron double resonance (ELDOR) techniques showing, at low temperature, a broad depolarization of the electron paramagnetic resonance (EPR) spectrum under microwave irradiation. In this theoretical manuscript, we develop a numerical method to compute exactly the EPR spectrum in presence of dipolar interactions. Our results reproduce the observed broad depolarisation and provide a microscopic justification for spectral diffusion mechanism. We show the validity of the spin-temperature approach for typical radical concentration used in dissolution DNP protocols. 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| subjects | Depolarization Electron paramagnetic resonance Electron spin Electrons Irradiation Numerical methods Physics - Statistical Mechanics Physics - Strongly Correlated Electrons Polarization Signal to noise ratio Spin dynamics |
| title | Evidences of spin-temperature in Dynamic Nuclear Polarization: an exact computation of the EPR spectrum |
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