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In dynamic nuclear polarisation (DNP), also called hyperpolarisation, a small amount of unpaired electron spins is added to the sample containing the nuclear spins, and the polarisation of these unpaired electron spins is transferred to the nuclear spins by means of a microwave field. Traditional DNP polarises the electron spin of stable paramagnetic centres by cooling down to low temperature and applying a strong magnetic field. Then weak continuous wave microwave fields are used to induce the polarisation transfer. Complicated cryogenic equipment and strong magnets can be avoided using short-lived photo-excited triplet states that are strongly aligned in the optical excitation process. However, a much faster transfer of the electron spin polarisation is needed and pulsed DNP methods like nuclear orientation via electron spin locking (NOVEL) and the integrated solid effect (ISE) are used. To describe the polarisation transfer with the strong microwave fields in NOVEL and ISE, the usual perturbation methods cannot be used anymore. In the previous paper, we presented a theoretical approach to calculate the polarisation transfer in ISE. In the present paper, the theory is applied to the system naphthalene-h(8) doped with pentacene-d(14) yielding the photo-excited triplet states and compared with experimental results.
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Arnaud Comment, Tim Rolf Eichhorn, Martin Haag, Sami Jannin, Jacques Van Der Klink
Mathieu Baudin, David Baudouin, Pierrick Berruyer, Geoffrey Bodenhausen, Aurélien Bornet, Matthieu Cavaillès, David Lyndon Emsley, David Benjamin Roger Antoine Gajan, Sami Jannin, Basile Vuichoud
Geoffrey Bodenhausen, Arnaud Comment, Sami Jannin, Riddhiman Sarkar, Paul Romeo Vasos