Abstract
A microwave two-pulse sequence with a weak and long 180° first pulse and a hard 90° second pulse is employed to detect nuclear coherences in pulsed EPR. The coherences created by the first pulse are transferred after an evolution periodTinto an observable FID by the second pulse. The free induction is measured at some fixed delay after the second pulse; it is modulated whenTis varied. As the second pulse may be switched on immediately after the first pulse, the nuclear coherences may be detected immediately as they start to freely oscillate, without loss of information within the instrumental dead time. The method is demonstrated for a sample of the radical cation of15N-labeled bacteriochlorophylla.
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