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- Title
Distance measurement between trityl radicals by pulse dressed electron paramagnetic resonance with phase modulation.
- Authors
Wili, Nino; Hintz, Henrik; Vanas, Agathe; Godt, Adelheid; Jeschke, Gunnar
- Abstract
Distance measurement in the nanometre range is among the most important applications of pulse electron paramagnetic resonance today, especially in biological applications. The longest distance that can be measured by all presently used pulse sequences is determined by the phase memory time Tm of the observed spins. Here we show that one can measure the dipolar coupling during strong microwave irradiation by using an appropriate frequency- or phase-modulation scheme, i.e. by applying pulse sequences in the nutating frame. This decouples the electron spins from the surrounding nuclear spins and thus leads to significantly longer relaxation times of the microwave-dressed spins (i.e. the rotating frame relaxation times T1p and T2p) compared to Tm. The electron-electron dipolar coupling is not decoupled as long as both spins are excited, which can be implemented for trityl radicals at Q-band frequencies (35 GHz, 1.2 T). We show results for two bis-trityl rulers with interelectron distances of about 4.1 and 5.3 nm and discuss technical challenges and possible next steps.
- Subjects
PARAMAGNETIC resonance; PHASE modulation; IRRADIATION; NUCLEAR spin; ELECTRON paramagnetic resonance
- Publication
Magnetic Resonance, 2020, Vol 1, Issue 1, p75
- ISSN
2699-0016
- Publication type
Article
- DOI
10.5194/mr-1-75-2020