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Coherence Transfer by Passage Pulses in Electron Paramagnetic Resonance Spectroscopy
Gunnar Jeschke1, Stephan Pribitzer1, Andrin Doll1
1ETH Zurich , Lab. Phys. Chem., Vladimir-Prelog-Weg 2, 8093 Zurich, Switzerland.
Linear passage pulses enable ultra-wideband electron paramagnetic resonance (EPR) spectroscopy. Their efficiency depends on adiabaticity, allowing for an effective flip angle, confirmed by experiments and useful for electron spin echo envelope modulation (ESEEM).
Area of Science:
- Physical Chemistry
- Spectroscopy
- Quantum Mechanics
Background:
- Electron Paramagnetic Resonance (EPR) spectroscopy is a powerful technique for studying materials with unpaired electrons.
- Ultra-wideband EPR requires efficient methods for manipulating electron spins over broad frequency ranges.
Purpose of the Study:
- To investigate the efficiency of linear passage pulses for ultra-wideband EPR.
- To define an effective flip angle for fast passage in EPR spectroscopy.
- To explore the generation and application of coherence on forbidden transitions.
Main Methods:
- Numerical simulations of passage pulse dynamics.
- Experimental validation using E' centers in Herasil glass.
- Analysis of relaxation and field inhomogeneity effects.
Main Results:
- Pulse efficiency follows an exponential law of critical adiabaticity for idealized pulses.
- Relaxation and field inhomogeneity cause deviations from the ideal exponential law.
- Coherence generation on forbidden transitions can be harnessed for Electron Spin Echo Envelope Modulation (ESEEM).
Conclusions:
- Linear passage pulses offer an efficient method for ultra-wideband EPR.
- The concept of an effective flip angle simplifies the description of fast passage.
- Passage pulses can be utilized for advanced EPR techniques like ESEEM.
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