Transient oscillations under strongly mismatched Hartmann-Hahn conditions.
Based on the standard 2D Polarization inversion experiment, a new pulse sequence (PI-TAPF) is proposed. It represents a combination of Polarization Inversion and TAPF (time averaged precession frequency) sequences. The depolarization period consists of phase-alternating intervals of different duration in the I channel. The pulse sequence yields transient oscillations under the strongly mismatched HH conditions where the required power for the dilute spins is reduced by a factor of 5. Experimental results recorded for a sample of ferrocene powder are well reproduced by numerical simulations.
D000465:Algorithms; D002247:Carbon Isotopes; D003198:Computer Simulation; D005296:Ferrous Compounds / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D000075163:Metallocenes; D008958:Models, Molecular; D012815:Signal Processing, Computer-Assisted
D002247:Carbon Isotopes; D005296:Ferrous Compounds; D000075163:Metallocenes; C004998:ferrocene