title: Fast REDOR with CPMG multiple-echo acquisition.
abstract: Rotational-Echo Double Resonance (REDOR) is a widely used experiment for distance measurements in solids. The conventional REDOR experiment measures the signal dephasing from hetero-nuclear recoupling under magic-angle spinning (MAS) in a point by point manner. A modified Carr-Purcell Meiboom-Gill (CPMG) multiple-echo scheme is introduced for fast REDOR measurement. REDOR curves are measured from the CPMG echo amplitude modulation under dipolar recoupling. The real time CPMG-REDOR experiment can speed up the measurement by an order of magnitude. The effects from hetero-nuclear recoupling, the Bloch-Siegert shift and echo truncation to the signal acquisition are discussed and demonstrated.
authors: Center of Interdisciplinary Magnetic Resonance, National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, FL 32310, USA.
authors: Ivan
authors: I
authors: Hung
authors: Center of Interdisciplinary Magnetic Resonance, National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, FL 32310, USA. Electronic address: gan@magnet.fsu.edu.
authors: Zhehong
authors: Z
authors: Gan
mesh_terms: D000409:Alanine / Q000737:chemistry; D000465:Algorithms; D017352:Echo-Planar Imaging / Q000379:methods*; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging / Q000379:methods*; D019906:Nuclear Magnetic Resonance, Biomolecular / Q000379:methods*; D012815:Signal Processing, Computer-Assisted
chemical_list: D000409:Alanine
keywords: Bloch–Siegert shift; CPMG; Dipolar coupling; Distance measurement; MAS; Magic-angle spinning; REDOR; Ultrafast