title: CONTRA: improving the performance of dynamic investigations in natural abundance organic solids by mirror-symmetric constant-time CODEX.
abstract: We present a minor but essential modification to the CODEX 1D-MAS exchange experiment. The new CONTRA method, which requires minor changes of the original sequence only, has advantages over the previously introduced S-CODEX, since it is less sensitive to artefacts caused by finite pulse lengths. The performance of this variant, including the finite pulse effect, was confirmed by SIMPSON calculations and demonstrated on a number of dynamic systems.
authors.affiliation: Institute of Physics, University of Halle, Friedemann-Bach-Platz 6, 06108 Halle, Germany. detlef.reichert@physik.uni-halle.de
authors.forename: Detlef
authors.initials: D
authors.lastname: Reichert
authors.forename: Ovidiu
authors.initials: O
authors.lastname: Pascui
authors.forename: Tito J
authors.initials: TJ
authors.lastname: Bonagamba
authors.forename: Peter
authors.initials: P
authors.lastname: Belton
authors.forename: Asher
authors.initials: A
authors.lastname: Schmidt
authors.forename: Eduardo Ribeiro
authors.initials: ER
authors.lastname: deAzevedo
mesh_terms: D000465:Algorithms; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D009930:Organic Chemicals / Q000032:analysis* / Q000737:chemistry*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted
chemical_list: D009930:Organic Chemicals