title: EASY: a simple tool for simultaneously removing background, deadtime and acoustic ringing in quantitative NMR spectroscopy--part I: basic principle and applications.
abstract: Elimination of Artifacts in NMR SpectroscopY (EASY) is a simple but very effective tool to remove simultaneously any real NMR probe background signal, any spectral distortions due to deadtime ringdown effects and -specifically- severe acoustic ringing artifacts in NMR spectra of low-gamma nuclei. EASY enables and maintains quantitative NMR (qNMR) as only a single pulse (preferably 90°) is used for data acquisition. After the acquisition of the first scan (it contains the wanted NMR signal and the background/deadtime/ringing artifacts) the same experiment is repeated immediately afterwards before the T1 waiting delay. This second scan contains only the background/deadtime/ringing parts. Hence, the simple difference of both yields clean NMR line shapes free of artefacts. In this Part I various examples for complete (1)H, (11)B, (13)C, (19)F probe background removal due to construction parts of the NMR probes are presented. Furthermore, (25)Mg EASY of Mg(OH)2 is presented and this example shows how extremely strong acoustic ringing can be suppressed (more than a factor of 200) such that phase and baseline correction for spectra acquired with a single pulse is no longer a problem. EASY is also a step towards deadtime-free data acquisition as these effects are also canceled completely. EASY can be combined with any other NMR experiment, including 2D NMR, if baseline distortions are a big problem.
authors.affiliation: BAM Federal Institute for Materials Research and Testing, Division 1, Richard Willstaetter Str. 11, D-12489 Berlin, Germany. Electronic address: christian.jaeger@bam.de.
authors.forename: Christian
authors.initials: C
authors.lastname: Jaeger
authors.affiliation: BAM Federal Institute for Materials Research and Testing, Division 1, Richard Willstaetter Str. 11, D-12489 Berlin, Germany; Humboldt-Universität zu Berlin, Department of Chemistry, Brook-Taylor-Str. 2, D-12489 Berlin, Germany.
authors.forename: Felix
authors.initials: F
authors.lastname: Hemmann
keywords: (11)B; (13)C; (19)F; (25)Mg; Deadtime, (1)H; MAS; Probe background suppression; Ringing suppression; Solid State NMR