TY - JOUR A1 - Jäger, Christian A1 - Hemmann, Felix T1 - EASY: A simple tool for simultaneously removing background, deadtime and acoustic ringing in quantitative NMR spectroscopy-Part I: Basic principle and applications JF - Solid state nuclear magnetic resonance N2 - 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 1H, 11B, 13C, 19F probe background removal due to construction parts of the NMR probes are presented. Furthermore, 25Mg 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. KW - Solid state NMR KW - MAS KW - Probe background suppression KW - Ringing suppression KW - Deadtime KW - 1H KW - 19F KW - 11B KW - 13C KW - 25Mg PY - 2014 DO - https://doi.org/10.1016/j.ssnmr.2013.11.002 SN - 0926-2040 SN - 1527-3326 VL - 57-58 SP - 22 EP - 28 PB - Academ. Press CY - Orlando, Fla. AN - OPUS4-29839 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Jäger, Christian A1 - Hemmann, Felix T1 - EASY: A simple tool for simultaneously removing background, deadtime and acoustic ringing in quantitative NMR spectroscopy. Part II: Improved ringing suppression, application to quadrupolar nuclei, cross polarisation and 2D NMR JF - Solid state nuclear magnetic resonance N2 - A simple experiment for Elimination of Artifacts in NMR SpectroscopY (EASY) was introduced in Part I, and it was shown that NMR probe background signals, spectral distortions due to deadtime effects, and acoustic ringing can be eliminated simultaneously from solid-state NMR spectra. In this Part II, it is shown that acoustic ringing suppression can be improved up to one order of magnitude compared to the original EASY pulse sequence by inserting a delay τ between the two data acquisition scans of the EASY pulse sequence. The achievable ringing suppression depends on the length of this delay and is limited by the spin-lattice relaxation time T1. Furthermore, EASY is considered in conjunction with NMR of quadrupolar nuclei. For strong second-order broadening, EASY can be used to acquire either pure central transition MAS patterns or pure satellite transition NMR spectra. Two further modifications to EASY are introduced. One concerns improved ringing artifact suppression in experiments in which the central transition NMR signal is amplified by Rotor Assisted Population Transfer (RAPT). The second EASY modification enables the acquisition of quantitative NMR spectra if signals with different quadrupole coupling constants are present. In addition, acoustic ringing and 11B stator signals are removed. Finally, it is demonstrated that the basic idea of EASY for removing ringing artifacts can be realized for heteronuclear one-dimensional and hetero- and homo-nuclear multi-dimensional NMR experiments using extended phase cycling. 15N{1H} CPMAS and 15N 2D Exchange NMR spectroscopy are considered as examples. KW - Solid State NMR KW - Probe background suppression KW - Ringing suppression KW - Deadtime KW - qNMR of quadrupolar nuclei KW - CPMAS NMR KW - 2D NMR KW - 11B KW - 23Na KW - 25Mg PY - 2014 DO - https://doi.org/10.1016/j.ssnmr.2014.08.001 SN - 0926-2040 SN - 1527-3326 VL - 63-64 SP - 13 EP - 19 PB - Academ. Press CY - Orlando, Fla. AN - OPUS4-32329 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -