Naslov
Decoupling, Tuning, Matching and Cable Length Effects on NMR Noise Spectra

Autori
Müller, Norbert ; Schlagnitweit, Judith ; Horničáková, Michaela ; Nausner, Martin ; Jerschow, Alexej ; Bendet-Taicher, Eli ; Desvaux, Hervé ; Morgan, Steven W. ; Smrečki, Vilko

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
The Third Annual East-NMR User Meeting. Programme and Book of Abstracts / Vodiškar, Mateja ; Podbevšek, Peter ; Plavec, Janez ; Lenarčič Živković, Martina - Ljubljana : Slovenian NMR Cenre, National Institute of Chemistry, 2012, 76-76

ISBN
978-961-6104-21-0

Skup
The Third Annual East-NMR User Meeting

Mjesto i datum
Laško, Slovenija, 13.11.2012. - 16.11.2012

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Spin noise; NMR noise spectra

Sažetak
The complex tuning dependence of NMR noise spectra [1, 2] can be attributed largely to absorbed circuit noise (ACN), which exhibits a complex line shape, that depends on sample and probe properties. It is always superimposed by a purely absorptive spin noise contribution. Pure spin noise has been observed in wide line solid spectra [3] and in presence of static field gradients [4]. Previously, it was shown that a symmetrical dip line shape of a strong solvent noise signal can be used as a good indicator for tuning to optimum receiving conditions: the spin noise tuning optimum (SNTO) [2, 5]. We have investigated line shape changes of NMR noise signals upon systematic variation of the tuning and matching adjustments as well as cable lengths. It turns out that on most probes more than one SNTO-dip situation can be found. On many probes one finds that the conventional tuning optimum (CTO) and SNTO are far apart in tuning frequency. Reception sensitivity has been observed to be at a maximum at the SNTO. Using the systematic tuning-matching approach and varying cable lengths one can find conditions, where both pulse excitation and reception properties of a commercial NMR probe are at optimum values [6]. Under optimal conditions even recording of decoupled and coupled C-13 NMR noise spectra thus becomes feasible [7]. References: [1] Giraudeau P., Müller N., Jerschow A. and Frydman L., Chem. Phys. Lett., 489, 107-112 (2010) [2] Nausner M., Schlagnitweit J., Smrecki V., Yang X., Jerschow A. and Müller N., J. Magn. Reson., 198, 73-79 (2009) [3] Schlagnitweit J., Dumez J.-N., Nausner M., Jerschow A., Elena-Herrmann B. and Müller N., J. Magn. Reson., 207, 168-172 (2010) [4] Müller N. and Jerschow A., Proc. Natl. Acad. Sci. U.S.A., 103, 6790-6792 (2006) [5] Nausner M., Goger M., Bendet-Taicher E., Schlagnitweit J., Jerschow A. and Müller N., J. Biomol. NMR, 48, 157-167 (2010) [6] Bendet-Taicher E., Müller N. and Jerschow A., ArXiv, 2012arXiv:1209.5024B (2012) [7] Schlagnitweit J. and Müller N., J. Magn. Reson., 224, 78-81 (2012)

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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