Analytic and Algebraic Dependence of Meromorphic Fns by A. Andreatti, W. Stoll

By A. Andreatti, W. Stoll

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Other presentations of 2D NMR spectra involve cross sections and projections along certain directions usually through the two axes o1, and o2 of the spectrum, although cross sections can be obtained as well at an angle of 451 with respect to the o1 axis. Both presentations are suitable for simplifying congested spectral regions, detecting hidden peaks, and performing quantitative analysis. Also, this type of spectral presentation saves time, since it speeds up the plotting duration. 3 Description of a Simple 2D NMR Experiment A rigorous analysis of a pulse sequence requires the use of either the density matrix formalism or the newly developed quantum mechanical theory of the product operators.

2 47 Calculated powder line shape of an isolated 31P nucleus for various values of the asymmetry parameter, Z. (Reprinted from ref. 14. ) Removal of Dipolar Coupling and CSA Both line-broadening factors are common for 12 nuclei. However, the full suppression of these two factors requires different techniques for homonuclear decoupling (1H–1H, 19F–19F) as compared to heteronuclear decoupling with protons (13C–1H, 31P–1H). 1 Heteronuclear Spins High-power proton decoupling and magic-angle spinning (MAS) can be used to eliminate the effects of dipolar coupling and CSA.

No proton decoupling can be applied because the sensitivity enhancement is induced by population differences in the 1H energy levels, which would be gone by decoupling. The use of non-selective pulses to manipulate the polarisation from protons to carbons avoids the limitations involved in the SPT and PSI experiments. This is accomplished by the pulse sequence called INEPT (Insensitive Nuclei Enhanced by Polarisation Transfer). 18. 18). The end result of this sequence is a spectrum with an anti-phase doublet.

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