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Chem. B 110, 14253-14261 (2006). M. Edén Quadrupolar coupling selective cross-polarization in solid state NMR, A simple new method is presented that yields quantitative solid-state magic-angle spinning (MAS) (13)C NMR spectra of organic materials with good signal-to-noise ratios. It achieves long (>10ms) cross polarization (CP) from (1)H without significant magnetization losses due to relaxation and with … 1980-08-01 2004-12-01 At 10 K, the signal maximum is reached with a 2 ms contact time, as compared to 90 K, when the signal maximum is not reached until 8-10 ms. The lines are provided to guide the eye. - "High-field cross polarization NMR from laser-polarized xenon to surface nuclei" The use of cross‐polarization (CP) NMR in conjunction with magic angle sample spinning (MASS) to examine the hydration reaction of tricalcium silicate (C 3 S) is described. In particular the very early stages of the reaction both with and without admixtures has been studied as well as the hydration in … We propose a new pulse sequence combining proton-nitrogen cross-polarization and carbonyl detection to record high-resolution, high-sensitivity NMR spectra of IDPs under physiological conditions.
Previously Lefebvre et. al. 6measured the intermolecular cross-polarization between the The Hartmann-Hahn matching profile in CP-MAS NMR shows a strong mismatch dependence if the MAS frequency is on the order of the dipolar couplings in the sample. Under these conditions, the profile breaks down into a series of narrow matching bands separated by the spinning speed, and it becomes difficult to establish and maintain an efficient matching condition. Variable-amplitude CP (VACP Solid-state NMR measurements of S = 1/2 metal nuclei, such as 113 Cd and 199 Hg, report directly on the nature and coordination geometry of the ligands in metal complexes.
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References 627 1. Introduction Cross-polarization (CP) from abundant spins I to dilute spins S is a double-resonance technique1 which overcomes two common problems in the NMR of solids. The first stems from the fact that solid-state We demonstrate the use of Lee-Goldburg cross-polarization (LG-CP) NMR under fast magic-angle spinning (MAS) to investigate the amplitude and geometry of segmental motions in biomolecular and polymeric solids.
A revised solid-state NMR method to assess the crystallinity of
17– Solid State NMR: Cross-Polarization In solid state NMR, cross-polarization (CP), i.e.
Cross polarization is a technique where magnetization is transferred from an abundant proton source to a dilute (isotopically of chemically) nucleus, X, during a "contact" period. During the contact time, rf fields for both 1H and X are turned on. The main objective of cross-polarization experiments is to increase the detection sensitivity.
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Therefore it may synonymously be called the “Hartmann/Hahn (HH) experiment.” NMR cross-polarization (CP) measurements are usually analyzed assuming that the cross-polarization time TIS of magnetization transfer from the abundant I spins to the rare S spins is shorter than the relaxation time T1ρ in the rotating frame of the I spins (fast CP regime).
Under these conditions, the profile breaks down into a series of narrow matching bands separated by the spinning speed, and it becomes difficult to establish and maintain an efficient matching condition.
Performative contradiction
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Principles of High Resolution NMR in Solids - M Mehring
applying a pulse simultaneously on an I and S spin, is a standard building block of most pulse sequences (see examples in Chapter 15). In this chapter, we will discuss how cross-polarization works.
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In this paper we discuss such NMR cross- polarization experimentsbetween abundant nuclei with spin I=—,.
Variable-amplitude CP (VACP Solid-state NMR measurements of S = 1/2 metal nuclei, such as 113 Cd and 199 Hg, report directly on the nature and coordination geometry of the ligands in metal complexes.