Publisher’s Note: “Towards uniform enhancement in solid-state cross polarization magic angle spinning NMR: A scheme incorporating cross polarization with rotational resonance” [J. Chem. Phys. 124, 234512 (2006)]

Structure and Dynamics of Drawn Gel‐Spun Ultrahigh‐Molecular‐Weight Polyethylene Fibers by 1H, 13C and 129Xe NMR

“…We introduce here an improved version of QUCPMAS pulse sequence Figure 1b similar with that described in ref. [35,36] The novel features are: (i) a saturation pulse is implemented on the 13 C channel for avoiding the prepolarization distortion; (ii) the distorted 13 C longitudinal magnetization produced by CPMAS process is equilibrated by the magnetization exchange induced by the PARIS pulse sequence. [37,38] This pulse sequence is applied on the 1 H channel and works at low rf power and off-rotary resonance conditions.…”

Quantitative Measurement of Polymer Compositions by NMR Spectroscopy:Targeting Polymers with Marked Difference in Phase Mobility

“…For some other samples, it may occur partially due to the residual dipolar couplings. In this case the polarized 13 C signal will have the same phase as the spin-locked one with the Figure 2, leading to an enhanced rather than destructive magnetization.…”

“…It will affect the accuracy of the method. In this case, t = 0 can be used for obtaining only the PI spectrum, which avoids the problem and 13 C T 1F effect. In addition, the spectrum is much simpler because no peaks from the rigid component are present.…”

“…13 C NMR spectrum of a copolymer of polystyrene and polyisoprene obtained with a single pulse sequence (bottom) and a Hartmann-Hahn CP sequence (top) (contact time t = 50 μs). In CP spectrum, all the peaks from the PI component are missing due to fast molecular motion.…”

Quantitative analysis of a labeled 13C system in NMR

“…To alleviate these problems, many approaches had been proposed. They utilized the effects of variable contact times [9], Lee-Goldberg spin locking [10], cross depolarization [3,[11][12][13], and dipolar recouping (termed QUCP) [14][15][16][17]. These methods worked well on their proposed systems.…”