2020年5月4日 · Knowing typical 13 C T 1 values is thus key to parameter optimization. 13 C T 1 measurements were taken on three molecules: S-carvone, cis-2-methoxycinnamic acid, and ( …

2018年12月1日 · In this paper, we present two improved methods for the measurement of 13 C NMR relaxation values in solids with fast local dynamics, such as hydrated elastin. The …

2017年1月9日 · 各个13C核的T1是不同的。 为了实现定量，必须使t时间足够长，保证各个13C核都恢复到1。一般来说，t等于3-5倍的T1(max)时，磁化恢复超过0.95，对各个核来说就可以定 …

A simple pulse sequence that combines a progressive saturation experiment with gate decoupling is proposed for measuring T1 and η values. The calculated η values are a good approximation …

The spectra can be processed by the automation program proc_t1 or manually entering xf2. In all cases, set SI1 as a power of two greater than or equal to the number of delays in vdlist ( …

1999年2月11日 · In this article, we verified the structure of PHEMA and PHEMA-IPN by 13 C CP/MAS NMR. Also, the 13 C spin-lattice relaxation times in the rotating frame, T 1ρ, were …

The mechanisms of spin—lattice relaxation of 13C are discussed in the light of T1 data for a number of small molecules. Contributions from dipolar interactions, spin—rotation, chemical …

T1 values of 13C nuclei are significantly longer than 1H ( at least twice as long). With the common pulse sequence parameter settings, 13C integration quantitation is difficult because the long …

2018年5月17日 · A robust and selective late-stage deuteration methodology was applied to 13C-enriched amino and alpha hydroxy acids to increase spin-lattice relaxation constant T1 for …

A robust and selective late-stage deuteration methodology was applied to 13 C-enriched amino and alpha hydroxy acids to increase spin–lattice relaxation constant T1 for hyperpolarized 13 …