魏达秀老师于CHEMPHYSCHEM期刊发表文章

本实验室魏达秀老师在CHEMPHYSCHEM期刊发表了题为《Preparation of long-lived states in a multi-spin system by using an optimal control method》的文章，通讯作者为姚叶峰老师，发表日期为2020年3月31日。（DOI: 10.1002/cphc.202000038R1）

The lifetimes Ts of a long-lived nuclear spin state(LLS) could be much longer than the longitudinal order T₁. Many spin systems were used to produce long-lived states, including two or more homonuclear spins that couple to each other. For multiple homonuclear spins with rather small chemical shift difference, normally it is difficult to selectively control the spins and then to prepare a LLS. Here, we present a scheme that prepares different spin orders in a multi-spin system by using optimal control and numerical calculation. By experimentally measuring the lifetime of the states, we find that for a three-spin physical system, although there are many forms of state combinations with different spin orders, each component has its own lifetime.

长寿命的核自旋态(LLS)的寿命可能比纵向阶数T1长得多。许多自旋系统被用来产生长寿命状态，包括两个或更多的同核自旋相互耦合。对于化学位移差很小的多个同核自旋，通常很难有选择地控制自旋，然后制备LLS。在此，我们提出了一种利用最优控制和数值计算在多自旋系统中制备不同自旋体系的方案。通过实验测量三自旋系统的单态寿命，我们发现，虽然有许多不同自旋单态组合形式，但每个组分都有自己的态寿命。