通过长寿命单重态探究标量耦合差异。
Probing scalar coupling differences via long-lived singlet states.
作者信息
DeVience Stephen J, Walsworth Ronald L, Rosen Matthew S
机构信息
Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford St., Cambridge, MA 02138, USA.
Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138, USA; Department of Physics, Harvard University, 17 Oxford St., Cambridge, MA 02138, USA; Center for Brain Science, Harvard University, 52 Oxford St., Cambridge, MA 02138, USA.
出版信息
J Magn Reson. 2016 Jan;262:42-49. doi: 10.1016/j.jmr.2015.12.003. Epub 2015 Dec 12.
We probe small scalar coupling differences via the coherent interactions between two nuclear spin singlet states in organic molecules. We show that the spin-lock induced crossing (SLIC) technique enables the coherent transfer of singlet order between one spin pair and another. The transfer is mediated by the difference in syn and anti vicinal or long-range J couplings among the spins. By measuring the transfer rate, we calculate a J coupling difference of 8±2mHz in phenylalanine-glycine-glycine and 2.57±0.04Hz in glutamate. We also characterize a coherence between two singlet states in glutamate, which may enable the creation of a long-lived quantum memory.
我们通过有机分子中两个核自旋单重态之间的相干相互作用来探测小的标量耦合差异。我们表明，自旋锁定诱导交叉（SLIC）技术能够实现单重态序在一个自旋对与另一个自旋对之间的相干转移。这种转移由自旋之间顺式和反式邻位或远程J耦合的差异介导。通过测量转移速率，我们计算出苯丙氨酸 - 甘氨酸 - 甘氨酸中的J耦合差异为8±2mHz，谷氨酸中的J耦合差异为2.57±0.04Hz。我们还表征了谷氨酸中两个单重态之间的相干性，这可能有助于创建长寿命量子存储器。
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