The antiphase character of the PHIP associated signals after a hydrogenation reaction is particularly sensitive to line broadening introduced by magnetic field inhomogeneities and interferences by the presence of resonance lines steaming from a large amount of thermally polarized spins. These obstacles impose a limitation in the detection of reaction products as well as in the experimental setups. A simple way to overcome these impediments consists of acquiring the signal with a train of refocusing pulses instead of a single r.f. pulse. We present here a number of examples where this multipulse acquisition, denominated PhD-PHIP, displays its potentiality in improving the information related to hyperpolarized spins performed in a sample, where the former parahydrogen nuclei are part of a complex J-coupling network.

中文翻译：

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通过多脉冲序列中的演化​​来区分 PHIP 信号

氢化反应后 PHIP 相关信号的反相特征对由磁场不均匀性引起的谱线加宽和由大量热极化自旋产生的共振谱线的存在引起的干扰特别敏感。这些障碍限制了反应产物的检测以及实验设置。克服这些障碍的一种简单方法是使用一系列重新聚焦脉冲而不是单个射频脉冲来获取信号。我们在这里展示了一些例子，其中这种多脉冲采集，命名为博士-PHIP，显示其在改善与样品中执行的超极化自旋相关的信息方面的潜力，其中前副氢原子核是复杂J 的一部分- 耦合网络。