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        "quote": "- [<u id=\"concept-7-nuclear-magnetic-resonance-spectroscopy\" class=\"concept-term\" data-concept-identity=\"urn:uuid:13e70843-34ca-4e4e-9bc3-d336dbb4c734\" data-concept-route=\"/concept-identities#concept-13e70843-34ca-4e4e-9bc3-d336dbb4c734\">核磁共振波谱学(nuclear magnetic resonance spectroscopy)</u>](../../../../../concepts/quantum-mechanics/nuclear-magnetic-resonance)：自旋为 $1/2$ 的系统可以置于随时间变化的磁场 $\\mathbf B(t)$ 中，此时仍由同一个[薛定谔方程](../../../../../concepts/quantum-mechanics/schrodinger-equation)描述，但不能再仅靠对单个矩阵取指数来求解。原子核具有自旋为 $1/2$ 的系统，可用随时间和空间变化的磁场进行探测，从而对材料成像。",
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