Development of a Technique of Dynamic Nuclear Self Polarization for Measurements of Nuclear Magnetic Moment of Unstable Nuclei

动态核自极化（DYNASP）是由Dyakonov等人在理论上预测的。该现象在低于临界温度（Tc）的III-V族半导体中观察到。当用线偏振光将电子激发到导带时，晶格核通过电子与晶格核之间的接触超精细相互作用而在很大程度上自极化。DYNASP理论通过考虑传导电子被圆偏振光极化而得到推广。为了研究DYNASP现象低于4 K，已经开发了一种装置。该系统适用于含不稳定核样品的核磁共振实验和含稳定核样品的脉冲核磁共振实验。

Dynamic Nuclear Self Polarization(DYNASP) was theoretically predicted by Dyakonov et al. The phenomenon is observed in III-V semiconductors below a critical temperature(Tc). When electrons are excited to the conduction band with linearly polarized light, the lattice nuclei are largely self-polarized through the contact hyperfine interaction between the electrons and the lattice nuclei. The DYNASP theory was generalized by taking account of the conduction electrons polarized with circularly polarized light. To examine the DYNASP phenomenon below 4 K, an apparatus has been developed. The system is applicable to-NMR experiments for samples containing unstable nuclei, and pulsed NMR experiments for samples of stable nuclei.