【摘要】 某些无放射性的具有自旋特性的惰性气体同位素(如³He和¹²⁹Xe),可通过激光抽运超极化,得到很高的非热平衡极化度和长驰豫时间的惰性气体。极化后惰性气体同位素核磁共振的灵敏度提高10³～10⁵倍。介绍了目前极化惰性气体常用的两种方法——自旋交换光抽运和亚稳态能级交换。更多还原

【Abstract】 Non-radioactive noble gases with a nuclear spin(³He,¹²⁹Xe)can be hyperpolarized by optical pumping to produce noble gases with large nonequilibrium nuclear polarization and long relaxation time.The spin polarization of laser-polarized ¹²⁹Xe and ³He is in the range of 10⁴～10⁵ times the Boltzmann polarization of the ¹²⁹Xe and ³He in the same magnetic field.Two methods of polarization now:spin exchange and metastability exchange are reviewed.更多还原