Laser resonance ionization mass spectroscopy of radioactive isotopes

“放射性同位素的激光共振电离质谱学”项目旨在调查At、Ra、Ac和鳗系元素的同位素光学同位素位移的趋势-其中许多元素以前从未被测量过。激光共振电离作为一种高灵敏度、高选择性的痕量探测方法，可以探测原子核的基态和长寿命同质异构态的核结构。与能够获取大量特定元素同位素的放射性离子束设施相结合，这项技术可以用来绘制从稳定性到滴流线的核结构演变图。核信息是通过探测原子核的原子电子的激光光谱学来获取的。这种相互作用是一种灵敏的、非破坏性的探测器，允许以一种基本上独立于模型的方式提取微妙的核效应。可测量的特殊核性质是：核自旋、磁偶极矩和电四极矩，以及核链中特定元素的同位素均方根电荷半径的变化。在某些情况下，也可以提取诸如磁八极矩之类的高阶效应。

The program in "Laser resonance ionization mass spectrometry of radioactive isotopes" seeks to investigate trends in the optical isotope shifts in isotopes of At, Ra, Ac, and the actinide elements – many of which have not been measured before. Laser resonance ionization has emerged as a highly sensitive and selective method in trace detection, which also allows to probe nuclear structure of ground state and long lived isomeric states of atomic nuclei. In combination with radioactive ion beam facilities that give access to a great number of isotopes of particular elements, this technique can be used to map the evolution of nuclear structure from stability out to the drip lines. The nuclear information is accessed via laser spectroscopy of the atomic electrons that probe the nucleus. This interaction is a sensitive, non-destructive probe that allows to extract subtle nuclear effects in a largely model independent way. The particular nuclear properties measureable are: nuclear spin, magnetic dipole and electric quadrupole moments and changes in the root mean square charge radii among isotopes of a specific element in a nuclear chain. In some cases higher order effects such as magnetic octupole moments can be extracted as well.