重离子环加速器SIS300上的精密光谱学
Precision Spectroscopy at Heavy Ion Ring Accelerator SIS300
摘要：
如果激光束与储存在德国达姆施塔特未来反质子和离子研究博览会设施的重离子环形加速器SIS 300中的相对论性锂离子相互作用，独特的光谱可能性就会打开。在相对论因子γ = 36时，任何元素的2S 1/2基态都能被倍频染料激光从共线几何中激发出2 P 1/2能级。精确的跃迁能量测量可以进行，如果荧光光子，在向前的方向推进到X射线区域，用单晶单色器进行能量分析。所有元素的超精细结构都可以在2 P 1/2 - 2S 1/2跃迁处进行研究，Z < 50的元素可以在2 P 3/2 - 2S 1/2跃迁处进行研究。同位素位移和核矩可以以前所未有的精确度测量，原则上即使是对于只有少数存储的具有已知核自旋的放射性物质。在激光冷却之后，5E-7量级的优良相对线宽是可行的，并且甚至可以通过光学泵浦制备偏振的外部光束。
英文摘要：
Unique spectroscopic possibilities open up if a laser beam interacts with relativistic lithium-like ions stored in the heavy ion ring accelerator SIS300 at the future Facility for Antiproton and Ion Research FAIR in Darmstadt, Germany. At a relativistic factor gamma = 36 the 2P 1/2 level can be excited from the 2S 1/2 ground state for any element with frequency doubled dye-lasers in collinear geometry. Precise transition energy measurements can be performed if the fluorescence photons, boosted in forward direction into the X-ray region, are energetically analyzed with a single crystal monochromator. The hyperfine structure can be investigated at the 2P 1/2 - 2S 1/2 transition for all elements and at the 2P 3/2 - 2S 1/2 transition for elements with Z < 50. Isotope shifts and nuclear moments can be measured with unprecedented precision, in principle even for only a few stored radioactive species with known nuclear spin. A superior relative line width in the order of 5E-7 may be feasible after laser cooling, and even polarized external beams may be prepared by optical pumping.
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