Ultracold collisions of metasstable calcium atoms in an optical dipole trap

光学偶极子陷阱中亚稳态钙原子的超冷碰撞

• 批准号: 37271882
• 负责人: Professor Dr. Andreas Hemmerich
• 金额: --
• 依托单位: Institut für Laser-Physik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2007
• 资助国家: 德国
• 起止时间: 2006-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/37271882?language=en
• 关键词: Ultracold; collisions; metasstable; calcium; atoms

We plan to explore the collision properties of ultracold, long-lived metastable calcium (40Ca) atoms confined in an optical dipole trap. We will study 3P2 samples with controlled occupation of the magnetic sub-levels at variable magnetic fields (0 – 200 Gauss) as well as non-magnetic 3P0 samples, which are of particular interest for atomic clock applications. We will explore a novel fully continuous loading scheme, which promises to yield large trap populations and high densities in the 3P0 dipole trap. The planned measurements of collision cross-sections permit a detailed comparison with ab initio calculations, and thus challenge state of the art quantum collision theory. We have agreed upon a collaboration with two leading theory groups for this task. Depending on our findings regarding the 3P0 collision properties, we will proceed to implement crossed dipole traps and evaporation cooling to extend the collision studies to lower temperatures and higher densities, and to explore the possibility of quantum degenerate 3P0 samples.

我们计划探索超冷，长寿命的亚稳态钙（40 Ca）原子的碰撞性质限制在一个光学偶极陷阱。我们将研究在可变磁场（0 - 200高斯）下磁子级受控占据的3 P2样品以及非磁性3 P0样品，这些样品对原子钟应用特别感兴趣。我们将探索一种新的完全连续的加载计划，这有望产生大的陷阱人口和高密度的3 P0偶极陷阱。计划中的碰撞截面测量允许与从头计算进行详细的比较，从而挑战最先进的量子碰撞理论。我们已经同意与两个主要的理论小组合作完成这项任务。根据我们关于3 P0碰撞性质的发现，我们将继续实施交叉偶极陷阱和蒸发冷却，以将碰撞研究扩展到更低的温度和更高的密度，并探索量子简并3 P0样品的可能性。

项目成果

Alternative route to Bose-Einstein condensation of two-electron atoms

双电子原子玻色-爱因斯坦凝聚的替代途径

• DOI: 10.1103/physreva.85.031603
• 发表时间: 2011
• 期刊: Physical Review A
• 影响因子: 2.9
• 作者: Purbasha Halder;Chih-Yun Yang;Andreas Hemmerich
• 通讯作者: Andreas Hemmerich