三维离子成像技术研究里高密度德堡态NO分子产生的超低温等离子体空间结构及膨胀过程

项目名称： 三维离子成像技术研究里高密度德堡态NO分子产生的超低温等离子体空间结构及膨胀过程

项目编号： No.11304311

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 刘金波

作者单位： 中国科学院大连化学物理研究所

项目金额： 26万元

中文摘要： 高密度低温里德堡态分子（原子）的自发演化可以形成超低温等离子体（Ultracold plasma，UCP），UCP 能模拟天体环境、热核聚变和反物质产生过程中的强耦合现象，为这些极端环境中的动力学过程研究提供帮助。研究UCP 的膨胀演化过程及影响因素，对维持等离子体的强耦合状态非常有利，进而有助于上述重大基础问题的研究。目前我们已搭建了一套在分子束中产生超低温等离子体的实验装置，并产生了具有一定耦合强度的超低温等离子体。本项目拟建立一种适用于分子束中高速运动的超低温等离子体的三维成像探测方法，研究超低温等离子体的空间结构及膨胀演化过程；通过调整UCP中负离子的产率，改变UCP中无序诱导加热和三体复合加热的作用速率及权重，结合理论建模工作，研究负离子影响超低温等离子体膨胀过程的规律。旨在探索超低温等离子体的内部结构及演化规律，验证并完善超低温等离子体的膨胀演化动力学理论。

中文关键词： 超低温等离子体；负离子；强耦合；长寿命；

英文摘要： The spontaneous ionization of dense Rydberg molecules in a molecule beam could form ultracold plasma. Ultracold plasma is one of the most promising methods to reach the strongly coupled regime, which is helpful for intense field physics, astrophysics and nuclear fusion as its possibility to create a controllable and detectable strongly coupled system. Experimental methods to prepare much denser and colder plasma and expand its lifetime are valuable for strongly coupled research, which together with ultracold plasma evolution dynamic process are important targets in this new field. We will study the preparation and detection methods of ultracold plasma in a supersonic molecule beam, and the possibility to inhibit its heating process by the use of Rydberg molecules. A novel movable time-sliced ion imaging technology will be used to monitor the 3D intensity distribution of ultracold plasma and its variation with delay time, and the expansion process will be studied by this novel method. The presence of anions slows the disorder induced heating and three body recombination, and finally slows the expansion velocity of UCP. However, the operation mechanisms of these heating process are distinct in principle, and their influence resulting from the presence of anions are different .luckily, the anions formation efficie

英文关键词： ultracold plasma；anion；strong coupled；long lifetime；