Determination of ion quantity by using low-temperature ion density theory and molecular dynamics simulation  

作　　者：杜丽军 宋红芳 李海霞 陈邵龙 陈婷 孙焕尧 黄垚 童昕 管桦 高克林 

机构地区：[1]State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences [2]Key Laboratory of Atomic Frequency Standards, Wuhan Institute of Physics and Mathematics,Chinese Academy of Sciences [3]Center for Cold Atom Physics, Chinese Academy of Sciences [4]University of Chinese Academy of Sciences

出　　处：《Chinese Physics B》2015年第11期244-249,共6页中国物理B（英文版）

基　　金：supported by the National Basic Research Program of China(Grant Nos.2012CB821301 and 2010CB832803);the National Natural Science Foundation of China(Grant Nos.11004222 and 91121016);the Chinese Academy of Sciences

摘　　要：In this paper, we report a method by which the ion quantity is estimated rapidly with an accuracy of 4%. This finding is based on the low-temperature ion density theory and combined with the ion crystal size obtained from experiment with the precision of a micrometer. The method is objective, straightforward, and independent of the molecular dynamics （MD） simulation. The result can be used as the reference for the MD simulation, and the method can improve the reliability and precision of MD simulation. This method is very helpful for intensively studying ion crystal, such as phase transition, spatial configuration, temporal evolution, dynamic character, cooling efficiency, and the temperature limit of the ions.In this paper, we report a method by which the ion quantity is estimated rapidly with an accuracy of 4%. This finding is based on the low-temperature ion density theory and combined with the ion crystal size obtained from experiment with the precision of a micrometer. The method is objective, straightforward, and independent of the molecular dynamics （MD） simulation. The result can be used as the reference for the MD simulation, and the method can improve the reliability and precision of MD simulation. This method is very helpful for intensively studying ion crystal, such as phase transition, spatial configuration, temporal evolution, dynamic character, cooling efficiency, and the temperature limit of the ions.

关 键 词：ion crystal ion quantity low-temperature density model molecular dynamics simulation 

分 类 号：O561[理学—原子与分子物理]