| 报告题目 | Quantum-state controlled ultracold molecular ions and their applications (量子态可控超冷分子离子及其应用) |
| 报告人 | 童昕 研究员 |
| 报告人单位 | 中科院武汉物理与数学研究所研究员 |
| 报告时间 | 2016-01-11 |
| 报告地点 | 西区科技实验楼东楼1617 |
| 主办单位 | 合肥微尺度物质科学国家实验室、化学物理系 |
| 报告介绍 | 报告摘要：
Thegenerationand study of translationally cold (T<< 1K) molecules and molecular ions represents one of the most recent and exciting new developments in physical chemistry. Molecular ions can be cooled and Coulomb crystallized by exchanging kinetic energy with laser cooled atomic ions by means of the Coulomb interaction (“sympathetic cooling”) thus forming bi-component or “molecular” Coulomb crystals. However sympathetically cooled molecular ions are only translationally cold, their internal degrees of freedom are generally in thermal equilibrium with the environment because of the coupling to the ambient black-body radiation (BBR) field.
Using N2+ as a test system, a new method has been developed to produce internal quantum-state selected, translationally cold (mK) molecular ions in a quadrupole ion trap. The approach is based on the initial generation of the N2+ ions in a desired quantum state using state-selective threshold-photoionization followed by sympathetic cooling of their translation motion. The talk also discusses the performance of this new method, and highlights applications of sympathetically-cooled, state-selected ions on molecular collision dynamics and precision spectroscopy. |
