Generation of cold CO and O photo-fragments in external fields from Stark-decelerated SO2 and trapping of the particles

斯塔克减速 SO2 在外部场中产生冷 CO 和 O 光碎片并捕获颗粒

• 批准号: 84579730
• 负责人: Privatdozent Dr. Christian Lisdat
• 金额: --
• 依托单位: Physikalisch-Technische Bundesanstalt (PTB)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2012-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/84579730?language=en
• 关键词: Generation; cold; CO; photo; fragments

A simple chemical reaction, namely photodissociation, will be investigated with cold SO2 molecules. The cold SO2 is produced by Stark deceleration of molecules in a seeded supersonic beam. The decelerator makes use of the force on the permanent electric dipole moment of SO2 generated by spatially inhomogeneous and time-varying electrical fields to slow down the translational motion of the molecules. The predissociation of appropriately selected excited levels of SO2 generates translationally and internally cold fragments SO and O.The excess energy of the fragments will be tuned by external fields to produce fragments with low kinetic energy. The different sensitivity of SO2 and its photo-fragments to static electric and magnetic fields will be employed to accumulate fragments in a trap with conservative potential. The accumulation of cold molecules in a conservative trap will be an important step for future experiments in the direction of cold reactive collisions and cold chemistry. The trapped particles can later be used for a proof of principle experiment along these lines. Also, experiments for high precision spectroscopy for fundamental research become possible.

一个简单的化学反应，即光解离，将与冷SO2分子进行研究。冷SO2是由种子超音速束中分子的斯塔克减速产生的。该减速器利用空间不均匀和时变电场对SO2的永久电偶极矩产生的力来减缓分子的平移运动。适当选择的激发能级的SO2的预解离产生摩擦和内部冷的碎片SO和O。碎片的多余能量将被外部场调谐以产生具有低动能的碎片。利用SO_2及其光致碎片对静电场和磁场的不同敏感性，将碎片聚集在具有保守势的阱中。在保守阱中积累冷分子将是未来实验朝着冷反应碰撞和冷化学方向迈出的重要一步。被捕获的粒子以后可以用于沿着这些路线的原理实验的证明沿着。此外，用于基础研究的高精度光谱学实验也成为可能。