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

一个简单的化学反应，也就是光解，将用冷的SO2分子来研究。冷二氧化硫是由种子超音速光束中的分子斯塔克减速产生的。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SO2激发能级的预解离产生了平移的和内部的冷碎片SO和O。碎片的过剩能量将被外场调谐以产生低动能的碎片。SO2及其光碎片对静电场和磁场的不同敏感性将被用来在具有保守势的陷阱中积累碎片。保守陷阱中冷分子的积累将是未来冷反应碰撞和冷化学方向实验的重要一步。被捕获的粒子稍后可以用来证明这些线的原理实验。此外，用于基础研究的高精度光谱学实验也成为可能。

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.