用交叉分子束研究氟原子与反式1,3-丁二烯分子的反应

摘要

利用改进型通用交叉分子束装置和脉冲直流放电产生脉冲氟原子束实验方法,研究了氟原子和1,3-丁二烯分子的反应散射.只有一个脱氢原子反应通道被观测到,没有观测到碳碳单键、碳碳双键断裂以及氟化氢分子的生成.直接测量到反应产物的角度分布和飞行时间质谱.通过把实验数据从实验室坐标系转化到质心坐标系,得到反应产物在不同质心角度下的平动能分布和角度分布.从反应产物的三维速度分布-角度分布-通量图中,得出氟原子和1,3-丁二烯反应生成氢原子的过程是通过形成了一个长寿命的中间体.%The fluorine atom reaction with trans-1,3-butadiene has been investigated by using the crossed molecular beam method. Signals at mass 72, 46 and 33 have been observed. A single reaction channel C4H5F+H is observed for this reaction channel. Product angular distributions and velocity distributions are determined. The experimental results indicate that the channel mainly proceeds via a long-lived complex at a collisional energy of 23.8 kJ/mol. The collision complex is likely formed with the F atom attacking the delocalized electrons in the direction perpendicular to the molecular plane of trans-1,3-butadiene molecule.