HN3分子在190-248 nm的紫外光分解动力学

利用氢原子里德堡态飞行时间谱技术研究HN3分子在紫外光(190?248 nm)光照射下的H+N3通道的光解动力学结果．通过测量H+N3通道的产物平动能分布以及产物的角分布，得到了在不同波长光解下N3产物分子的振动态分布． 实验结果表明， 在大于225 nm时，HN3分子主要是通过一个排斥态解离的．而在低于225 nm时，有一个慢的通道从220 nm 开始出现．这一新的解离通道是一个闭环产生环状N3产物的通道．当光解能量增加时，这一新通道相对的变得越来越重要．

UV Photodissociation Dynamics of HN3 in 190-248 nm

The H+N3 channel in the ultraviolet photodissociation of HN3 has been investigated from 190 nm to 248 nm using the high-n Rydberg H-atom time-of-°ight technique. Product translational energy distributions as well as product angular anisotropy parameters were determined for the H+N3 channel at di?erent photolysis wavelengths. N3 vibrational state distribution has also been derived from the product translational energy distribution at these wavelengths. Above photolysis wavelength 225 nm, HN3 predominantly dissociate through the repulsive state. Below 225 nm, a new slow channel starts to appear at 220 nm in addition to the existing channel. This channel is attributed to a ring closure dissociation channel to produce the cyclic N3 product. As photolysis energy increases, this new channel becomes more important.