【摘要】 本文用时间切片离子速度影像技术研究CS₂分子在204 nm附近的光解离动力学.在201.36、203.10、204.85和206.61 nm这四个解离波长下,实验清楚地观测到S（³P_J）+CS（X¹∑⁺）产物通道.在实验获得的S(³P_J=2,1,0)影像中,对应的CS（X¹∑⁺）产物的振动态结构得到了部分的分辨.通过对影像的分析,还获得了解离的总平动能谱以及产物的各项异性参数.实验观察到的相对小的各项异性参数表明产物更倾向于经历了间接的光解离过程.这一通道的自旋一轨道禁阻特征也说明了非绝热效应在二硫化碳紫外光解离生成S(³P_J=2,1,0)+CS（X¹∑⁺）的过程中发挥了重要作用.更多还原

【Abstract】 We study the photodissociation dynamics of CS₂ in the ultraviolet region using the time-sliced velocity map ion imaging technique.The S（³P_J）+CS（X¹Σ⁺） product channels were observed and identified at four wavelengths of 201.36,203.10,204.85 and 206.61 nm.In the measured images of S(³P_J=2,1,0),the vibrational states of the CS（X¹Σ⁺） co-products were partially resolved and the vibrational state distributions were determined.Moreover,the product total kinetic energy releases and the anisotropic parameters were derived.The relatively small anisotropic parameter values indicate that the S(³P_J=2,1,0)+CS（X¹Σ⁺） channels are very likely formed via the indirect predissociation process of CS₂.The study of the S(³P_J=2,1,0)+CS（X¹Σ⁺） channels,which come from the spin-orbit coupling dissociation process of CS2,shows that nonadiabatic process plays a role in the ultraviolet photodissociation of CS₂.更多还原