用483.2nm的电离激光使CS2分子经由[3+1]REMPI制备出CS2+(X~2Πg,3/2)后,在270~285nm扫描解离激光获得了CS2+经由~B2Σu+←X~2Πg,3/2跃迁的光倒空和光碎片激发谱,由此给出了CS2+~B2Σu+电子态的振动频率ν1=613cm-1和2ν2=707cm-1.分析表明,正是CS2+的[1+1]双光子光激发解离过程导致了母体离子CS2+的光倒空和光解离成碎片离子CS+和S+,该过程中光碎片离子的分支比CS+/S+大约为3. CS2 + (X ~ 2Πg, 3/2) was prepared by [3 + 1] REMPI using ionization laser at 483.2nm. After dissociation of laser at 270 ~ 285nm, CS2 + was obtained via ~ B2Σu + ← X ~ 2Πg, / 2 transition and the excitation spectrum of optical fragment, the vibrational frequencies ν1 = 613cm-1 and 2ν2 = 707cm-1 for the CS2 + ~ B2Σu + electronic states are given. The analysis shows that it is exactly [1 + 1] The photo-induced photolysis dissociation led to the photodissociation and photodissociation of the precursor ions CS2 + into the fragment ions CS + and S +. The branching ratio of the photo-fragment ions in this process was about 3 for CS + / S +.