CAJ | 학술논문

氧硫化碳（OCS ）在吸收230 nm左右的光子后迅速解离，生成的CO （X1Σ＋g ，v＝0，J＝42～65）碎片通过（2＋1）共振增强多光子电离后检测．通过对CO＋进行速度成像，获得了CO＋的平动能布居和角度分布．除了主要的单重态通道S（1D）＋CO（X1Σ＋g ，v＝0）以外，三重态解离通道形成的S（3 P）原子也被观测到，其通道分支比约为0.5％，并且随CO的转动激发而略增加．结合最新计算的OCS电子激发态势能面，获得了OCS的三重态解离机理：OCS吸收230 nm光子被激发至A 1 A′态，进而通过旋轨耦合至b3 A″态解离．
양류화탄（OCS ）재흡수230 nm좌우적광자후신속해리，생성적CO （X1Σ＋g ，v＝0，J＝42～65）쇄편통과（2＋1）공진증강다광자전리후검측．통과대CO＋진행속도성상，획득료CO＋적평동능포거화각도분포．제료주요적단중태통도S（1D）＋CO（X1Σ＋g ，v＝0）이외，삼중태해리통도형성적S（3 P）원자야피관측도，기통도분지비약위0.5％，병차수CO적전동격발이략증가．결합최신계산적OCS전자격발태세능면，획득료OCS적삼중태해리궤리：OCS흡수230 nm광자피격발지A 1 A′태，진이통과선궤우합지b3 A″태해리．
Carbonyl sulfide (OCS) was excited and dissociated at ~230 nm ,and the CO(X1Σ+g ,v=0 ,J=42~65) fragment was detected by using (2+1) resonance‐enhanced multiphoton ionization at 229.825~230.000 nm .From the velocity map image of CO + ,the kinetic energy and angular distributions of CO fragments were directly obtained .Besides the dominated channel of S (1 D)+CO(X1Σ+g ,v=0) ,S(3 P) atom was also observed in photodissociation of OCS at 230 nm .The branching ratio of the S (3 P) channel was about 0.5% ,and slightly increased with the rotational excitation of CO fragment from J=56 to 65 .With the aid of the recent high‐level potential energy surfaces of the excited electronic states of OCS ,the S(3 P) formation mechanism was proposed .Once absorbing an ultraviolet photon at ~230 nm ,the excited OCS in A1 A′state is produced initially ,and then dissociates to yield S (3 P) atom via spin‐orbital coupling to b3 A″state .