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Photodissociation Spectra of OCS+ via B2+←X2∏ Transitions
Dan-na Zhou, Li-min Zhang*, Lin Chen, Dan Wu
Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
Abstract:
In the wavelength range of 231-275 nm, we have studied the mass-resolved dissociation spectra of OCS+ via B2+←X23/2(000) and B2+←X21/2(000, 001) transitions by preparing OCS+ ions in the well-defined spin-orbit states. The spectroscopic constants of υ1(CS stretch)=828.9 (810.4) cm-1, υ2(bend)=491.3 cm-1 and υ3(CO stretch)=1887.2 cm-1 for OCS+(B2+) are deduced. The observed dependence of the υ2(bend) mode excitation of B2+ on the spin-orbit splitting of X2∏(Ω=1/2, 3/2) in the B2+←X2∏ transition can be attributed to the K coupling between the (000)21/2 and (010)2+1/2 vibronic levels of X2∏ state, which makes the B2+(010)←X21/2(000) transition possible.
Key words:  OCS+, Photodissociation, Bending vibration mode, K coupling
FundProject:
附件
OCS+分子经由B2+←X2∏跃迁的光解离谱
周丹娜, 张立敏*, 陈琳, 吴丹
中国科学技术大学化学物理系,合肥230026
摘要:
制备出确定旋轨态的OCS+(X2∏)离子,在260~325 nm波长范围内研究了OCS+经由B2+←X23/2(000)和B2+←X21/2(000,001)跃迁的分质量光解离谱.由光解离谱得到OCS+(B2+)电子态的光谱常数υ1(CS stretch)=828.9(810.4) cm-1,υ2(bend)=491.3 cm-1和υ3(CO stretch)=1887.2 cm-1.在B2+←X2∏跃迁谱中只能观察到B2+(010)←X21/2(000)跃迁的谱峰, 而观察不到B2+←X23/2(000)跃迁的谱峰. 用X2∏电子态的(000)21/2和(010)2+1/2电子振动能级之间的K耦合解释了这种B2+的υ2弯曲振动模的激发对X2∏电子态的旋轨分裂分量(Ω=1/2,3/2)的相关性
关键词:  OCS+,光解离,弯曲振动模,K耦合
DOI:10.1063/1674-0068/26/03/265-269
分类号: