Photodissociation dynamics of H₂S⁺ via A²A₁(1,8,0) excited state

Li, Jie1; Wang, Yaling1; Tan, Yuxin1; Zhang, Ning1; Wang, Wenxin1; Hu, Liru1; Yuan, Daofu2; Wang, Xingan1; Yang, Xueming3,4

2024-04-01

10.1063/1674-0068/cjcp2310097

CHINESE JOURNAL OF CHEMICAL PHYSICS   影响因子和分区

1674-0068

2327-2244

Excitation of vibration plays an important role in the photodissociation dynamics of molecules and ions. Experiments on the photodissociation dynamics of molecular ions via well-defined excited vibrational states present a formidable challenge, particularly when it comes to the selective preparation of ions at the vibrational combination level. Here, using time-sliced velocity map ion imaging, the photodissociation of H2S+ via A(2)A(1)(v(1)=1, v(2)=8, v(3)=0, K=1) state leading to S+(S-4) and H-2 products was investigated. The excited H2S+ cations were prepared by multiphoton ionization of H2S, followed by resonant excitation. Images of S+ ions were captured at six wavelengths ranging from 357.02 nm to 358.38 nm. From the ion images, the total kinetic energy release distributions and rotational state-specific anisotropy parameters were derived. Notably, repeatedly reversed branching ratios of the H-2 (J=1) and H-2 (J=3) rotational states were observed in a narrow photolysis energy region. This behavior was totally different from the results in recent studies on the photodissociation of H-S(+) where only a single vibrational mode v(2) was excited for parent ions in A(2)A(1)(v(1), v(2), v(3)) states. The present study indicates that potential vibrational synergy effect was observed in the photodissociation dynamics of H2S+ when the parent ions were excited in a combinational vibrational mode.

Hydrogen sulfide cation Velocity map ion imaging Vibrational combination mode Photodissociation dynamics

SCI ; EI

英语

其他

National Natural Science Foundation of China[22125302]

Physics

Physics, Atomic, Molecular & Chemical

WOS:001239482700004

CHINESE PHYSICAL SOC

Web of Science

1.Univ Sci & Technol China, Dept Chem Phys, Hefei 230026, Peoples R China
2.Univ Sci & Technol China, Hefei Natl Res Ctr Phys Sci Microscale, Hefei 230026, Peoples R China
3.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam, Dalian 116023, Peoples R China
4.Southern Univ Sci & Technol, Sch Sci, Dept Chem, Shenzhen 518055, Peoples R China

Li, Jie,Wang, Yaling,Tan, Yuxin,et al. Photodissociation dynamics of H₂S⁺ via A²A₁(1,8,0) excited state[J]. CHINESE JOURNAL OF CHEMICAL PHYSICS,2024,37(2).

Li, Jie.,Wang, Yaling.,Tan, Yuxin.,Zhang, Ning.,Wang, Wenxin.,...&Yang, Xueming.(2024).Photodissociation dynamics of H₂S⁺ via A²A₁(1,8,0) excited state.CHINESE JOURNAL OF CHEMICAL PHYSICS,37(2).

Li, Jie,et al."Photodissociation dynamics of H₂S⁺ via A²A₁(1,8,0) excited state".CHINESE JOURNAL OF CHEMICAL PHYSICS 37.2(2024).