Photodissociation Dynamics of H2S+viaA2A1(1,8,0)Excited State
Excitation of vibration plays an important role in the pho-todissociation dynamics of molecules and ions.Experi-ments on the photodissocia-tion dynamics of molecular ions via well-defined excited vibrational states present a formidable challenge,particu-larly when it comes to the se-lective preparation of ions at the vibrational combination level.Here,using time-sliced veloci-ty map ion imaging,the photodissociation of H2S+via A2A1(v1=1,v2=8,v3=0,K=1)state leading to S+(4S)and H2 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 H2(J=1)and H2(J=3)ro-tational states were observed in a narrow photolysis energy region.This behavior was totally different from the results in recent studies on the photodissociation of H2S+where only a sin-gle vibrational mode v2 was excited for parent ions in A2A1(v1,v2,v3)states.The present study indicates that potential vibrational synergy effect was observed in the photodissocia-tion dynamics of H2S+when the parent ions were excited in a combinational vibrational mode.
Hydrogen sulfide cationVelocity map ion imagingVibrational combination modePhotodissociation dynamics
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