Photodissociation Dynamics of H2S+near 325 nm

We study the photodissociation dy-namics of the hydrogen sulfide cations(H2S+)using the time-sliced veloc-ity map ion imaging(VMI)technique and high-accuracy calculations.High-resolution ion images of the S+(4S)products were measured at four pho-tolysis wavelengths of 325.158,325.200,325.243,325.307 nm,which correspond to the excitation to the A2A1(0,13,0)K=1 state of H2S+.Rotational state-resolved total kinetic energy releases and angular distributions have been de-rived as a function of the photolysis wavelengths.Notably,photolysis wavelength dependent product rotational state and anisotropy parameter distributions have been clearly observed.Full-dimensional potential energy surface characterization suggests that nonadiabatic cou-pling between A2A1 and B2B2 states at C2v configurations,as well as relaxation of the symmetry to Cs in the conical intersection region between the two states,plays a key role in the photodissociation process.