Note: Single-ultraviolet-photon dissociation dynamics of ${\rm CS}_{\rm 2}^ + (\tilde X{}^2\Pi _g)$ CS 2 + ( X ̃ 2 Π g ) in 227-243 nm revealed by time-sliced velocity map imaging

The single-UV-photon (227-243 nm) dissociation of ${\rm CS}_2^ + (\tilde X{}^2\Pi _{g,3/2,1/2})$ CS 2 + ( X ̃ 2 Π g , 3 / 2 , 1 / 2 ) into the S + ( 4 S )CS( X 1 )Σ + channel was investigated by means of time-sliced velocity map imaging technique. In the high-energy region of the $\tilde B{}^2\Sigma _u^ +$ B ̃ 2 Σ u + state, a rather subtle photodissociation dynamics was observed, i.e., a slight variation in the excitation photon energy may lead to a drastic change in the vibronic distributions of the C S ( X 1 Σ + ) fragments originating from the two spin-orbit $\tilde X{}^{\rm 2}\Pi _g$ X ̃ 2 Π g states. The photodissociation mechanisms involved here may be interpreted as being due to the complex interplay among various vibronic and spin-orbit interactions in this energy region of ${\rm CS}_{\rm 2}^ +$ CS 2 + . It is quite impressive that, for such a simple triatomic cation species, ${\rm CS}_{\rm 2}^ +$ CS 2 + , there exhibits such complexity and subtlety in its photodissociation dynamics.