Rotationally resolved spectroscopy of the A ̃ A 2 1 ← X ̃ B 2 1 transition of H 2 S + above the barrier to linearity using the mass-analyzed threshold ionization photofragment excitation technique Photodissociation of the H 2 S molecule at 157.6 nm was studied experimentally using the Rydberg tagging technique. Translational energy distributions of the H-atom product from the H 2 S photodissociation were measured, and the SH(X 2 ⌸)ϩH͑ 2 S͒ channel was found to be the dominant dissociation process. Spin-orbit and rovibrational state distributions were also obtained for the SH product, which was found to be both vibrationally and rotationally excited. An intriguing bimodal rotational distribution in the lowest two vibrational states, vϭ0 and 1, has been clearly observed for the SH product, indicating that there are two distinctive dissociation mechanisms involved in the photodissociation of H 2 S at 157 nm excitation.
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