Laser predissociation spectrum of SH⁺ (A³Π-X³Σ^-)

Abstract

Rotational lines in the 1–3 band of the A ³Π ← X ³Σ^- transition of the SH⁺ molecular ion have been recorded using a coaxial laser/ion beam technique. The rotational levels of A ³Π, v′ = 1 are predissociated, and the spectra are recorded by monitoring the production of S⁺ ions. The Doppler width in the fast ion beam is typically only 70 MHz and this permits resolution of proton nuclear hyperfine structure. From the analysis, hyperfine parameters for both electronic states have been determined (in MHz),

These parameters are interpreted in terms of the electronic structure of the SH⁺ molecular ion.