Band systems for four different ground state electronic transitions in the visible region were recorded for gold sulfide (AuS). The molecules were generated in a hollow cathode sputtering source and probed by laser excitation spectroscopy with a pulsed dye laser. The ground state is an inverted 2Π state, and the assignments for the four transitions were determined to be A2Σ–X2Π3/2, B2Σ–X2Π3/2, C2Δ3/2–X2Π3/2, and C2Δ5/2–X2Π3/2. In addition, transitions from the upper 2Π1/2 spin orbit component of the ground state were also seen to both 2Σ states as well as to the C2Δ3/2 state. We have fitted the vibrational band origins to determine the term energies and vibrational constants of each state. We also determined the X2Π spin-orbit splitting to be 1304 cm–1. Finally, the C2Δ3/2–X2Π1/2 (0,0) band was recorded at high resolution using a single-mode ring laser in order to resolve the rotational structure, enabling us to determine the rotational and centrifugal distortion constants of these two states.

Electronic spectroscopy of gold sulfide (AuS)

249th National Meeting (2015)

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