Optical spectrum of Si3C, and a re-analysis of the [formula omitted] transition

Abstract

The electronic spectrum of Si3C has been measured in the 710–250nm region by resonant two-color two-photon ionization spectroscopy. In addition to the strong C∼1B1←X∼1A1 transition near 400nm, evidence is found for two weaker features: a broad, largely structureless band near 625nm, which is assigned to A∼1B1←X∼1A1, and a band near 333nm with partially-resolved vibronic structure, which we assign to E∼1B1←X∼1A1. Assignment of the transitions and analysis of their vibrational structure is supported by equation-of-motion coupled cluster calculations. Re-measurement and re-analysis of the C∼←X∼ transition at higher spectral resolution and signal-to-noise ratio than that reported previously (Stanton et al., 2005) allows essentially all of the vibronic features to be assigned with confidence.