Absorption Spectrum of the SiC2 Radical in the Gaseous Phase

Abstract

The stellar spectrum of certain N type stars in the blue–green region has been observed in the laboratory in absorption using the flash discharge technique. It has been interpreted as a 1Π ← 1Σ transition of the linear Si–C–C molecule. A new vibrational analysis has been proposed, which yields the following fundamental frequencies in cm−1. [Formula: see text] The 1Π state shows a small Renner splitting (εω2 = 3.3 cm−1). In addition, 001 and 040 levels are shown to perturb each other due to a Fermi resonance.