THE SPECTRUM OF SiH AND SiD

Abstract

Two new systems of SiH and SiD in the regions around 3 250 Å and 2 050 Å in addition to the well-known ²Δ−²Π system have been recorded in absorption and their rotational analysis (except for the ²Δ−²Π system of SiH) has been carried out. The new states are ²Σ⁺ at T₀ = 30 974.69 cm⁻¹ and ²Δ at T₀ = 48 603.46 cm⁻¹. The rotational constants for all the states known in SiD have been determined. The upper limit of the dissociation energy of SiH has been fixed at 24 680 cm⁻¹ by predissociation.