The A²Σ⁺–X²Π transition of SiCl revisited in the near ultraviolet

Abstract

High-resolution emission spectra were obtained from a hollow cathode discharge in SiCl₄/Ar mixtures. In the 360–450 nm region the emission of the transition of was detected and also the A²Σ⁺–X²Π transition of SiCl, previously analysed by Bredohl and co-workers. Some new bands of the A–X system of SiCl were identified and their rotational structure analysed. Improved molecular constants for the A²Σ⁺ state of SiCl have been obtained from the new data and those of Bredohl et al . For the emission of the transition of no vibrational or rotational structure could be resolved with a resolution of 10⁻³ nm.

Acknowledgements

I am indebted to Professor M. C. van Hemert for stimulating discussions.