Measurement of the absorption cross sections of SiCl4, SiCl3, SiCl2 and Cl at H Lyman- wavelength

Atomic resonance absorption spectroscopy coupled with a shock tube is a powerful technique for studying high temperature dynamics of reactive systems. Presently, high temperature pyrolysis of SiCl4–Ar mixtures has been studied behind reflected shock waves. Using time-resolved absorption profiles at 121.6 nm and a detailed reaction model, the absorption cross sections of SiCl 4 , SiCl 3 , SiCl 2 and Cl have been measured. Results agree well with available data for SiCl 4 and constitute, to our knowledge, the first measurements for SiCl 3 , SiCl 2 and Cl at the Lyman- α wavelength. These data are relevant to silica particle production from SiCl 4 -oxidant mixtures combustion synthesis.