A shock tube study of the reaction of H atoms with SiCl₄

The reaction of H atoms with SiCl₄ was studied behind reflected shock waves at temperatures between 1530 K and 1730 K and pressures around 1.5 bar by applying atomic resonance absorption spectroscopy (ARAS) for time resolved measurements of H atoms at the L_α -line. The thermal decomposition of a few ppm ethyl iodide (C₂H₅l) was used as a H- atom source. In the presence of a high excess of the molecular reactant SiCl₄ a slow consumption of H was observed, which follows a pseudo-first-order rate law. Rate coefficient for the consumption of H by the reaction: H + SiCl₄ →k^lSiCl₃ + HCl (R1) was determined to be: k_l = 1.4 × 10¹³ exp(-4800 K/T) cm³ mol^-1 s^-1.