Abstract
A quantitative absorption diagnostic for ppm amounts of silylidyne radicals (SiH) was developed. The SiH radicals were produced in high diluted mixtures of silane (SiH 4) in Ar with and without additional H 2 at high temperatures. The experiments were performed in the reaction zone behind reflected shock waves at temperatures between 1300 and 3000 K and at pressures 0.9 ⩽ p ⩽ 2.5 bar. The SiH radicals were detected by time-resolved narrow-bandwidth laser absorption measurements near λ = 413 nm. A spectroscopic model was introduced to describe the absorption cross section of the SiH single line transitions in the A- X(0,0) band. The SiH absorption-over-time profiles could be transformed into concentration time histories by applying this model. The detection limit of the present quantitative ring dye laser absorption diagnostic for shock tube applications was about 1 × 10 12 cm −3 and is thus well suited for kinetic studies of elementary reactions involving SiH radicals.
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