Knowledge Bank

Dichlorosilylenes have been detected in the branching chain reaction of the oxidation of dichlorosilane with $O2$ for the first time. The emission spectra of rarified flame were recorded under static and flow conditions over the pressure range $0,5-5$ Torr and $293-393K$ over the following intervals : $SiO(A1-X1)$ in the range 220-280 nm $SiCl2(A1B1-X1A1)$ in the range $300-380nmg$; the continious emission caused by the blackbody radiation from the solid particles over 400nm. The intensive absorption in the range of 210-260 nm has been also observed under static conditions. The simultaneous recording of the mentioned intermediates as well as conductivity (revealed $recentlyb$) during the single ignition has been performed. The peaks of the signals are staggered in time. The first peak in time is $SiCl2$ (coincident with SiO), the second is the absorption peak, the third is the visible emission coincident with conductivity peak. 10% additives (to fuel) of $SF6$ have a decreasing effect only on the absorption, visible emission and conductivity. It means that the absorbing intermediates contain Si-O bonds since $SF6$ has influence mainly on aerosol $formationc$.