Abstract

Electronically excited HO2.radicals (A2A"–X2A""), OH.radicals (ν= 2 – 0), and HCl molecules (ν= 3 – 0) are identified using the emission spectra at 0.8–1.6 μm in the rarefied flame in dichlorosilane combustion at 293 K and low pressures. The spectrum also contains the composite bands of the H2O (0.823 μm) and H2O2(0.854 μm) molecule vibrations. The maximum intensity of emission of these species is attained behind the front of the active chemical transformation, and the equilibrium between the vibrational and translational degrees of freedom is established in the region of the regular thermal regime of cooling. SF6additives act as a reservoir that accumulates the vibrational energy in developed ignition. The processes responsible for the inhibition of dichlorosilane oxidation by SF6additives are considered.

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