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Nonlinear Phenomena and Kinetic Mechanism of a Gaseous Branching Chain Process by the Example of Thermal Decomposition of Nitrogen Trichloride Read chapter Read first chapter

2017 | OriginalPaper | Chapter

4. Excited Intermediates in Silanes Combustion

Author : Nikolai M. Rubtsov

Published in: Key Factors of Combustion

Publisher: Springer International Publishing

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Abstract

It is shown that the flame emission in the region 400–600 nm in monosilane and dichlorosilane oxidation (initial pressures of 3–20 Torr; T0 = 300 K) is caused by radical luminescence processes on the surface of aerosol ultra-disperse particles of SiO2. The generation of energy by the interaction of gas-phase species with the SiO2 surface at initial stages of the phase formation depends on the presence of both the intrinsic structural defects =Si: and defects of Si+ implanted into SiO2. The addition of SF6 to the initial mixture results in the appearance of the emission bands due to the Si+ defects in the radical luminescence spectrum. Electronically excited HO2 radicals (A 1 A′–X 2 A′′), 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 reached behind the front of the 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. SF6 additives act as a reservoir that accumulates the vibrational energy in the developed ignition.

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previous chapter Electric Phenomena in Silanes Chlorination and Oxidation
next chapter Reactions of Hydro Peroxide Radicals in Hydrogen Combustion
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Metadata
Title
Excited Intermediates in Silanes Combustion
Author
Nikolai M. Rubtsov
Copyright Year
2017
Book
Key Factors of Combustion

Print ISBN: 978-3-319-45996-7

Electronic ISBN: 978-3-319-45997-4

Copyright Year: 2017

DOI
https://doi.org/10.1007/978-3-319-45997-4_4

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