Abstract
A gasoline-fueled engine is a major source emitting toxic compounds. It is important and necessary to detect and identify these exhaust emissions from engines. The gasoline combustion process in engines approximates to a premixed flame. In this experiment, a lean premixed gasoline/oxygen/argon flame at 2.00 kPa with an approximate fuel equivalence ratio (φ) of 0.75 has been studied with tunable synchrotron vacuum ultraviolet (VUV) photoionization and molecular-beam sampling mass spectrometry. About 80 species produced in the flame have been unambiguously identified by measurements of the photoionization mass spectrum and photoionization efficiency (PIE) spectra. In addition, mole fraction profiles of these species are derived at the selected photon energies near ionization thresholds, and the temperature profile was measured with a Pt/Pt−13%Rh thermocouple. Combined with the mole fraction profiles, the formation mechanism of some important radicals, oxygenated compounds, and stable intermediates are analy...
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