Determination of absolute photoionization cross-sections of nitrogenous compounds

The absolute photoionization cross-sections of 24 nitrogenous compounds were measured in the photon energy range from their respective ionization thresholds to 11.5 eV, including n-propylamine, iso-propylamine, n-butylamine, 2-butylamine, iso-butylamine, tert-butylamine, diethylamine, dibutylamine, triethylamine, aniline, benzylamine, n-methylaniline, cyclohexanamine, nitromethane, nitroethane, nitropropane, nitrobenzene, pyrrole, pyridine, pyrrolidine, morpholine, N,N-dimethylethanolamine, benzonitrile and benzeneacetonitrile. The experiments were performed by photoionization mass spectrometry with tunable synchrotron vacuum ultraviolet (VUV) light as an ionization source. Binary-liquid-mixtures of investigated and standard species were used in this measurement. As a good solvent, benzene was chosen as a calibration standard, since its photoionization cross-section had been well know. Moreover, photodissociative fragments were also presented.

Absolute photoionization cross-sections of 24 nitrogenous compounds were measured near ionization thresholds to 11.5 eV.Figure optionsDownload high-quality image (137 K)Download as PowerPoint slideResearch highlights
► Nitrogenous compounds can be found in coal, heavy oils and solid fuels from biomass to waste.
► Quantification of combustion species of these compounds is of great importance.
► We determined absolute photoionization cross-sections of 24 nitrogenous compounds.
► The data are important for quantification analysis of combustion intermediates.