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Decomposition of polymers Characterization of crude oil Characterization of tobacco and coffee. After the ionization, the formed ions are accelerated into the reflectron time-of-flight mass analyzer where they are separated due to their different mass to charge ratios. A typical TOF mass spectrum can be generated in some milliseconds.
Hence, this fast on-line measurement system is a selective and sensitive analytical method to investigate complex gas mixtures such as from combustion processes. Rack configuration specification dependent: Data acquisition and visualization software: He, N2, Ar also air or O2 ion rate: The SPI mass spectrum shows that in addition to the dominating.
Due to the resonance stabilization of the styrene monomer the alkane backbone of the PS polymer readily is breaking after every second chain carbon, forming predominately styrene C2-phenyl unit. However, the occurrence of toluene C1-phenyl unit , phenyl propene C3-phenyl unit and phenyl butadiene C4-phenyl unit shows that other chain braking positions are possible, although less probable.
Crude oils are often characterized according to their physical properties such as density, viscosity, color, and odor. Furthermore, they may be distinguished by determining their chemical composition on a molecular level, which is challenging due to the enormous number of components present in the oils. In the displayed mass spectra alkanes linear and branched , cycloalkanes and substituted benzenes occur in long homologous series and are assigned by the different colored dots red, green and blue, respectively.
The SPI mass spectra from thermal analysis of different crude oils clearly show the advantage of soft photo ionization for the characterization of the evolving gases. Since fragmentation does not occur, each hydrocarbon may be identified according to its molecular peak. Different crude oils can be easily identified and characterized based on their distinct molecular patterns of the released compounds. The coupling is carried out via a heated capillary, which transfers the gas molecules evolving in the thermobalance into the ion source.