By Gould R.F. (ed.)
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Extra resources for Azeotropic Data II
It is operated via a real-time Windows based software package that is used for data acquisition and analysis. A dual thoriated-iridium filament is used for electron emission and a Faraday cup sensor is used for measuring ion currents. 0 rnA, and the electron energy is set to 70 eV, All of these parameters can be changed via software. During use, the gases present in the deposition chamber are pumped into the DPQMS chamber by opening valve e fully and adjusting metering valve D to the desired setting.
7: The vapor pressure of the monomer from reference  and for xylene. 3. Dimer-to-Monomer Conversion The quantitative conversion of dimer to monomer has been studied as a function of pyrolysis furnace temperature in . 0 minutes and continuously monitoring the 104 amu monomer peak using a differentially pumped quadrupole mass spectrometer (DPQMS). The 104 amu peak is due only to the presence of the monomer in the deposition chamber. 9 + %) as liners of the stainless steel pyrolysis tube. 9 shows the relationship between percent conversion and pyrolysis temperature for two experiments performed with quart~, copper, and nickel as liners for the stainless steel pyrolysis zone.
6: The singlet and triplet states of the monomer with the asterisks signifying radicals. The vapor pressure of the monomer has been estimated by Ganguli using the Ambrose group contribution method . 7. 2 Mass Spectrometer Fragmentation Patterns The fragmentation patterns for the monomer as a function of ionizing electron energy was obtained in reference  at pyrolysis temperatures of '665 ± 5°C. 8. 2. At 25 eV the only two significant peaks are the monomer (Ci3H;lJ at 104 amu and C 6 Ht at 78 amu.