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- W2038662972 abstract "It is shown how Langmuir probes can be used in flames to obtain not only the positive ion concentration but electron concentrations and electron temperatures. An internal method is presented for checking the results by comparing the wall potential calculated from the above three quantities with the observed wall potential. Satisfactory agreement between these two values in hydrocarbon air/or oxygen flames from 1.5 to 760 mm Hg increases the confidence in the use of Langmuir probes to obtain plasma profile properties in flames. The accuracy of positive ion and electron collision cross sections appears to be the major factor limiting the accuracy of the probe. Detailed results are presented for a number of flames. The positive ion concentration always exceeds the electron concentration indicating the formation of negative ions. Electron temperatures exceed the gas temperature and do not decay as rapidly as might be expected. A mass spectrometric technique for obtaining ion profiles of good spatial resolution is outlined and detailed profiles are presented for an acetylene-oxygen flame at 2.5 mm Hg. The ion CHO+ peaks ahead of C3H3+ which precedes H2O+. Many other ions are observed to peak at about the same position in the flame as C3H3+. There are still problems, however, with respect to interpreting the results in terms of the first ion produced from neutral species and the sequence of ion molecule reactions which follows." @default.
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- W2038662972 date "1963-01-01" @default.
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- W2038662972 title "Ion and electron profiles in flames" @default.
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- W2038662972 doi "https://doi.org/10.1016/s0082-0784(63)80071-5" @default.
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