Estimation of C2 and C3 hydrocarbon production yields of graphite due to hydrogen ion bombardment

Abstract

A numerical method is proposed for estimating the production yields of C₂ and C₃ hydrocarbons, which are generated by bombarding graphite with hydrogen ions, from signal intensities of a quadrupole mass spectrometer (QMS). It is shown that the C₂H₂, C₂H₄, C₂H₆, C₃H₄, C₃H₆, and C₃H₈ production yields can be easily estimated by fitting the calculated intensities of QMS signals, by means of summing up the crackings of species, to the measured ones, whose masses range between 24 and 44. The derived formulas can uniquely determine the yields, using the measured data of the cracking coefficients and sensitivities of purified standard gases for the QMS as well as of the intensities of QMS signals.