Mass Spectrometric Study on Adsorption of Water Vapor on a Graphite Surface

概要

論文の詳細を見る
Peak shapes in mass spectra obtained by voltage scanning using a mass spectrometer with such a modified ionization chamber as that described above are characterized by the places of formation and the initial kinetic energy of the ions. Thus, from the shape of the peak, one may be able to decide the place of formation of the ions and, though not so precisely, to estimate their initial kinetic energy. When the method was applied to the ions formed by electron bombardment at a graphite surface covered with adsorbed water vapor, it was found that (1) H2O+ and HO+ were formed from residual or desorbed H2O only in the gas phase, (2) H2+, H+ and CO+ were formed both on the surface and in the gas phase, and (3) H+ which formed on the surface had the initial kinetic energy of about 10 V. These results will confirm the fact that the adsorbed water molecule is dissociated into adsorbed H2 and surface oxide of carbon that probably takes a configuration such that CO is adsorbed on the surface.
社団法人日本化学会の論文