Über den Einfluß der Adsorption auf die Feldionisierung organischer Substanzen

Abstract

The dependence of neutral particle supply to the emission centres of a field ion emitter on adsorption and surface diffusion is investigated. An equation is derived relating the field ion current to the adsorption energy of organic adsorbates. It follows from this equation that the ion current increases with increasing adsorption energy. This was confirmed experimentally by a set of seven heptane isomers where the ion current increases with increasing boiling points. The ion intensities of a series of n-paraffins as a function of molecular weights are also discussed.