The addition of H2 to an Ar plasma studied by fast flow glow discharge mass spectrometry (FFGD-MS): mechanism and relative sensitivities†
Abstract
Changes in steel and copper cathode ion intensities from the afterglow of a fast flow dc glow discharge (FFGD) have been studied as a function of the amount of H2 added downstream from the active discharge region. The signals from the majority of different elements increased, although some analytes were actually quenched. In general, the data were qualitatively similar to previous ‘hydrogen effect’ studies using conventional ‘static gas’ GD source designs. Here variations in the size of the effect are reported as hydrogen concentration, plasma density, interaction time and ion