Abstract:
An ion source in which gas is ionized by an electron beam in an ionizing space between a narrow extraction gap in an extraction electrode and an inner wall of a repeller electrode; the wall extending substantially parallel to the extraction gap with the open side of the wall facing the gap. The ions are drawn out of the ionizing space through an extraction electrode along electric fields produced by an acclerating electrode. The repeller electrode has a concave-shaped form for making the effective electric field of the ionizing space substantially independent of the accelerating voltage, thereby resulting in high extraction efficiencies.
Abstract:
A mass spectrometer of the sector type which can be changed to an ionization manometer in which the ion collector current is a measure of the overall pressure of the gas to be analyzed utilizes a supply circuit for the system of accelerating electrodes in the ion source. The supply circuit provides the system of accelerating electrodes with a constant voltage or a pulsatory voltage in accordance with use as a mass spectrometer or an ionization manometer respectively.