Einfluß der Geschwindigkeit von Edelgasionen auf die Emission von Sekundär-Elektronen

Abstract

By direct comparison of the signals of a particle multiplier and a Faraday cage at the collector end of a mass spectrometer, the secondary emission coefficients of a copper-berilium alloy were determined for single and multiply charged noble gas ions. The ions involved were He+ and He2+, 20Ne+ up to 20Ne3+, 22Ne+, Ar+ up to Ar5+, Kr+ up to Kr7+ and Xe+ up to Xe9+. The energy of the ions varied between 3 and 90 keV. The secondary emission factors show an almost exact linear dependence on the velocity of the ions, with a threshold at 5.5 × 106 cm/s. The slopes are proportional to the square roots of the ion masses.