Abstract

A method and an experimental setup have been developed for measuring absolute photoemission cross sections for electron-impact-induced line radiation in the vacuum ultraviolet (VUV). Unparalleled low uncertainties for the cross sections were achieved mainly from the use of the Berlin electron storage ring as a primary standard source in the VUV for the determination of the responsivity of the spectrometer–detector system used and from the use of a spinning rotor gauge as a secondary standard for the determination of the target gas density. As the first result we present a photoemission cross section for the Ar ii 3s3p6 2S1/2–3s23p5 2P3/2 transition at 91.98 nm for 2-keV electron-impact energy of 1.167 × 10−18 cm2 with a relative uncertainty of 4.4% ( 3σ value). This low uncertainty demonstrates the suitability of the setup for further cross-section measurements.

© 1995 Optical Society of America

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