Abstract
Design and operational characteristics of a line source with very high intensity in the vacuum UV are described. The source generates rare-gas resonance radiation in a low-pressure, cold-cathode, DC glow discharge up to 200 mA. The windowless lamp is differentially pumped and can be installed inside a vacuum chamber. During operation it is water cooled and can be mildly baked because it contains metal seals only. In a light beam of 2.5 mm diameter the photon flux for the strongest HeI and NeI emission line has been measured to be nearly 1013s-1and one order of magnitude less for the strongest HeII, NeII and ArI lines. The photon intensities obtained are compared with values from the literature. The lamp has been used to investigate atomic and molecular photoionisation simultaneously resolved with respect to photon and electron energy, electron emission angle, and spin. To show the performance, angular-distribution results of photoelectron intensities for nitrogen molecules (X2 Sigma g+, A2 Pi u, B2 Sigma u+) at 58.43 nm are presented.
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