MEASUREMENTS OF IONIZATION CROSS-SECTIONS OF 4D-ELECTRONS IN XENON BYELECTRON-IMPACT

Partial ionization cross sections for 4d-electrons in xenon by electro n impact have been measured by means of a combination of the electron- energy-loss spectroscopy and the Auger electron spectroscopy in the im pact energy region from 70 eV to 4 keV. The cross sections increase wi th the impact energy rapidly from the threshold and display a sharp ma ximum, whose value is (17.0+/-3.5) x 10(-18) cm2, around 120 eV impact energy, revealing an existence of a resonance. The cross sections ari se again from a minimu m at about 200 eV and exhibit a broad maximum o f (14.5+/-3.0) x 10(-18) cm2 around 500 eV. Absolute scale of the cros s section is determined using the generalized oscillator strengths for the 4d-ionization, which are measured by the electron-energy-loss spe ctroscopy. Relative cross sections are measured as a function of the i mpact energy using an Auger line assigned to the N5O2,3O2,3 (S-1(0)) f ine. Experimental results are compared with a previous experimental re sult given by a different procedure and a result of a theoretical calc ulation.