AVS 46th International Symposium
    Applied Surface Science Division Tuesday Sessions
       Session AS-TuP

Paper AS-TuP18
A Dual Anode Monochromatic X-ray Source

Tuesday, October 26, 1999, 5:30 pm, Room 4C

Session: Poster Session
Presenter: S.C. Page, Kratos Analytical, UK
Authors: S.C. Page, Kratos Analytical, UK
C.J. Blomfield, Kratos Analytical, UK
B.J. Tielsch, Kratos Analytical, UK
D.J. Surman, Kratos Analytical, UK
Correspondent: Click to Email
High energy Ag L@alpha@ X-rays have several advantages over the more commonly employed Al K@alpha@ source. A photon energy of 2984.3eV means that a Ag source can generate higher energy core levels, Auger series and has a greater excitation volume. A further advantage over other high energy sources is that the Bragg condition may be satisfied via a second order diffraction within the confines of the conventional Al K@alpha@ monochromator body with only minor modifications. We have now for the first time implemented a Ag monochromator as a modification to the standard Al monochromator on a modern magnetic lens based electron spectrometer, the Axis Ultra. The anode of the Al monochromator has been adapted to have both a conventional Al face as well as an additional Ag face, thus changes between source may be made by minor adjustment without breaking vacuum. The great improvement gained in photoelectron collection efficiency by employing magnetic lens technology improves the sensitivity and ultimate usability of the Ag source making it a viable alternative for the measurement of deep 1s core levels and Auger parameters. The results presented show the performance of the Ag source to give resolution better than 0.9 eV FWHM on Ag and a sensitivity greater than 4,300 CPS on Au at a resolution of 1.3eV. Further results highlighting the usefulness of the source on practical samples will be presented.