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Monochromatic Ag X-ray Source |
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Written by Adam Roberts
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Thursday, 23 November 2006 15:30 |
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Page 1 of 4 Introduction
High energy silver (AgLα) X-rays have several advantages over those produced by the more commonly employed aluminum (AlKα) source. A photon energy of 2984.3eV means that a silver source can generate  higher energy core levels and Auger series, and has a greater excitation volume. A further advantage over other high energy sources is that the condition for Bragg "reflection" (Bragg's Law) of the silver Lα line is satisfied via second order diffraction within the confines of the conventional AlKα monochromator body, with only minor modifications.
We have now for the first time implemented a silver monochromator as a modification to the standard aluminum monochromator on a modern magnetic lens based electron spectrometer, the Axis ULTRA. The anode of the aluminum monochromator has been adapted to have both a conventional Al (metal) face and an additional Ag face, thus a changeover from one source to the other may be made with only minor adjustment and without breaking vacuum. The great improvement gained in photoelectron collection efficiency by employing magnetic lens technology improves the sensitivity and ultimate usability of the silver source making it a viable alternative for the measurement of deep 1s core levels and Auger parameters.
The results presented here show that the silver source gives a resolution better than 0.9 eV FWHM for a silver sample and a sensitivity greater than 4,300 CPS on gold at a resolution of 1.3eV.
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Last Updated on Wednesday, 29 November 2006 17:46 |
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