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Photo electron spectrometer


The experimental station of this beamline is an angle integrated photoelectron spectrometer, which was also designed and fabricated indigenously. It consists of (i) an energy analyzer, (ii) an experimental chamber with in situ heating and cooling arrangement, (iii) preparation chamber equipped with magnetic sample transfer rod, ion gun and diamond file scrapper, and (iv) the associated electronics with data acquisition system. The energy analyser consists of an electrostatic lens, a hemispherical analyser and a detector. The lens is a three-piece cylindrical system. Each cylinder is machined out of stainless steel and mirror-polished and coated with gold for good transmission of beam. The inner and outer hemispheres of the analyser are machined out of aluminum to an accuracy better than ± 0.001 mm. The surfaces are then polished and coated with gold. The hemispheres are mounted on a fringe plate which is also machined out of aluminum. It has an entrance and an exit slit whose width can be varied from 1 mm to 3 mm in steps of 1 mm. The entire analyser assembly is mounted such that the inner hemisphere, the outer hemisphere and the fringe plate are isolated from each other by using teflon washers and bushes. There are six concentric rings made out of stainless steel mounted on fringe plate to correct the fringe field and improve the resolution of the analyser. These rings are positioned equidistantly in the gap between the two hemispheres. The inner and outer hemispheres have a radii of 65 mm and 125 mm respectively. A channel electron multiplier is used as a detector which is mounted at the end of the exit slit of the analyser.


Valence band spectrum of Cu along with theoretical density of states (dashed line).
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