The α-SDA is designed as a compact, round block with input/output ports to assure a problem-free combination with the electron optical system. Although it has been conceived as a central element of a novel DEEM spectromicroscope, its modular construction enables adaptation to other surface science methods. Thereby, an input/output mechanical access is arranged in the external holding plates of α-SDA analyzer for the unproblematic coupling by means of the ring adapters to the existing LEEM, PEEM or even TEM systems. The mechanical design satisfies ultrahigh vacuum requirements: the electron optical elements are fabricated of aluminium bronze and titanium, electrical insulations are realized by a usage of polished aluminium oxide and connectors are made of kapton wires. As seen from the photograph, an assembled α-SDA filter has the form of a round block that consists of two identical insulated and complementary “hemispheres”, enclosed between lower and upper holding plates. The outer plates as well as the magnetic deflector are kept at the potential of the central electron trajectory of the α-SDA imaging filter. The ceramic insulation is sufficient to make the whole unit float (if necessary) even at five kilovolts. In order to reach the highest energy resolution (e.g. by setting a pass energy much below 100eV), an α-SDA filter is surrounded by a MuMetal shield (not shown in the image). As a consequence, mechanical access to the α-SDA (required for the adjustment of the dispersion aperture) is handicapped- thereby a special piezoelectrically driven aperture mechanism has been developed for a reproducible and precise continuous slit adjustment up to 750µm.


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The all electron optical elements of the DEEM Spectromicroscope are fabricated of the ultrahigh vacuum materials like titanium, molybdenum, vacuum bronze, ceramics, macor etc. by the Metob CNC Centre, picture below:



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