
The group is currently setting up various components of an
EELS system in the laboratory. The system consists of three m-metal
chambers, independently pumped by turbomolecular pumps and cryopumps,
connected by the use of valves. The main chamber is equipped with
an ARUPS10 hemispherical electron analyser and a UVL-HI Helium discharge
lamp, manufactured by
VG Scientific. The analyser is situated on a two axis goniometer
and is capable of almost a full 360° rotation in the horizontal
plane and more than 90° out of the horizontal. It offers an
angular resolution in the range of 0.2-2.0° in an energy range
of 0.5-2.5 keV. The helium lamp provides two main energy lines at
21.2 eV and 40.8 eV. Another available excitation source is an Electron
Monochromator Unit, EMU50, manufactured by VG Microtech. Sample
manipulation is done with an Omniax manipulator capable of three
translational and one rotational degrees of freedom, fitted with
a Janis cryostat
of temperature range 4-325 K. The prep chamber is equipped with
a heater, an argon ion sputter gun and a wobblestick for in-situ
sample cleavage and preparation.
|