TEARES: Toroidal energy- and angle-resolved electron spectrometer: Results and progress to date

In order to keep up with the large improvements in synchrotron radiation, we have developed a toroidal-based electron spectrometer capable of collecting electrons emitted over a large angular range, whilst preserving emission direction information. This system has an analyser defined by spherical radius of 125 mm, cylindrical radius of 120 mm, sector angle of 142degrees, and useable azimuthal angle of similar to230degrees. A 1 mm high analyser entrance slit provides a theoretical analyser resolution (DeltaE/PE) of 0.0081. The spectrometer has no blind spots and incorporates a working distance defined by a similar to40 mm radius. It operates over the kinetic energy range < 0.5 to 1000 eV and a pass energy range of similar to0.5 to 25 eV. This system represents an enormous advance over other more typical spectrometers, (e.g. hemispherical), as the solid acceptance angle is up to two orders of magnitude greater.