We are in the process of developing a new hemispherical spectrograph
for use in high resolution zero-degree Auger projectile spectroscopy
[1]. Recently, the performance of our spectrograph
operating in low resolution mode was reported [2] for
measurements of projectile Auger electrons at zero-degrees to the
beam direction.
First attempts to run the spectrograph in high resolution mode
by measuring the well known 
Resonance Transfer and Excitation
(RTE) line were reported in [3].
In this paper we report on further high resolution tests of our apparatus
in which the electrons are decelerated prior to energy analysis
to improve the overall energy resolution. Thus we test the energy resolution and the
invariance of the single differential cross section (SDCS) for various projectile
Auger lines as a function of the deceleration factor.