Possible Problems
spheres shifted, MCD shifted.
improper adjustment of
Slit Orbit mechanism
check proper adjustment section 3.4
Table 6: Low Intensity
possible cause perform check, test, or troubleshooting
procedure no. →
chemical peak broadening sputter cleaning / replace anode
lateral inhomogeneous charging of the
sample
use charge compensation by means of elec-
tron flood gun
noise or/and ripple on the following
voltages: sample, spectrometer voltage
U0, detector voltage, electrode voltages
of the analyzer
ground sample and check hum and ripple
check the ground connection of all the power
supplies → section 4.7
magnetic fields in the region of the
spheres
measure magnetic field
preamplifier setting changed check preamp setting section → 3.5.3
lens system and HSA out of focus
check lens and HSA electrodes →
section 8.4 and voltages section
detector supply voltage incorrect check detector supply voltages
→section
carbon coating of HSA spheres
damaged
open HSA and check -
do this only if all other checks are negative
Humming and ripple on the following
parts: sample, spectrometer voltages,
multiplier voltage, lens voltage
ground sample, check humming and ripple
Table 7: Low Energy Resolution
possible cause perform check, test, or troubleshooting
procedure no. →
workfunction setting incorrect Check the work function setting, section 7.4 .
sample charging Check the sample ground connection. Use ex-
ternal electron flood gun to compensate for
the charging.
voltages of the HSA (inner and outer
sphere) are incorrect
In similar spectra with different pass energies
the peaks are shifted. Check has voltages →
section 8.4
zero point drift of the spectrometer
check zero point of HSA3500 →section
PHOIBOS 53
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