Chapter
8
Analyzer Checks
8.1 Independence of Peak Position with Pass Energy
Because of the large number of slit and lens combinations, the energy calibration of the
analyzer was not done for each slit combination. SPECS delivers the analyzer with the
correct parameters for the common slit combinations. To check the independence of
the peak position with pass energy for a desired slit combination please follow the pro-
cedure below:
Transfer a silver sample into the system. Warm up your electronics first!
Adjustments:
Excitation
Mg K
α
X-ray power
100 W
Slit
desired slit combination, e.g. entrance: largest slit / exit: open
Mode
Medium Area
Binding energy range 365 - 375 eV
Scan
1
Dwell Time
100 msec
Energy step
25 - 30 meV
Pass energy
~ 15eV
Run a spectrum. Set a second pass energy (for the above described slit combination e.g.
of about ~5 eV). Repeat the measurement. Compare the spectra. If the voltages are cor-
rect, the peak-maxima of both spectra have to have the same energy. The peak posi-
tions of both spectra should not differ by more than 100 meV. For a symmetrical peak
the peak position is independent of E
pass
. This is not true for Auger electron peaks since
the peaks are intrinsically asymmetrical.
You can also display the single channels for the accumulated spectra. The difference in
the peak maxima for each channel indicates the quality of the MCD Calibration (see sec-
tion 7.3). If the peak energy weakly depends on pass energy, perform the “MCD Calib-
ration” (see section 7.3, page 60). If the calibration does not fix the problem and/or
there is a strong dependence please refer to section “” on page . Short circuits or sup-
ply failure can cause such behavior. After voltage check please contact SPECS and send
some spectra as well as the measured voltages to help diagnosis of the exact problem.
Note that there is a weak dependence of the peak energy on beam position at the
sample and the size of the illuminated area. Because SPECS calibrates the analyzer with
65
Summary of Contents for PHOIBOS 100
Page 1: ...PHOIBOS Hemispherical Energy Analyzer Series PHOIBOS 100 PHOIBOS 150 3 1...
Page 6: ...Table of Contents PHOIBOS...
Page 10: ...Introduction 4 PHOIBOS...
Page 13: ...Electrical Connections Figure 2 Connection Scheme PHOIBOS 7...
Page 14: ...Components and Connections Figure 3 Analyzer Housing PHOIBOS100 8 PHOIBOS...
Page 15: ...Electrical Connections Figure 4 Analyzer Housing PHOIBOS150 PHOIBOS 9...
Page 42: ......
Page 51: ...SpecsLab Hardware and Software Installation PHOIBOS 45...
Page 52: ......
Page 62: ......
Page 78: ...Analyzer Checks Figure 33 Schematics of the 12 pin Analyzer Feedthrough 72 PHOIBOS...
Page 80: ......
Page 86: ......
Page 92: ...List of Figures Figure 39 Alignment Pin 84 II PHOIBOS...
Page 93: ...List of Figures PHOIBOS III...
Page 94: ......
Page 96: ......
Page 98: ...Index PHOIBOS...
