M88-E01072 8 - 1
8. Alignment
Peak position is determined during calibration
(see Section 7), not during alignment. The align-
ment optimizes the resolution of the detector.
The resolution is determined by finding the best
possible FWHM (Full Width Half Maximum). The
resolution is dependent on the measuring circle
and the alignment of the detector mount.
8.1 Alignment of the VÅNTEC-1
Detector and Mount
Complete a coarse alignment of the 2 DOF
mount by running repeated PSD fixed scans of
NIST SRM 1976 or Quartz. For a quick assess-
ment of the alignment, compare the intensities
of the main (104) peak to the valley between
Kα
1
and Kα
2
(see the example in Figure 8.1).
[Example: The first scan’s intensity of the valley
is 4,000 cps. The main peak’s intensity is 8,000
cps. This represents a ratio of 2 (4,000:8,000 =
1:2)]. A ratio of 3.0 to 4.0 is desired. Once the
max ratio is achieved, proceed to Section 8.2.
1. Run a PSD fixed scan. Use a standard ref-
erence material of the NIST SRM 1976
Corundum plate (104) or Quartz (101)
reflection. Use the parameters in Table 8.1
for SRM 1976.
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