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3
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ME12044A
3.
CONFIGURATION
The R-XAS Looper is composed of two sections: the spectrometer section, which selects monochromatic
X-rays by applying spectrometry to the continuous X-rays emitted from an X-ray generator, and the
sample section, in which the intensity of X-rays transmitting through the sample (or emitted from the
sample) is measured and the intensity of incident X-rays is monitored at the same time. The left-hand part
of the illustration in Figure 3.1 represents the spectrometer section, while the smaller chamber on the right
side is the sample section.
Figure 3.1 View with the Cover Opened (D010524A02)
The spectrometer section is consisted an X-ray generator, spectrometer (goniometer), divergence slit,
receiving slit, and monochromator (Figure 3.2). The X-ray generator is a fixed-target tube of 3 kW. The
spectrometer adopts the so-called “Linear spectrometer” method, which employs stepping motors to exert
control such that the distance from the X-ray source to the monochromator crystal and the distance from
the monochromator crystal to the receiving slit remain equal, thereby allowing X-rays of any desired
energy level can be selected. The divergence slit (DS) and the receiving slit (RS) are variable slits driven
by stepping motors, with their width controlled from a computer. The monochromator is provided with the
three axes, namely of
ω
, tilt, and Z. A Johann- or Johannson-type monochromator crystal with a Rowland
circle radius of 320 mm is mounted on the monochromator, which is then controlled from a computer.
