Analyzing Samples
34
Agilent 5500 Series FTIR Operation Manual
The triple reflection ATR is most suitable for liquid samples with
lower IR absorption properties. The triple reflection ATR has a 2 mm
diameter sampling surface with 200
μ
m active area and provides
approximately 6 micron effective penetration depth for IR energy at
1700 cm
-1
. The triple reflection ATR is mounted flush with the metal
mounting plate and does not operate with a sample press device.
The nine reflection ATR is most suitable for the most demanding
liquid samples with the lowest IR absorption properties. The nine
reflection ATR has the largest sampling surface (6 mm diameter)
with 2 mm active area and provides approximately 12 microns of
effective penetration depth for IR energy at 1700 cm
-1
. The nine
reflection ATR is slightly recessed into the mounting plate and does
not operate with a sample press device. It is, however, designed to
accommodate an optional flow cell attachment.
CAUTION
Although diamond is a very hard material, the ATR window is relatively thin
(0.5 mm or less) and can crack under extreme pressure conditions. Ensure that
the sample makes contact with the entire surface area of the diamond and not
just a point within the diamond. Avoid the use of the sample press on samples
that may be sharp or pointed.
In the sample loading and cleaning mode, the sample press should be
in the highest position, so the sample press tip is well above the
diamond window sampling surface (see Figure 7). It is in this
position that the sample mounting area can be easily accessed for
loading the sample into place and for cleaning the sampling surfaces
before the next sample is analyzed.
NOTE
Only the single reflection ATR version has a sample press device.
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