ACM 150
129
Evaluating/resolving spectral balance
You evaluate the spectral balance using a Background spectrum. A Background
spectrum is provided in “Acquire Background”
Figure 68.
It should look like
Figure
78
, having the same overall shape and peaks.
Figure 78. Correct background spectrum
Figure 79. Problem Background Spectrum
1.
Compare your Background spectrum to the spectrum shown in
Figure 78
.
Note the intensity of region A (2000 cm
-1
) and region B (4000 cm
-1
)
2.
The intensity at region B should be at least 20% of the intensity at region A. If
it is 20% or higher, the spectrum is balanced. If less than 20%, the spectrum is
imbalanced and It has an inadequate S/N in region B. This is resolved by cleaning
(or replacing) the gas cell and/or by improving alignment.
3.
Follow the instructions in
Servicing the gas cell
.
Содержание ACM 150
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