3
OMNICxi Software Operation
Acquire and Analyze Data
Thermo Scientific
DXRxi User Guide
139
Peak Position Profile Settings
The Peak position profile shows the shift in the location of a specified peak along the X-axis.
The measurement is based on the peak maximum in a specified region for each sample point
in the chemical image. The colors and their associated X-axis values in the profile intensity
scale indicate the relative locations of the peak maximum in the specified region.
Figure 83.
Peak position profile settings
Table 31.
Peak width profile settings
Profile Type
Description
Area start/end
Defines the location of the peak of interest. To specify the peak position,
select the
Spectrum tool
, then click a point of interest in the chemical
image. The spectrum collected at that location is displayed in the spectral
pane. Enter X-axis start and end locations in their respective boxes or drag
the left and right facing triangle tools in the spectral pane to mark the
peak start and end.
Tip:
To zoom the spectrum, use the mouse to draw a box around the
region, then click inside the box.
Baseline
start/end
Defines baseline values for the specified area. Enter X-axis locations in the
Baseline start
and
Baseline end
boxes or drag the two single triangle tools
in the spectral pane (see image above) to mark the baseline points.
Height
Specifies the height of the peak where the width measurement is to be
made. For example, selecting 50% will measure the width at one half of
the peak height resulting in a full width half max (FWHM) measurement.
Intensity
threshold
Specifies a peak height value below which this profile will report 0. This
eliminates peaks below a certain size to prevent reporting noise when the
peak of interest is not present in the spectra.
Summary of Contents for DXR xi
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