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Thermo Fisher Scientific

Apply Profiles

The profile settings define the mathematical algorithm applied to each spectrum in the measurement, including the selected regions or points, to create a chemical image. The algorithm converts each spectrum into a number that is represented by a color in the chemical image.

To apply profiles

You can select a default profile before you begin a session and you can quickly change profiles after measuring data.

  • Before you start your session, select a profile from the Profiles list on the dashboard. This is the profile first displayed after measuring areas, lines, or points.

  • After measuring areas, lines, or points, select the Profiles tab and choose an option from the Profile type list. Click Update to apply the changes.

The available profile types are described below.

Profile Description
Correlation

The Correlation profile shows the correlation between each sample point in the chemical image and the selected correlation spectrum.

Each color in the profile intensity scale represents the degree of correlation with the correlation spectrum.

Area

The Peak Area profile shows the corrected area of the specified peak for each sample point in the chemical image. The colors in the chemical image represent the relative area of the specified peak at each sample point. A higher intensity value (closer to the top of the profile intensity scale) indicates a larger peak area.

Peak

The Peak profile shows the corrected height of the specified peak for each sample point in the chemical image. The colors in the chemical image represent the relative intensity of the specified peak at each sample point. A higher intensity value (closer to the top of the profile intensity scale) indicates a larger peak.

Area Ratio

The Peak Area Ratio profile shows the ratio of the corrected areas of two specified peaks for each sample point in the chemical image. Using the ratio of two peaks lets you look at:

  • Changes in sample material (some peaks will increase while others may decrease)

  • Changes in two sample components

  • Changes in peak area normalized against another peak to make sure physical variations (focus for example) are not causing variations in measured peak area

  • Information about the number of layers present and the quality of the materials in a layered sample such as graphene

The colors in the chemical image represent the relative ratioed areas of the specified peaks. A higher intensity value (closer to the top of the profile intensity scale) indicates a larger peak area ratio.

Peak Ratio

The Peak Height Ratio profile shows the ratio of the corrected heights of two specified peaks for each sample point in the chemical image. The colors in the chemical image represent the relative ratioed heights of the specified peaks. A higher intensity value (closer to the top of the profile intensity scale) indicates a larger peak height ratio.

Chemigram

The Chemigram profile shows the uncorrected area of the specified region for each sample point in the chemical image. The colors in the chemical image represent the relative area under the specified region at each sample point. A higher intensity value (closer to the top of the profile intensity scale) indicates a larger peak area.

Peak position

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.

Peak Width

The Peak Width profile shows the width of the specified peak for each sample point in the chemical image. The measurement is based on the full width of the peak at the specified height. The colors in the chemical image represent the relative width of the specified peak at each sample point. A higher intensity value (closer to the top of the profile intensity scale) indicates a wider peak.

MCR

The MCR profile finds components in the sample data based on their (calculated) pure component spectra and shows their locations in the chemical image.

Favorite and session profiles

You can save your profile settings to your favorite or your session profiles.

  • Favorites are saved for use with all of your future sessions. For example, if you frequently use a peak position profile that uses the same peak location, you can save the profile with that peak location to your favorites so that you do not have to specify the position every time you use the profile.
  • Session profiles are saved only with the session data. When you open the session in the future, your profile settings will still be present, but they will not be available during other sessions. This is useful when you want to save profile settings with a particular session, but you do not expect to use the settings regularly.

❖ To save your profile settings

  1. In the Profiles tab, select a profile type and set your preferred options.
  2. Enter a name and click Save
  3. To move a Favorite profile to your session profiles, on the Favorites tab, select the profile and click Save to session.
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