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*   Spectral Tree Node Items
Some mass spectrometry techniques can generate spectra whose appearance depends on the experimental conditions and sample preparation. To manage and search diverse product spectra with an identical precursor ion for a single chemical entity, the Mass Frontier application uses spectral trees that can contain nodes with several node items. The node item stands for any product or calculated spectrum of an identical precursor m/z value or m/z range (node spectra), or for a chromatogram.
Node product spectra represent spectra that were acquired at various collision energies and isolation widths or that use wideband activation. They can also be zoom spectra, source CID spectra, or any other spectra that enhance reproducibility in compound identification. If a node contains more than two parallel spectra, the application automatically calculates the average and composite spectra. In addition to spectra, each node can contain a chromatogram.
You might use node spectra for any of these reasons:
The spectral node strategy strengthens the robustness of all the mathematical processing methods and, compared to simple spectra averaging, does not distort the highly nonlinear peak ratio progress.
You can easily access node spectra from a library and create or edit them using the graphical interface. Every tree item has an editable annotation caption.
You can select node items by clicking the edge of the spectral or chromatographic node item, or by browsing in the box displayed below the tree.


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Related Topics:
  Spectral Tree Window
  Generating a Spectral Tree
  Copying and Pasting a Spectral Tree
  Searching Spectral Trees
  Spectral Tree Chromatograms
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