| Peak List |
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| 2. Select Enable Peak List Filter, then select: |
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Filter Type | Description |
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Monoisotopic | Labels the peak of the lowest detected mass in an isotope |
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| envelope. Before applying filtering, set the values in Peak |
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| Processing detection parameters to accurately detect and label all |
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| peaks in the isotope envelope with the correct charge state. If the |
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| parameters are not correctly set to yield correct charge states for |
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| all peaks, the monoisotopic peak may not be correctly labeled. |
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| See Section 3.2.5, Charge State Determination and Examples, for |
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| more information on setting parameters. |
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| Monoisotopic filtering is useful on isotope clusters where the |
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| approximate elemental composition and isotopic ratios are not |
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| known, for example, in PSD analysis (where the precursor ion |
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| filtering enhances the precursor ion isotope intensity relative to the |
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| rest of the cluster), or in a spectrum that contains molecules with |
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| very different elemental compositions. |
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| For most applications, especially peptide analysis, the deisotoping |
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| function yields more accurate results than monoisotopic peak |
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| filtering. See Section 3.4, Deisotoping a Spectrum. |
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Charge State | Labels the peaks with the selected charge state (z). If you select a |
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| charge state of 0, the software displays mass labels only on peaks |
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| for which the software could not determine a charge state. |
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| CAUTION: A zero value in the Spec Peak list does not indicate a |
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| charge state of zero. It indicates that the software could not |
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| determine the charge state. |
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Data Explorer™ Software User’s Guide |