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Peak Detection
Data Explorer
™
Software User’s Guide 3-27
3
Charge State Determination (Spectrum only)
Maximum Charge
State
Determines the peak spacing evaluated for the presence of
isotope peaks. The expected peak spacing is determined by
the Max Charge State plus or minus a tolerance value. The
tolerance is calculated as (proton mass/charge state) × 15%.
For example, with a Max Charge State of 3, the software
checks for peaks that are 0.33 m/z apart, with a fixed
tolerance of 0.05 m/z, where proton mass equals
1.007276456. Maximum Charge State is 6 for Mariner data
and 1 for Voyager data.
Maximum Isotopes # Specifies the maximum number of peaks included in an
isotope cluster.
NOTE: Setting this value too low can result in peaks not
being included in the appropriate isotope cluster. For more
information, see “Max Isotope # set too low” on page 3-35.
Minimum and
Maximum Intensity%
Specifies the intensity range that a peak must fall within
(relative to the previously evaluated higher mass peak) to be
included in the current isotope cluster.
Table 3-3 Peak Processing Parameters (Spectrum Data Only) (Continued)
Parameter Description