Axis BTA 2100D Manuale dell'Operatore Pagina 214

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level of parent or product ions in the analytical scan results in consistent,
reproducible product ion spectra.
Lower target values may be required with the MS/MS option to prevent space
charging effects. Based on the isolated parent ion, the following target values are
recommended.
Parent Ion Target
60 m/z 150
10000
150 m/z 500
5000
500 m/z 650
2000
Additionally, the EI-Auto PreScan ionization time must be changed from the
default value. This is done automatically when the user selects MS/MS ion prep.
The PreScan ionization time is changed to 1500 µsec.
The MS/MS Ion Prep Method
MS/MS Software Parameters
Under the Isolation header, enter the Parent Ion Mass (m/z). The parent ion
mass range is 50 to 650 m/z.
NOTE: Integer mass values may be used if the mass isolation window (next
step) is greater than 1.5 m/z. If the window size is less than 1.5 m/z, or if the
mass defect of the parent ion is greater than approximately 0.3 m/z, use the
exact fractional mass.
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