
Chapter 6 Acquiring Mass Spectra
6-6 PerSeptive Biosystems
6
• Observe the Spectrum window or Oscilloscope screen to
determine if data is acceptable. See Section 4.3, Using
the Spectrum Window, or Appendix I, Using the
Oscilloscope and Control Stick, for more information.
Obtaining
acceptable data
The quality of the data you acquire is directly affected by:
• Ionization properties of the sample
• Sample preparation, discussed in Section 3.1, Preparing
Samples
• Laser intensity
• Laser position on the sample
• Acquisition instrument settings
It may take some practice before you observe spectra that are
acceptable for your analyses.
For examples of acceptable data and guidelines for obtaining
acceptable data, refer to Section 6.3, Obtaining Good Spectra
in Delayed Extraction Mode.
Obtaining
maximum mass
accuracy
For maximum mass accuracy, note the following:
• Acquire at least six replicates of each sample for a
statistically significant sampling of data.
• Collect at least 50 shots of data (determined by the
Shots/Spectrum parameter in the Instrument Settings
control page).
• Set %Centroid at 50% for most applications. Centroid% is
described in the
Data Explorer Software User’s Guide,
Section 5.5, Centroiding.
Comentarios a estos manuales