Voyager DP-263-S Guía de usuario Pagina 422

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Chapter 7 PSD Analysis
7-18 PerSeptive Biosystems
7
Differences from
regular analysis
When operating in PSD mode, note the following differences
from analysis in non-PSD mode:
Higher laser intensity—In non-PSD mode, you use a
laser intensity that yields acceptable performance without
fragmentation. You need a higher laser intensity to
generate PSD fragments.
Higher Grid Voltage% and shorter Delay Time—A
higher Grid Voltage% and shorter Delay Time generates
a sharper ion packet at the position of the Precursor Ion
Selector, and improves fragment ion resolution.
Sample consumed more quickly—Higher laser
intensities ionize and consume sample more quickly than
lower laser intensities used in non-PSD mode.
Different calibration used—PSD analysis uses a
different calibration function to correctly determine the
masses of PSD fragment ions. For information, see
Section 7.1.4, Mass Calculation for Fragment Ions.
Acquisition of multiple spectra at different Mirror
Ratio settings to create a single composite
spectrum—To correctly focus fragments with different
mass ranges, collect PSD segment spectra with different
Mirror Ratio settings. The Data Explorer software
“stitches” the segments together to create a composite
spectrum. For information, see the
Data Explorer
Software User’s Guide
, Chapter 8, Viewing
Voyager PSD Data.
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