
Exploring PSD Mode
Voyager
™
Biospectrometry
™
Workstation User’s Guide 7-45
7
By fine-tuning the Grid Voltage%, you can alter the point of
initial time focus of the ions, which decreases the amount of
time the ion spends defocusing. This allows you to balance the
defocusing time with the refocusing time in the reflector
(Figure 7-15).
The goal in optimizing the Grid Voltage% is to find a suitable
setting that optimizes resolution in the middle of the mass
range of interest. Notice that as you bring lower mass ions into
focus, you compromise the focus of higher mass ions.
Figure 7-15 Increased Grid Voltage% and Ion Focusing
Point of initial focus
moved farther down
flight tube by increased
Grid Voltage%
From source
Acceptably focused higher mass ion
Acceptably focused lower mass ion
Focused mid-mass ion
6 µsec
8 µsec
8 µsec
8 µsec
10 µsec
8 µsec
Flight tube
Reflector
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