Voyager DP-263-S Betriebsanweisung Seite 46

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Chapter 1 Introducing the Voyager™ Biospectrometry™ Workstations
1-16 PerSeptive Biosystems
1
Figure 1-10 Velocity Focusing of Ions in Linear Mode
—Detection
Reflector mode
In Reflector mode, ions are velocity-focused at the exit of the
ion source instead of at the detector. By tuning the
variable-voltage grid and the acceleration delay time, you can
alter the point at which ions are focused, and enhance
resolution. This initial focus is refocused by the reflector, which
you can tune for second-order velocity focusing.
Detector
Voltage (
U
)
+
+
Detection
Extraction delay and the
magnitude of the extraction pulse
can set that ions of a given mass-
to-charge ratio with different initial
velocity reach the detector exactly
at the same time.
slow
fast
t
=
t
PB100773
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