
MALDI-TOF MS Technology Overview
Voyager
™
Biospectrometry
™
Workstation User’s Guide 1-9
1
For acquiring TOF spectra, time measurement starts:
• Delayed Extraction mode—Measurement of the ion
signal starts when the extraction pulse is applied. The
time at which the extraction pulse is applied is
user-settable. See Section 1.4, Voyager-DE™ (Delayed
Extraction™) Technology for more information.
• Continuous Extraction mode—The extraction field is
continuously applied. Measurement of the ion signal
starts when the laser pulses.
Figure 1-5 Time of Flight Analysis
The time required for ions to reach the detector at the opposite
end of the flight tube (drift time) is measured. The number of
ions reaching the detector at any given time is also measured,
and is referred to as ion intensity (abundance) or signal
intensity.
+
+
+
+
Heavier
ions
Lighter
ions
Flight Path
Time
Intensity
+
+
+
+
+
+
+
+
+
+
+
+
Lighter
ions
Heavier
ions
Kommentare zu diesen Handbüchern