
Chapter 1 Introducing the Voyager™ Biospectrometry™ Workstations
1-12 PerSeptive Biosystems
1
Delayed
Extraction
With Voyager-DE
™
(Delayed Extraction
™
) technology, ions
form in a field-free region, and then are extracted by applying
a high voltage pulse to the accelerating voltage after a
predetermined time delay.
Figure 1-6 compares Delayed and Continuous Extraction.
Figure 1-6 Delayed Versus Continuous Extraction
Delayed
Extraction versus
Continuous
Extraction
The Voyager-DE systems can be operated in Delayed
Extraction (DE) or Continuous Extraction mode.
NOTE: Due to the superior results obtained with Delayed
Extraction (DE) mode, use Continuous Extraction
mode for
diagnostic purposes only. See Appendix H, Continuous
Extraction Mode, for more information on optimizing
methods and obtaining good spectra.
In Delayed Extraction mode:
• Potential gradient does not exist when sample is ionized
(sample plate and grid are at similar potentials)
• Accelerating voltage is pulsed after a user-set time delay
(potential gradient is applied) and ions are accelerated
Accelerating
voltage
Grid
voltage
laser pulse
time
U
Continuous Extraction
Accelerating
voltage
Grid
voltage
laser pulse
time
U
time
delay
Delayed Extraction
PB100772
Kommentare zu diesen Handbüchern