User`s guide

Parts of the Voyager-DE STR System
Voyager
™
Biospectrometry
™
Workstation User’s Guide 1-37
1
The single-stage design provides high mass resolution
across a wide range and highly accurate mass
measurements. Accurate calibration formulas for the
single-stage reflector allow the user to vary instrument
conditions without degrading mass accuracy. Also, easy
calibration of PSD data is facilitated by single-stage
reflectors. For more information, see Chapter 7, PSD
Analysis.
• Reflector detector—The reflector detector measures
ions reflected by the mirror. The reflector detector sends
a signal to the digitizer for conversion.
Two multichannel plate reflector detectors optimized for
response time are included.
• Timed Ion Selector—A device that allows only ions of a
selected mass of interest to pass to the detector.
The Timed Ion Selector (TIS) device is a
Bradbury-Nielson gate positioned approximately 676 mm
from the ion source. This prevents ions deflected by the
gate from entering the reflector and reduces background
noise in the detector in PSD experiments.
When the Timed Ion Selector is turned on, voltage is
applied to the Time Ion Selector to deflect ions. At the
time that corresponds to the ion of interest, voltage is
turned off, and the ion of interest passes to the detector.
After the ion passes through the Timed Ion Selector,
voltage is turned on again.