Voyager DP-263-S Guía de usuario Pagina 65

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Parts of the Voyager-DE STR System
Voyager
Biospectrometry
Workstation User’s Guide 1-35
1
Parts of the mass
spectrometer
The Voyager-DE STR mass spectrometer includes:
Laser, attenuator, and prism—A nitrogen laser that
operates at 337 nm and ionizes sample. It produces
3-nanosecond-wide pulses (factory set to 3 Hz). Laser
rate is not user-settable.
The laser attenuator varies the intensity of the laser beam
reaching the sample.
The prism deflects the laser beam into the ion source.
Ion Source—A high voltage region used to accelerate
ions. Includes:
Sample plate and sample stage—An area
supplied with voltage (0 to 25,000 V) for
acceleration of ions into the flight tube.
Variable-voltage grid—A grid supplied with
additional voltage to fine-tune ion acceleration.
Ground grid—Ground surface for formation of
potential gradient.
Collision cell—Provided with CID
(Collision-Induced Dissociation) option for
enhanced fragmentation in PSD analysis.
Grounded aperture—Entrance to flight tube.
For more information on the ion source and voltages, see
Section 5.4.4.2, Setting Accelerating Voltage, and
Section 5.4.3.5, Optimizing Grid Voltage%.
Video camera—A camera that displays a real-time
sample image (100 times magnification) on the video
monitor.
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