
Enhancing Fragmentation with CID
Voyager
™
Biospectrometry
™
Workstation User’s Guide 7-11
7
7.2 Enhancing
Fragmentation with CID
Overview
Collision-induced dissociation (CID) is a technology that
enhances fragmentation in Post-Source Decay (PSD)
analysis. CID is available as an option on the
Voyager-DE PRO and Voyager-DE STR workstations.
The CID option includes:
• A 0.5 cc cylindrical cell (collision cell) in the ion source
region connected to the grounded aperture
• External CID box with valves to control CID gas flow
Figure 7-5 shows the plumbing of the CID option.
Figure 7-5 CID Option Plumbing
When supplied with gas, the collision cell has a higher
pressure than the source. As ions leave the source, they pass
through the collision cell and interact with the collision gas
molecules. Energy is transferred to the ions and fragmentation
is enhanced.
Main
source
(high-vacuum)
Turbo
pump 1
chamber
External gas source
or atmosphere
Grids
in source
Collision
cell
CID
box
To Fore pump
Flight tube
3-way
Metering
valve
valve
Purge line
Gas inlet
line
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