Axis BTA 2100D Manual del operador Pagina 212

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multiple chemical bonds or that undergo significant rearrangements. Periodic
modulation through ion resonance results in an averaging of the energy coupled
into the ion motion and provides a reproducible product ion spectrum, even with
changes in concentration. A disadvantage of this method is that two parameters
in addition to the excitation time and CID excitation amplitude need to be
optimized; these are the modulation range and CID bandwidth.
Changing the CID bandwidth permits simultaneous excitation of ions within a
range of masses. As CID bandwidth increases, the corresponding mass range
also increases. At a given CID bandwidth, mass range increases with increasing
ion mass, and decreases with increasing excitation rf storage level.
Excitation rf Storage Level (m/z): 48
CID Bandwidth
()
Mass
Range
0
10
20
30
40
50
60
0 2 4 6 8 101214161820
m/z=500 m/z=400 m/z=300 m/z=200 m/z=100
Mass range vs. CID bandwidth for an excitation rf storage level of 48 m/z
Excitation rf Storage Level (m/z): 143
CID Bandwidth
Mass
Range
0
5
10
15
20
25
30
0 2 4 6 8 101214161820
m/z=500 m/z=400 m/z=300 m/z=200
Mass range vs. CID bandwidth for an excitation rf storage level of 143 m/z
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