Axis BTA 2100D Betreibershandbuch PDF herunterladen (Seite 220)

100

101

218

High Edge Offset: This parameter provides a fine adjustment for the isolation

window to optimize the ejection of the mass just above the parent ion mass. The

High Edge Offset range is -20 to 20 steps. The default value is a function of the

parent ion mass.

Large positive values widen the isolation window towards high masses.

High Edge Amplitude: Amplitude of broadband waveform used in the two-step

isolation to eject masses above the isolated parent ion. The default value works

well for stable ions, but may need to be reduced for unstable ions. The range of

values is 0 to 60 volts with a default value of 30 volts.

Isolation Time: The dwell time that the broadband waveform is applied during

the high mass elimination step. The default value works well for stable ions, but

may need to be reduced for unstable ions. The range of values is 1 to 10 msec

with a default value of 5 msec.

NOTE: In the case of unstable ions, the isolation efficiency can be improved by

decreasing the isolation time.

Dissociation

Excitation Time: The excitation time is the time required for collision-induced

dissociation (CID) by ion excitation. The excitation time range is 0 to 1000 msec.

The default excitation time is 20 msec for both resonant and nonresonant

excitation.

Modulation Range: The step range over which the rf storage field is modulated

during resonant CID. This modulation greatly reduces any effect of changing

secular frequency with concentration. The default is sufficient for exciting a single

ion. When trying to excite an isotopic cluster, increase this value and/or increase

the CID bandwidth. The range is 0 to 12 steps. The default value is 2 steps.

1 2 ... 215 216 217 218 219 220 221 222 223 224 225 ... 596 597

Kommentare zu diesen Handbüchern

Keine Kommentare

Axis BTA 2100D Betreibershandbuch Seite 220

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Software Axis BTA 2100D