Voyager DP-263-S Betriebsanweisung PDF herunterladen (Seite 44)

Chapter 1 Introducing the Voyager™ Biospectrometry™ Workstations

1-14 PerSeptive Biosystems

1

Benefits of

Delayed

Extraction

Delayed Extraction of ions overcomes many of the adverse

effects of Continuous Extraction:

Benefits of

Delayed Extraction

Adverse Effects of

Continuous Extraction

Velocity focusing of ions is controlled

by variable-voltage grid in the ion

source and the delay time applied to

acceleration. See “Velocity focusing”

on page 1-15.

Resolution and mass accuracy are

improved.

Initial velocity distribution of ions.

Minimal energy loss from collision of

ions. Ion acceleration is delayed, the

ion/neutral plume becomes less dense,

and ion collision is minimized.

Substantial energy loss from collision of

ions. Ions are accelerated immediately

after sample is ionized and collide in the

dense ion/neutral plume.

Fragmentation is greatly reduced by

acceleration delay.

Background noise is reduced, and the

effect of laser intensity on performance is

minimized.

Background noise from fragmentation in

the source (prompt fragmentation) related

to ion collision.

Less analyte/matrix-dependent

performance because initial velocity

distribution and energy loss is

corrected or minimized.

Analyte/matrix-dependent performance,

because initial velocity distribution and

energy loss conditions are specifically

related to the sample and matrix used.

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