Item
Description
8
Skimmer
9
CUR (Curtain Gas
™
flow)
The system uses the Turbo V ion source which can use either the TurboIonSpray probe or the
atmospheric pressure chemical ionization (APCI) probe to produce ions from liquid samples.
The mass spectrometer is configured to perform complex MS/MS analysis, but for less rigorous
analytical requirements it can perform single MS scans.
The linear ion trap (LIT) functionality provides a number of Enhanced modes of operation. A
common factor of the Enhanced modes is that ions are trapped in the Q3 quadrupole region
and then scanned out to produce full spectrum data. Many spectra are rapidly collected in a
short period of time and are significantly more intense than spectra collected in a comparable
standard quadrupole mode of operation.
During the collection phase, ions pass through the Q2 collision cell where the CAD gas focuses
the ions into the Q3 region. The Q3 quadrupole is operated with only the main RF voltage
applied. Ions are prevented from passing through the Q3 quadrupole and are reflected back by
an exit lens to which a DC barrier voltage is applied. After the fill time elapses, a time defined
by the user, or determined by the Dynamic Fill Time feature, a DC barrier voltage is applied to
the Q3 entrance lens (IQ3). This voltage confines the collected ions in the Q3 region and stops
additional ions from entering. The entrance and exit lens DC voltage barriers and the RF voltage
applied to the quadrupole rods confine the ions within the Q3 region.
During the scan out phase, the voltage on the exit lens and the auxiliary RF voltage are ramped
simultaneously with the main RF voltage for increased resolution and sensitivity as compared to
quadrupole scan types. An auxiliary AC frequency is applied to the Q3 quadrupole. The main
RF voltage amplitude is ramped from low to high values, which sequentially brings masses into
resonance with the auxiliary AC frequency. When ions are brought into resonance with the AC
frequency, they acquire enough axial velocity to overcome the exit lens barrier and are axially
ejected towards the mass spectrometer ion detector. Full spectra data can be acquired from the
ions collected in the Q3 region by rapidly scanning the main RF voltage.
Principles of Operation
System User Guide
RUO-IDV-05-6475-C
SCIEX 3200 Systems
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