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Functional Description
API Source _________________________________________________________________
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___________________ LCQ Deca XP Plus Hardware Manual ________________
API Stack
The API stack consists of the components of the API source that are held
under vacuum, except for the atmospheric pressure side of the spray shield,
and the components of the ion sweep. The API stack includes the spray shield,
ion sweep cone, spray cone, ion transfer capillary, heater assembly, vent
prevent ball valve, extension mount, tube lens, skimmer, and tube lens and
skimmer mount. See Figure 1-7. The same API stack is used for ESI, APCI,
and NSI ionization techniques.
The spray shield is a stainless steel cylindrical vessel that, in combination
with the ESI, APCI, or NSI flange, and the spray cone, forms the atmospheric
pressure region of the API source (also called the spray chamber). The spray
shield inserts into an opening in the vacuum manifold and serves as a base for
the API stack. An opening in the bottom of the spray shield serves as a drain
for waste liquid. Two flange retainer bolts on the ESI, APCI, or NSI flange
secure the flange to the atmospheric pressure side of the spray chamber.
The ion sweep cone is the outer stainless steel cone that is held by the spray
cone. The spray cone is a stainless steel cone that fastens to the spray shield.
The ion sweep cone is usually placed in one of two positions on the spray
cone. This allows the distance between the opening of the ion sweep cone and
the opening of the ion transfer capillary (see below) to be set to one of two
definite values. Nitrogen can be made to flow in the gap between the ion
sweep cone and the spray cone, and to exit the openings of the ion sweep
cone.
The ion transfer capillary is an elongated cylindrical stainless steel tube that
is attached to the spray cone. The ion transfer capillary assists in desolvating
ions that are produced by the ESI, APCI, or NSI probes. Ions are focused into
the ion transfer capillary in the atmospheric pressure region and transported to
the skimmer region of the vacuum manifold by a decreasing pressure gradient
and electrostatic forces. The ion transfer capillary can be heated to 300 ºC.
Typical temperatures of the ion transfer capillary are 200 °C for ESI, 150 °C
for APCI, and 165 °C for NSI.
The heater assembly is a dual cartridge heater that surrounds the ion transfer
capillary but is not connected to the ion transfer capillary. The ion transfer
capillary passes through a vent prevent ball valve that automatically seals if
the ion transfer capillary is removed. Therefore, the ion transfer capillary may
be removed and replaced without venting the instrument.
The extension mount is a combined tube and flange like part that mounts to
the spray shield. The extension mount surrounds the ion transfer capillary and
is a mount for the tube lens and skimmer mount.
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