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Thermo Scientific
TSQ Altis, Quantis, and Fortis Hardware Manual
149
forepump
The pump that evacuates the foreline. A rotary-vane pump is a type of forepump.
It might also be referred to as a backing, mechanical, rotary-vane, roughing, or vacuum
pump.
fragment ion
A charged dissociation product of an ionic fragmentation. Such an ion can
dissociate further to form other charged molecular or atomic species of successively lower
formula weights.
full-scan type
Provides a full mass spectrum within a defined mass range.
H
heated-electrospray (H-ESI)
Converts ions in solution into ions in the gas phase by using
electrospray (ESI) in combination with heated auxiliary gas.
I
image current detection
The detection of ion motion by the charge (current) induced on
one or more capacitive plates (outer electrodes).
ion detection system
A high sensitivity, off-axis system for detecting ions. It produces a high
signal-to-noise ratio (S/N) and allows for switching of the voltage polarity between positive
ion and negative ion modes of operation. The ion detection system includes two ±12 kVdc
conversion dynodes and a discrete dynode electron multiplier.
ion isolation
A step in the quadrupole Q1 mass analysis where the mass analyzer ejects all
ions except for the ions of interest.
ion isolation waveform voltage
A waveform applied to the linear ion trap that ejects all ions
except the SIM ion or precursor ion.
ion optics
Focuses and transmits ions from the API source to the mass analyzer.
ion polarity mode
The mass spectrometer can operate in either of two ion polarity modes:
positive or negative.
ion sweep cone
A removable cone-shaped metal cover that fits on top of the API ion transfer
tube and acts as a physical barrier to protect the entrance of the tube.
L
lens
A metal disk with a circular hole in the center that allows the ion beam to pass.
M
mass analysis
A process that produces a mixture of ionic species that is then separated
according to the mass-to-charge ratios (
m/z
) of the ions to produce a mass spectrum.
