Technical Description: System
Principle of Operation
B-2
Prima PRO & Sentinel PRO Mass Spectrometers User Guide
Thermo Fisher Scientific
Figure B
–1.
Hardware components
Sample gas is ionised by electron impact in the source. Ions injected
into a magnetic field will describe a circular orbit where the radius is
dependent on the initial velocity of the ion, its mass, charge and the
strength of the magnetic field.
This relationship is described in Equation 1:
z
H
x
MV
R
2
2
Equation 1.
Where:
R = radius of orbit
M = mass of the particle
V = voltage applied to the particle to accelerate it to velocity ‘v’
H = magnetic field
z = charge on the ion
Principle of
Operation
Inlet controller
RMS valve
Turbo molecular pump
Inlet probe
Source assembly
Vacuum housing
AC power distribution
DC power distribution
A/C unit
Magnet control
Embedded controller
Digital & serial I/O
Amplifier & detectors
Electromagnet
Analyser supplies
Vacuum gauge
constant
