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1911130
mass spectrometry
Description
aqa as level chemistry unit one notes
Mind Map by
Pia Ricioppo
, updated more than 1 year ago
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Created by
Pia Ricioppo
over 9 years ago
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Resource summary
mass spectrometry
ionisation
the samples hit with a high energy stream of electrons from the electron gun.
these electrons 'knock off' the electrons in the outer shell.
this causes the atom of molecule to form a postivly charged ion
IF the electron from the electron gun has a high enough energy ANOTHER electron will be removed
this causes a doubly charged ion
eg;
heres the basic principle;
ACCELERATIOn
ions are now accelerated by an electric field caused by the positive charged plates.
the slits in the plates narrow the beam
the ions are accelerated towards the magnetic field.
the rate at which they're accelerated is proportional the the m/z ratio.
deflection
accelerated ions are deflected by an electromagnetic field
for each ion the degree of deflection depends on the m/z ratio
DEFLECTIONS GREATER IF
the mass of the ions smaller
the charge of the ions greater
the strength of the field greater
DEFLECTIONS LESS IF;
the mass of the ions larger
charged of +ve ions lower
the strength of magnetic fields less
detection
as an ion reaches a detector it produce a tiny current.
the number of electrons realised and the current produced is proportional to the number of ions striking the detector
the detectors linked to an amplifier
then to a recorder which converts the current into a peak which is shown on mass spectrum.
interpreting the mass spectra;
mass spectra are graphs which give info about each ion produced in the sample
it shows m/z ratio of each ion
shows abundance of each ion
infos used to work out relative atomic mass
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