Mass Spectrometer Mass spectrometere is a very powerful method to analyse the structure of organic compounds.

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Presentation transcript:

Mass Spectrometer Mass spectrometere is a very powerful method to analyse the structure of organic compounds.

Gas chromatographic – Mass spectrometer

How does a Mass Spectrometer work? Separation in analyser according to mass-to-charge ratios (m/z) base on ionization Detection of separated ions and their relative abundance

Fundamental parts 1) ion source - ions are produced, accelerated, and focused; 2) Analyzer - the beam is separated based on mass/charge ratios 3) Collector - the ion beams are measured either sequentially (single collector) or simultaneously (multi-collector).

Stage 1: Ionisation The vaporised sample passes into the ionisation chamber. The electrically heated metal coil gives off electrons which are attracted to the electron trap which is a positively charged plate. The particles in the sample (atoms or molecules) are therefore bombarded with a stream of electrons, and some of the collisions are energetic enough to knock one or more electrons out of the sample particles to make positive ions. Most of the positive ions formed will carry a charge of +1 because it is much more difficult to remove further electrons from an already positive ion. These positive ions are persuaded out into the rest of the machine by the ion repeller which is another metal plate carrying a slight positive charge.

Stage 2 : Acceleration The positive ions are repelled away from the very positive ionisation chamber and pass through three slits, the final one of which is at 0 volts. The middle slit carries some intermediate voltage. All the ions are accelerated into a finely focused beam.

Stage 3 : Deflection Different ions are deflected by the magnetic field by different amounts. The amount of deflection depends on: - The mass of the ion. Lighter ions are deflected more than heavier ones. - The charge on the ion. Ions with 2 (or more) positive charges are deflected more than ones with only 1 positive charge.

Stage 4 : Detection Only ion stream B makes it right through the machine to the ion detector. The other ions collide with the walls where they will pick up electrons and be neutralised. Eventually, they get removed from the mass spectrometer by the vacuum pump.

When an ion hits the metal box, its charge is neutralised by an electron jumping from the metal on to the ion (right hand diagram). That leaves a space amongst the electrons in the metal, and the electrons in the wire shuffle along to fill it. A flow of electrons in the wire is detected as an electric current which can be amplified and recorded. The more ions arriving, the greater the current.

3 major limitations: Compounds cannot be characterised without clean samples This technique has not the ability to provide sensitive and selective analysis of complex mixture For big molecules like peptides spectra are very complex and very difficult to interpret