2.2 Mass Spectrometer

Front 1

Describe and explain the operation of a mass spectrometer.

Back 1

1.the sample is vapourised 2.the sample is ionized(by bombarding with steam of high-energy electrones), because (positive) ions are easier to manipulate than neutral molecules, 2.ACCELERATION - ions are accelerated from this region by the negative grid and pass between the poles of a magnet. 3. DEFLECTION - The beam of positively charged atoms is split by the magnetic field according to the mass-to-charge ratios. 4. DETECTION - measures the mass-to-charge ratio and relative amounts of all the ions present

Front 2

Describe how the mass spectrometer may be used to determine relative atomic mass using the 12C scale.

Back 2

The relative atomic mass is the weighted average of the isotope masses.The mass spectrometer gives lines which correspond to the mass/charge ratio of each particle (ion) and the height of each line is proportional to the abundance of the specific particle.Hence, a knowledge of mass and abundance can be used to calculate relative mass of the element.

Front 3

Calculate non-integer relative atomic masses and abundance of isotopes from given data.

Back 3

uhhh...

Front 4

Mass Spectrometer

Back 4

an instrument which can measure the masses and relative concentrations of atoms and molecules. It makes use of the basic magnetic force on a moving charged particle.

Front 5

fractional abundance

Back 5

the fraction of the total number of atoms that is composed of a particular isotope