Mass Spectrometry

Which is the correct sequence for the TOF mass spectrometer?

• Ionisation

  Acceleration

  Ion-drift

  detection

• Ionisation

  Ion-drift

  Acceleration

  detection

• Acceleration

  Ionisation

  Ion-drift

  detection

• Ion-drift

  Ionisation

  acceleration

  detection

What kind of particles are used in mass spectrometry?

• Anions
• Cations
• atoms

• radicals

Which of the following is a method of ionisation used in mass spectrometry?

• ion impact

• spray fission

• electron impact

• plasma

What is the charge of the ions normally produced by ionisation in the mass spectrometer?

• +2

• +1

• -1

• -2

The ions produced in the mass spectrometer are accelerated so that they have the same...

• velocity

• mass

• momentum

• kinetic energy

Which of these is a correctly rearrangement of KE=1/2 mv²

• v = √(2KE/m)

• v = √(2m/KE)

• v = √(KE/2m)

• √v = 2KE/m

Which of the following ions would reach the detector first?

• Kr⁷⁸

• Kr⁸⁰

• Kr⁸²

• Kr⁸³

When the ions hit the detector they..

• gain an electron

• lose an electron

• are destroyed

• form molecules

Which element does this mass spectrum most likely represent?

• neon
• scandium
• boron
• sodium

What do the heights of the peaks represent in the mass spectrum?

• number of isotopes
• relative abundance of each isotope
• average atomic mass
• charge:mass ratio