Mass of spectrometry

Question 1

Explain ionisation by electron impact

Answer 1

Sample is vaporised, then high energy electrons come from a electron gun which knocks of an electron forming a +1 ion

Question 2

Explain ionisation by electro spray ionisation

Answer 2

Sample is dissolved into volatile solvent and injected through hyper dermic needle to give a fine mist. Tip of needle is attached to positive terminal of high voltage power supply. Which ionises the sample by it gaining a proton H+ ion

Question 3

Ions are accelerated by

Answer 3

Negatively charged plate

Question 4

How is abundance of ions measured

Answer 4

Ions gain electron which produces a current relative to the abundance

Question 5

Definition of first ionisation energy

Answer 5

Amount of energy required to remove one mole of an electron from one mole an atom in its gaseous state

Question 6

Definition of mr

Answer 6

the average mass of a molecule relative to 1/12 of the mass of an atom of carbon