chemistry lesson 4 miss b

a level chemistry notes:

time of flight mass spectrometry:

• stage 1: ionisation~
• main method in use is electronspray ionisation
• the sample is dissolved in a volatile solvent and injected through a fine hypodermicc needle as a fine spray into a vacuum in the ionisation chamber
• a high voltage is applied to the end of the needle where the spray emerges this- produces tiny positively charged droplets (due to the loss off electrons)
• the solvent evaporates leaving 1+ ions

stage 2: separation of charged ions~

• ions with different masses have a different time of flight
• the ions…