topic 7 modern analytical techniques I

ionisation element vapourised high voltage passed over chamber atoms are ionised leaves positive ions

acceleration positive ions accelerated towards negatively charged detection plate

ion drift deflected by a magnetic field into a curved path radiu sof path depends o ncharge and mass of ion

detection positive ions hit negative detection plate gain electron produces flow of charge

analysis current values and flight times produce spectra print out

affected more by magnetic field curved path has smaller radius m/z ratio is halved

multiple eachm/z value by abundance then adding together before dividing by total abundance

infrared radiation determines functional groups different bonds absorb radiation differently

smooth peak from 3230 - 3550

smooth down then spiky upwards peak from 2500 - 3300

small long sharp peak 1620 - 1680

sharp peak 1680 - 1750

right hand side from 500 - 1500 unique for each species tiny differences between species allows molecules to be identified