Mass spectrometry

Ke equation

½ x m x v²

4 steps for TOF mass spectrometry

1- Ionization

2 - Acceleration

3 ion drift

4 detection

How does electron gun work

High energy is fired at sample Y

This removes an electron from sample Y

How does electron impact work

1)vapirisation

2) fire electron gun , knocking out , creating postive ion

What happens during acceleration and why is it needed?

Negatively charged , metal plate attracts positive ions

in order for ions to get same kinetic energy regardless of mass

What happens during ions drift

Ions go through flight tube

What is a flight tube

A vacuum so no air resistance and ion can drift without slowing down

What happens during Detection

ions has a positive charge and detection collects electron , movement of electron= current which is detected by computer

How to measure mass in TOF

measure time taken to reach detector

How to measure number of atoms in mass in TOF

size of current

equation that links mass of 1 and time of 2

m1/t1² = m2/t2²