C17 - Analysis Techniques Flashcards
1
Q
Describe how a mass spectrometer works
A
1 – ionisation
Bombarded with electrons, knocks off electrons to make positive ions
2 – acceleration
Electric field accelerate or ions to same kinetic energy
3 - drift region
Heavier ions travel more slowly than lighter ions
4 – detector
Electric plate records charge due to ions. Time = of ions
2
Q
Describe how an infrared spectrometer works
A
Shine infrared at molecules and measure what is readmitted thus to work out what vibrational energy they use so what bonds they have (functional group)
3
Q
What is the fingerprint region
A
Region below 1500 on infrared spectroscopy, difficult to identify. Using a database to compare I can give you exact molecule