(26) mass spec & DBE

Question 1

name the 4 stages of mass spectroscopy

Answer 1

1. ionisation -
2. acceleration
3. seperation
4. detection

Question 2

define fragmentation

Answer 2

where high energy electrons break apart molecules into smaller cations

Question 3

compare electron impact ionisation with eletrospray ionisation

Answer 3

EI -

high energy electrons
molecular peak at M
fragmentation gives information on functional groups present
less common

ESI+

softer ionisation technique
peak at M+1 or M-1
no fragmentation
used routinely in research