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A2 Chemistry Unit 2 > Mass Spectrometry > Flashcards

Flashcards in Mass Spectrometry Deck (8)
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1

How does mass spec work

Vaporises sample
Changes to positively charged ions

2

What are the uses of mass spec

RAM of element
RFM of compound
Existence of isotopes + relative abundances
Molecular groups in compounds - fragmentation pattern
Identify structure
Mechanism of a reaction

3

What is the definition of an m+1 peak

Peak produced by a molecular ion with an increased mass due to the presence of one c-13 atom

4

What does the m+1 peak allow you to measure and what is the % abundance of one c13

The number of C in a molecule
1.1%

5

What is the general equation when a molecular ion is formed

M(g) ➡️ M+(g) + e-

6

What is the definition of a fragmentation ion

A positively charged ion produced when the molecular ion breaks apart

7

What is the definition of a molecular ion peak

Peak formed by an ion formed by the removal of one e- from a molecule

8

What is the definition of base peak

Peak of greatest abundance in a mass spectrum