Illustrated Glossary of Organic Chemistry
Molecular
ion
:
In
mass spectrometry
a
molecule
of the
analyte
that has been
ionized
by electron loss, but not
fragmented
.
Ionization
Fragmentation
CH
3
+
+
H
+
Analyte
Molecular
ion
Fragments
m/z
m/z
Relative abundance
(%)
Assignment
18
< 0.5
Molecular
ion
(
M+2
)
17
1.1
Molecular
ion
(
M+1
)
16
100.0
Molecular
ion
(
M
);
base peak
15
85.0
Fragment
(
M
- H)
14
9.2
Fragment
(
M
- 2H)
13
3.0
Fragment
(
M
- 3H)
12
1.0
Fragment
(
M
- 4H)
Mass spectrum
of
methane
.
Related terms:
Mass spectrometer
,
radical cation
,
molecular formula
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