Key fragment ions
Mass
Number Key Probable Additional Mass
(m/e) fragments Parent Molecule(s) Number (m/e)
1 H+ H2 2
H+ H2O 18, 17, 16
H+ CxHy 12, 13, 14, 26, 27 etc.
2 H2+ H2 1
He++ He 4
4 He+ He 2
6 C++ CO 12, 28, 29
C++ CO2 12, 28, 44
C++ CxHy 12, 13, 14, 26, 27 etc.
7 N++ N2 14, 28, 29
8 O++ O2 16, 32, 34
O++ H2O 16, 17, 18
12 C+ CO 28, 29
C+ CO2 28, 29, 44
C+ CxHy 13, 14, 26, 27 etc.
13 CH+ CxHy 12, 14, 26, 27 etc.
14 N+ N2 28, 29
N+ NH3 15, 16, 17
CH2+ CxHy 12, 13, 26, 27 etc.
CO++ CO 28, 29
15 CH3+ CxHy 12, 13, 14, 26, 27 etc.
NH+ NH3 14, 16, 17
16 O+ O2 32, 34
O+ H2O 17, 18
CH4+ CH4 12, 13, 14, 15
NH2+ NH3 14, 15, 17
17 OH+ H2O 16, 18
NH3+ NH3 14, 15, 16
18 H2O+ H2O 16, 17
19 F+ F2 38
F+ HF 20
20 HF+ HF 19
20Ne+ 20Ne 22
Ar++ Ar 40
22 CO2++ CO2 6, 12, 28, 29, 44
22Ne+ 22Ne 20
24 C2+ CxHy 12, 13, 14, 26, 27
26 C2H2+ CxHy 12, 13, 14, 24, 27
27 C2H3+ CxHy 12, 13, 14, 24, 26
28 N2+ N2 7, 14, 29
C2H4+ CxHy 12, 13, 14, 24, 26
CO+ CO 6, 12, 29
CO+ CO2 6, 12, 29, 44
29 C2H5+ CxHy 12, 13, 14, 24, 26, 27, 28
14N15N+ N2 7, 14, 28
30 C2H6+ C2H6 12, 13, 14, 24, 26, 27, 28, 29
NO+ NO 14, 16
31 C2H2OH+ C2H3OH 26, 28, 29
32 O2+ O2 8, 16, 34
S+ H2S 33, 34
S+ SO2 34, 64
34 H232S+ H2S 32, 33
34S + H2S 32, 33, 34
16O18O+ O2 8, 16, 32
35 35Cl+ Cl2 37, 70, 72,74
35Cl+ HCL 36, 37, 38
36 H35Cl+ HCl 35, 37, 38
36Ar+ Ar 20, 38, 40
37 37Cl+ Cl2 35, 70, 72, 74
37Cl+ HCl 35, 36, 38
38 H37Cl+ HCl 35,36,37
C3H2+ CxHy 12, 13, 14, 24, 26, 27, 28
38Ar+ Ar 20, 36, 40
39 C3H3+ CxHy 12, 13, 14, 24, 26, 27, 28, 38
39K+ K 41
40 Ar+ Ar 36, 38
C3H4+ CxHy 12, 13, 14, 24, 26, 27, 28, 38, 39
41 C3H5+ CxHy 12, 13, 14, 24, 26, 27, 28, 38, 39
41K+ K 39
42 C3H6+ CxHy 12, 13, 14, 24, 26, 27, 28, 38, 39
43 C3H7+ CxHy 12, 13, 14, 24, 26, 27, 28, 38, 39
C2H3O+ C2H5OH (alcohol) 31, 44, 45, 46
44 C3H8+ C3H8 41, 42, 43
CO2+ CO2 6, 12, 28, 29
C2H4OH+ C2H5OH (alcohol) 31, 43, 45, 46
N2O+ N2O 14, 16, 28
45 C2H5O+ C2H5OH (alcohol) 31, 43, 44, 46
13CO2+ CO2 6, 12, 28, 29, 44
46 NO2+ NO2 14, 16
C2H5OH+ C2H5OH (alcohol) 31, 43, 44, 45
48 SO+ SO2 32, 64
55 C4H7+ CxHy 12, 13, 14, 24, 26, 27, 28, 38, 39
57 C4H9+ CxHy 12, 13, 14, 24, 26, 27, 28, 38, 39
58 (CH3)2CO+ C3H6O (acetone) 43
64 SO2+ SO2 32, 48
77 C6H5+ Phenyl 50, 51, 52
78 C6H6+ C6H6 (benzene) 50, 51, 52
92.5 185Re++ Rhenium (filament) 93.5, 185, 187
93.5 187Re++ Rhenium (filament) 92.5, 185, 187
149 Phthalic ester (softening agent)
182 182W+ Tungsten (filament) 183, 184, 186
183 183W+ Tungsten (filament) 182, 184, 186
184 184W+ Tungsten (filament) 182, 183, 186
185 185Re+ Rhenium (filament) 187
187 187Re+ Rhenium (filament) 185
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