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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