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MassNumber Key Probable Additional Mass(m/e) fragments Parent Molecule(s) Number (m/e)1 H+ H2 2H+ H2O 18, 17, 16H+ CxHy 12, 13, 14, 26, 27 etc.2 H2+ H2 1He++ He 44 He+ He 26 C++ CO 12, 28, 29C++ CO2 12, 28, 44C++ CxHy 12, 13, 14, 26, 27 etc.7 N++ N2 14, 28, 298 O++ O2 16, 32, 34O++ H2O 16, 17, 1812 C+ CO 28, 29C+ CO2 28, 29, 44C+ CxHy 13, 14, 26, 27 etc.13 CH+ CxHy 12, 14, 26, 27 etc.14 N+ N2 28, 29N+ NH3 15, 16, 17CH2+ CxHy 12, 13, 26, 27 etc.CO++ CO 28, 2915 CH3+ CxHy 12, 13, 14, 26, 27 etc.NH+ NH3 14, 16, 1716 O+ O2 32, 34O+ H2O 17, 18CH4+ CH4 12, 13, 14, 15NH2+ NH3 14, 15, 1717 OH+ H2O 16, 18NH3+ NH3 14, 15, 1618 H2O+ H2O 16, 1719 F+ F2 38F+ HF 2020 HF+ HF 1920Ne+ 20Ne 22Ar++ Ar 4022 CO2++ CO2 6, 12, 28, 29, 4422Ne+ 22Ne 2024 C2+ CxHy 12, 13, 14, 26, 2726 C2H2+ CxHy 12, 13, 14, 24, 2727 C2H3+ CxHy 12, 13, 14, 24, 2628 N2+ N2 7, 14, 29C2H4+ CxHy 12, 13, 14, 24, 26CO+ CO 6, 12, 29CO+ CO2 6, 12, 29, 4429 C2H5+ CxHy 12, 13, 14, 24, 26, 27, 2814N15N+ N2 7, 14, 2830 C2H6+ C2H6 12, 13, 14, 24, 26, 27, 28, 29NO+ NO 14, 1631 C2H2OH+ C2H3OH 26, 28, 2932 O2+ O2 8, 16, 34S+ H2S 33, 34S+ SO2 34, 6434 H232S+ H2S 32, 3334S + H2S 32, 33, 3416O18O+ O2 8, 16, 3235 35Cl+ Cl2 37, 70, 72,7435Cl+ HCL 36, 37, 3836 H35Cl+ HCl 35, 37, 3836Ar+ Ar 20, 38, 4037 37Cl+ Cl2 35, 70, 72, 7437Cl+ HCl 35, 36, 3838 H37Cl+ HCl 35,36,37C3H2+ CxHy 12, 13, 14, 24, 26, 27, 2838Ar+ Ar 20, 36, 4039 C3H3+ CxHy 12, 13, 14, 24, 26, 27, 28, 3839K+ K 4140 Ar+ Ar 36, 38C3H4+ CxHy 12, 13, 14, 24, 26, 27, 28, 38, 3941 C3H5+ CxHy 12, 13, 14, 24, 26, 27, 28, 38, 3941K+ K 3942 C3H6+ CxHy 12, 13, 14, 24, 26, 27, 28, 38, 3943 C3H7+ CxHy 12, 13, 14, 24, 26, 27, 28, 38, 39C2H3O+ C2H5OH (alcohol) 31, 44, 45, 4644 C3H8+ C3H8 41, 42, 43CO2+ CO2 6, 12, 28, 29C2H4OH+ C2H5OH (alcohol) 31, 43, 45, 46N2O+ N2O 14, 16, 2845 C2H5O+ C2H5OH (alcohol) 31, 43, 44, 4613CO2+ CO2 6, 12, 28, 29, 4446 NO2+ NO2 14, 16C2H5OH+ C2H5OH (alcohol) 31, 43, 44, 4548 SO+ SO2 32, 6455 C4H7+ CxHy 12, 13, 14, 24, 26, 27, 28, 38, 3957 C4H9+ CxHy 12, 13, 14, 24, 26, 27, 28, 38, 3958 (CH3)2CO+ C3H6O (acetone) 4364 SO2+ SO2 32, 4877 C6H5+ Phenyl 50, 51, 5278 C6H6+ C6H6 (benzene) 50, 51, 52