Ionization Potentials (IPs) of Common Chemicals

Below find a handy reference table featuring compound names, formulas, and ionization potentials for an assortment of gasses and vapors. Use this information as a reference while using our PIDs and FIDs. For introductory information about PIDs check our PID Tutorial. For introductory information about FIDs check our FID Tutorial.

Compound Formula IP
Acetaldehyde CH3CHO 10.23
Acetic Acid CH3COOH 10.66
Acetic Anhydride (CH3CO)2O 10.00
Acetone CH3COCH3 9.70
Acetonitrile CH3CN 12.20
Acrolein CH2CHCHO 10.10
Acrylamide-Skin CH2CHCONH2 9.50
Acrylonitrile-Skin CH2CHCN 10.92
AllylChloride CH2CHCH2Cl 9.90
AllylAlcohol-Skin CH2CHCH2OH 9.67
2-amino pyridine C5H6N2 8.00
Ammonia NH3 10.16
Aniline-Skin C6H5NH2 7.72
Anisidine(O,P, isomers)-Skin NH2C6H4OCH3 7.46
Arsine AsH3 9.89
Benzene C6H6 9.24
Boron oxide B2O3 13.50
Boron Trifluoride BF3 15.56
Bromine Br2 10.51
Bromoform-Skin CHBr3 10.48
Butadiene,1,3-Butadiene) CH2CHCHCH2 9.07
2-Butanone(MEK) CH3COCH2CH3 9.51
2-Butoxyethanol(ButylCellosolve) C4H9OCH2CH2OH 10.00
Butyl Acetate(n-Butyl Acetate) CH3COO(CH2)3CH3 10.00
sec-Butyl Acetate CH3COOCHCH3C2H5 9.90
n-Butyl Acetate CH3CH2CH2CH2OH 10.06
sec-Butyl Alcohol CH3CHOHCH2CH3 9.88
Butyl Mercaptan CH3CH2CH2CH2SH 9.14
p-tert-Butyl toluene CH3C6H4C4H9 8.28
Butylamine-Skin C4H9NH2 8.71
Camphor C10H16O 8.76
Carbon Dioxide CO2 13.77
Carbon Disulfide CS2 10.07
Carbon Monoxide CO 14.01
Carbon Tetra chloride CCl4 11.47
Chlorine Cl2 11.48
Chlorine dioxide ClO2 10.36
Chlorine Trifluoride ClF3 12.65
Chloracetaldehyde ClCH2CHO 10.48
a-Chloracetophenone(Phenacylchloride) C6H5COCH2Cl 9.44
Chlorobenzene(monochlorobenzene) C6H5Cl 9.06
Chlorobromomethane CH2BrCl 10.77
Chloroform(Trichloromethane) CHCl3 11.37
1-Chloro-1-nitro-propane C2H5CHClNO2 9.90
Chrysene C18H12 7.59
Cresol(all isomers)-skin CH3C6H4OH(o-) 8.14
Crotonaldehyde CH3CHCHCHO 9.73
Cumene(Isopropyl Benzene) C6H5C3H7 8.73
Cyclohexane C6H12 9.86
Cyclohexanol C6H11OH 9.75
Cyclohexanone C6H10O 9.14
Cyclohexene C6H10 8.94
Cyclopentadiene C5H6 8.56
Decaborane-skin B10H14 9.88
Diazomethane CH2NH2 9.00
Diborane B2H6 11.38
o-Dichlorobenzene C6H4Cl2 9.06
p-Dichlorobenzene C6H4Cl2 8.89
Dichlorodifluoromethane(freon 12) CCl2F2 11.75
1,1-Dichloroethane CH3CHCl2 11.06
1,2-Dichloroethylene ClCHCHCl 9.65
Dichloromonofluoromethane(freon 21) CHCl2F 11.50
Dichlorotetrafluoroethane(freon 114) F2ClCClF2 12.20
Diethylamine (C2H5)2NH 8.01
Difluorodibromomethane(freon 12B2) CBr2F2 11.07
Diisobutyl ketone ((CH3)2CHCH2)2CO 9.04
Diisopropylamine (CH3)2CHNHCH(CH3)2 7.73
N,N-Dimethylacetamide-skin CH3CON(CH3)2 8.81
Dimethylamine (CH3)2NH 8.23
Dimethylaniline C6H5N(CH3)2 7.13
Dimethylformamide-skin HCON(CH3)2 9.13
1,1-dimethylhydrazine-skin (CH3)2NNH2 7.28
Dimethylphthalate C10H10O4 9.64
Dinitrobenzene C6H4(NO2)2 10.71
Dioxane (Diethylene Dioxide)-skin OCH2CH2OCH2CH2 9.19
Diphenyl C6H5C6H5 7.95
Epichlorohydrin-skin C3H5OCl 10.20
Ethanolamine HOCH2CH2NH2 8.96
Ethyl Acetate CH3COOC2H5 10.01
Ethyl Acrylate-skin CH2CHCOOC2H5 10.30
Ethyl Alcohol (Ethanol) C2H5OH 10.47
Ethyl Chloride C2H5Cl 10.97
Ethyl Ether C2H5OC2H5 9.51
Ethyl Formate HCOOC2H5 10.61
Ethyl Mercaptan C2H5SH 9.29
Ethyl Silicate (C2H5)4SiO4 9.77
Ethylamine C2H5NH2 8.86
Ethylene Chlorohydrin-skin CH2ClCH2OH 10.52
Ethylene Dibromide(1,2-Dibromoethane) CH2BrCH2Br 10.37
Ethylene Dichloride(1,2-Dichloroethane) ClCH2CH2Cl 11.05
Ethylene oxide C2H4O 10.56
Ethylenediamine NH2CH2CH2NH2 8.60
Ethylenelmine C2H5N 9.20
Ferbam ((CH3)2NCS2)3Fe 7.72
Fluorine F2 15.70
Fluorotrichloromethane(freon 11) CCl3F 11.77
Formaldehyde HCHO 10.88
Formic Acid HCOOH 11.33
Furfural-skin C4H3OCHO 9.21
Heptane (n-Heptane) C7H16 9.92
Hexachloroethane CCl3CCl3 11.10
Hexane (n-Hexane) C6H14 10.13
2-Hexanone CH3CO(CH2)3CH3 9.35
Hexone(Methyl isobutyl ketone) CH3COCH2C3H7 9.30
Hydrazine-skin N2H4 8.10
Hydrogen Bromide HBr 11.66
Hydrogen Chloride HCl 12.72
Hydrogen Cyanide-skin HCN 13.60
Hydrogen Fluoride HF 16.04
Hydrogen Peroxide 90 H2O2 10.54
Hydrogen Selenide H2Se 9.88
Hydrogen Sulfide H2S 10.46
Hydroquinone C6H6O2 7.95
Iodine l2 9.39
Isobutyl Alcohol (CH3)2CHCH2OH 10.12
Isophorone C9H14O 9.07
Isopropyl Acetate CH3COOCH(CH3)2 9.99
Isopropyl Alcohol CH3CHOHCH3 10.12
Isopropyl Ether ((CH3)2CH)2O 9.20
Isopropylamine (CH3)2CHNH2 8.72
Ketene CH2CO 9.61
Maleic Anhydride (CHCO)2O 10.80
Mesityl oxide CH3COCH5C(CH2)2 9.08
Methyl Acetate CH3COOCH3 10.27
Methyl Acetylene-(Propyne) C3H4 10.37
Methyl Acrylate CH2CHCOOCH3 9.90
Methyl Alcohol CH3OH 10.85
Methyl n-Amyl Ketone (2-Heptanone) CH3COC5H11 9.30
Methyl Bromide CH3Br 10.54
Methyl Cellosolve CH3OCH2CH2OH 9.60
Methyl Chloride CH3Cl 11.22
Methyl Chloroform CH3CCl3 11.00
Methyl Formate HCOOCH3 10.81
Methyl Iodide-skin CH3l 9.52
Methyl Isocyanate CH3NCO 10.67
Methyl Mercaptan CH3SH 9.44
Methyl Methacrylate CH2C(CH3)COOCH3 9.70
Methyl Styrene C6H5C(CH3)CH2 8.19
Methylal(dimethoxy-methane) CH3OCH2OCH3 9.50
Methylamine CH3NH2 8.97
Methylcyclohexane CH3C6H11 9.64
Methylcyclohexanol CH3C6H10OH 9.80
Methylene Chloride CH2Cl2 11.32
Monomethylaniline C6H5NHCH3 7.33
Monomethyl hydrazine-skin CH3NHNH2 7.67
Morpholine-skin C4H9ON 8.20
Naphthalene C10H8 8.14
Nickel Carbonyl Ni(CO)4 8.27
Nitric Acid HNO3 11.95
Nitric Oxide(NO) NO 9.26
Nitrobenzene C6H5NO2 9.86
Nitroethane C2H5NO2 10.88
p-Nitrochloro benzene ClC6H4NO2 9.96
Nitrogen Dioxide NO2 and N2O4 9.75
Nitrogen Trifluoride NF3 12.97
Nitromethane CH3NO2 11.04
1-Nitropropane CH3CH2CH2NO2 10.81
2-Nitropropane (CH3)2CHNO2 10.71
Nitrotoluene-skin NO2C6H4CH3 9.45
Octane C8H13 9.82
Oxygen Difluoride OF2 13.11
Ozone O3 12.43
Pentaborane B5H9 9.90
Pentane C5H12 10.35
Pentanone CH3COC3H7 9.38
Perchloroethylene C2Cl4 9.32
Perchloryl Fluoride ClO3F 12.94
Phenol-skin C6H5OH 8.47
Phenylether (vapor) (C6H5)2O 8.09
p-Phenylene diamine-skin C6H8N2 6.89
Phenylhydrazine-skin C6H5NHNH2 8.00
Phosgene (Carbonyl Chloride) COCl2 11.40
Phosphine PH3 9.87
Phosphorus Trichloride PCl3 9.91
Phthalic Anhydride C6H4(CO)2O 10.00
Propane CH3CH2CH3 10.95
Propargyl Alcohol HCCCH2OH 10.51
n-propyl Acetate CH3COOCH2CH3 10.04
Propyl Alcohol CH3CH2CH2OH 10.22
n-propyl nitrate C3H7NO3 11.07
Propylene Dichloride CH3CHClCH2Cl 10.87
Propylene Imine-skin C3H7N 9.00
Propylene oxide CH3CHOCH2 10.26
Pyridine C5H5N 9.25
Quinone OC6H40 10.04
Stibine SbH3 9.51
Styrene C6H5CHCH2 8.40
Sulfur dioxide SO2 12.30
Sulfur Hexafluoride SF6 15.33
Sulfur Monochloride S2Cl2 9.66
Sulfuryl Fluoride SO2F2 13.00
o-Terphenyls Cl8H14 7.78
1,1,2,2-tetrachloro-1,2-difluoroethane(freon 112) CCl2FCCl2F 11.30
1,1,2,2-Tetrachloroethane-skin CHCl2CHCl2 11.62
Tetra Ethyl lead-skin Pb(C2H5)4 11.10
Tetrahydrofuran C4H8O 9.41
Tetramethyl lead-skin Pb(CH3)4 8.50
Toluene C6H5CH3 8.82
o-Toluidine-skin CH3C6H4NH2 7.44
1,1,2-trichloroethane-skin CHCl2CH2Cl 11.00
Trichloroethylene CHClCCl2 9.47
1,1,2-Trichloro-1,2,2-Triflouroethane(freon 113) CCl2FCClF2 11.89
Triethylamine (C2H5)3N 7.50
Trifluoromonobromo-methane(freon 13B1) CBrF3 11.40
Trinitrotoluene(TNT)-skin CH3C6H2(NO2)3 10.59
Vinyl chloride C2H3Cl 9.99
o-Vinyl toluene CH3C6H4CHCH2 8.20
1,2-Xylene(Xylol) C6H4(CH3)2 8.45
2,4-Xylidine-skin (CH3)2C6H3NH2 7.65

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