Volatile Organic Compounds and other gases: A-B  C-D  E-H  I-O  P-Z 

GAS OR VAPOR	Ionization Potential(eV)
I
1-Iodo-2-methylpropane	9.18
1-Iodobutane	9.21
1-Iodopentane	9.19
1-Iodopropane	9.26
2-Iodobutane	9.09
2-Iodopropane	9.17
Iodine	9.28
Iodobenzene	8.73
Isobutane (Isobutylene)	9.4
Isobutyl acetate	9.97
Isobutyl alcohol	10.12
Isobutyl amine	8.7
Isobutyl formate	10.46
Isobutyraldehyde	9.74
Isobutyric acid	10.02
Isopentane	10.32
Isophorone	9.07
Isoprene	8.85
Isopropyl acetate	9.99
Isopropyl alcohol	10.16
Isopropyl amine	8.72
Isopropyl benzene	8.69
Isopropyl ether	9.2
Isovaleraldehyde	9.71
m-Iodotoluene	8.61
o-Iodotoluene	8.62
p-Iodotoluene	8.5
K
Ketene	9.61
L
2,3-Lutidine	8.85
2,4-Lutidine	8.85
2,6-Lutidine	8.85
M
2-Methyl furan	8.39
2-Methyl naphthalene	7.96
1-Methyl naphthalene	7.96
2-Methyl propene	9.23
2-Methyl-1-butene	9.12
2-Methylpentane	10.12
3-Methyl-1-butene	9.51
3-Methyl-2-butene	8.67
3-Methylpentane	10.08
4-Methylcyclohexene	8.91
Maleic anhydride	10.8
Mesityl oxide	9.08
Mesitylene	8.4
Methane	12.98
Methanethiol (methyl mercaptan)	9.44
Methyl acetate	10.27
Methyl acetylene	10.37
Methyl acrylate	9.9
Methyl alcohol	10.85
Methyl amine	8.97
Methyl bromide	10.54
Methyl butyl ketone	9.34
Methyl butyrate	10.07
Methyl cellosolve	9.6
Methyl chloride	11.28
Methyl chloroform (1,1,1- trichloroethane)	11
Methyl disulfide	8.46
Methyl ethyl ketone	9.53
Methyl formate	10.82
Methyl iodide	9.54
Methyl isobutyl ketone	9.3
Methyl isobutyrate	9.98
Methyl isocyanate	10.67
Methyl isopropyl ketone	9.32
Methyl isothiocyanate	9.25
Methyl mercaptan	9.44
Methyl methacrylate	9.7
Methyl propionate	10.15
Methyl propyl ketone	9.39
á -Methyl styrene	8.35
Methyl thiocyanate	10.07
Methylal (dimethoxymethane)	10
Methylcyclohexane	9.85
Methylene chloride	11.32
Methyl-n-amyl ketone	9.3
Monomethyl aniline	7.32
Monomethyl hydrazine	7.67
Morpholine	8.2
n-Methyl acetamide	8.9
N
1-Nitropropane	10.88
2-Nitropropane	10.71
Naphthalene	8.12
Nickel carbonyl	8.27
Nitric oxide, (NO)	9.25
Nitrobenzene	9.92
Nitroethane	10.88
Nitrogen	15.58
Nitrogen dioxide	9.78
Nitrogen trifluoride	12.97
Nitromethane	11.08
Nitrotoluene	9.45
p-Nitrochloro benzene	9.96
O
Octane	9.82
Oxygen	12.08
Ozone	12.08