Appearance Potentials

 

Ionisation Energies of Simple Inorganic and Organic Molecules.

Hiden quadrupole mass-spectrometers can simplify the analysis of complex cracking patterns from multi-component gas / vapour mixtures by using "Soft Ionisation". This method provides controlled ionisation to facilitate mass analysis and species discrimination / identification. The table below lists the appearance potential or first ionisation energies of simple inorganic and organic molecules.

 

 nitrogen N2 oxygen O2 argon Ar carbon monoxide CO

carbon dioxide CO2

ammonia NH3 nitric oxiide NO methane CH4

I.E. (eV)

15.58
12.07
15.76
14.01
13.77
10.07
9.26
12.61
 ethyne C2H2 ethene C2H4 ethane C2H6 ethanol C2H5OH acetic acid CH3COOH IPA C3H7OH propanal C2H5CHO acetone CH3COCH3

I.E. (eV)

11.40
10.51
11.56
10.83
10.65
10.17
9.96
9.70
 ether CH30CH3 benzene C6H6 n-hexane C6H14

cyclo- hexane C6H12

methanol CH3OH

formic acid HCOOH form- aldehyde HCHO carbon tetrachloride CCl4

I.E. (eV)

9.72
9.24
10.13
9.86
10.85
11.33
10.88
11.47