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Section: 10 | Ionization Energies of Gas-Phase Molecules |
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How to Cite this Reference
The recommended form of citation is:
John R. Rumble, ed., CRC Handbook of Chemistry and Physics, 103rd Edition (Internet Version 2022), CRC Press/Taylor & Francis, Boca Raton, FL.
If a specific table is cited, use the format: "Physical Constants of Organic Compounds," in CRC Handbook of Chemistry and Physics, 103rd Edition (Internet Version 2022), John R. Rumble, ed., CRC Press/Taylor & Francis, Boca Raton, FL.

IONIZATION ENERGIES OF GAS-PHASE MOLECULES

Sharon G. Lias

This table presents values for the first ionization energies (IP) of approximately 1000 molecules and atoms. Substances are listed by name. Values designated as "approx." are considered not to be well established. Data appearing in the 1988 reference were updated in 1996 for inclusion in the database of ionization energies available at the Internet site of the Standard Reference Data program of the National Institute of Standards and Technology (http://webbook.nist.gov). The list appearing here includes these updates. Column definitions for the table are as follows.

Column heading Definition
Name Name of gas-phase molecule
Mol. form. Molecular formula of gas-phase molecule
IP First ionization energy, in eV
Uncert. Uncertainty in first ionization energy, in eV
ΔfHion  Enthalpy of formation of the ion at 298 K, in kJ mol-1

The list also includes values for enthalpies of formation of the ions at 298 K, ∆fHion, given according to the ion convention used in mass spectrometry; to convert these values to the electron convention used in thermodynamics analysis, add 6 kJ mol-1. Details on the calculation of ∆fHion, as well as data for a much larger number of molecules, may be found in the reference and on the NIST Internet site.

Reference

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Ionization Energies of Gas-Phase Molecules



NameSynonymMol. form.FormulaCAS Reg. No.Mol. wt.IP/eVUncert.ΔfHion/kJ mol-1
Continued on next page...
Acenaphthene1,2-DihydroacenaphthyleneC12H10C12H1083-32-9154.2077.75± 0.07903
AcenaphthyleneAcenaphthaleneC12H8C12H8208-96-8152.1928.22approx.1053
AcetaldehydeEthanalC2H4OCH3CHO75-07-044.05210.229± 0.0007821
AcetamideEthanamideC2H5NOCH3CONH260-35-559.0679.65± 0.03693
Acetic acidEthanoic acidC2H4O2CH3COOH64-19-760.05210.65± 0.02595
Acetic anhydrideAcetyl acetateC4H6O3C4H6O3108-24-7102.08910.0approx.398
Acetone2-PropanoneC3H6O(CH3)2CO67-64-158.0799.703± 0.006719
AcetonitrileMethyl cyanideC2H3NCH3CN75-05-841.05212.20± 0.011253
AcetophenoneMethyl phenyl ketoneC8H8OC6H5C=OCH398-86-2120.1499.29± 0.03810
Acetyl chlorideEthanoyl chlorideC2H3ClOCH3COCl75-36-578.49710.82± 0.04801
AcetyleneEthyneC2H2HC≡CH74-86-226.03711.400± 0.0021328
Acetyl fluorideEthanoyl fluorideC2H3FOCH3COF557-99-362.04211.5approx.667
Acrolein2-PropenalC3H4OCH2=CHCHO107-02-856.06310.103± 0.006900
Acrylamide2-PropenamideC3H5NOC3H5NO79-06-171.0789.5approx.720
Acrylic acid2-Propenoic acidC3H4O2C3H4O279-10-772.06310.60701
AcrylonitrilePropenenitrileC3H3NCH2=CHCN107-13-153.06310.91± 0.011237
ActiniumAcAc7440-34-82275.17905
AlleneC3H4CH2=C=CH2463-49-040.0649.692± 0.0041126
Allyl alcohol2-Propen-1-olC3H6OC3H6O107-18-658.0799.67± 0.05808


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