Methane, diiodo-

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Gas phase thermochemistry data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein

Quantity Value Units Method Reference Comment
Δfgas28.1 ± 1.0kcal/molCmKudchadker and Kudchadker, 1976 
Δfgas29.2 ± 1.0kcal/molEqkFuruyama, Golden, et al., 1968 

Gas phase ion energetics data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data evaluated as indicated in comments:
L - Sharon G. Lias

Data compiled as indicated in comments:
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
LL - Sharon G. Lias and Joel F. Liebman

Quantity Value Units Method Reference Comment
IE (evaluated)9.46 ± 0.02eVN/AN/AL

Ionization energy determinations

IE (eV) Method Reference Comment
9.46 ± 0.02PITsai, Baer, et al., 1975LLK
9.46PEVon Niessen, Asbrink, et al., 1982Vertical value; LBLHLM
9.46PEPotts, Lempka, et al., 1970Vertical value; RDSH

Appearance energy determinations

Ion AE (eV) Other Products MethodReferenceComment
CH2I+10.42IEIHolmes, Lossing, et al., 1988LL
CH2I+10.55 ± 0.02IPITsai, Baer, et al., 1975LLK
I+13.2 ± 0.1CH2IEIDeCorpo, Bafus, et al., 1971LLK
I+13.8CH2IEIFranklin and Haney, 1970RDSH

Gas Chromatography

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: NIST Mass Spectrometry Data Center, William E. Wallace, director

Kovats' RI, non-polar column, isothermal

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Column type Active phase Temperature (C) I Reference Comment
PackedOV-1100.903.Castello and Gerbino, 1988He, Chromosorb W DMCS; Column length: 3. m
PackedOV-1125.911.Castello and Gerbino, 1988He, Chromosorb W DMCS; Column length: 3. m
PackedOV-175.895.Castello and Gerbino, 1988He, Chromosorb W DMCS; Column length: 3. m

Kovats' RI, polar column, isothermal

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Column type Active phase Temperature (C) I Reference Comment
PackedSP-1000100.1510.47Castello and Gerbino, 1988He, Chromosorb W DMCS; Column length: 3. m
PackedSP-1000125.1522.18Castello and Gerbino, 1988He, Chromosorb W DMCS; Column length: 3. m

Van Den Dool and Kratz RI, non-polar column, temperature ramp

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Column type Active phase I Reference Comment
CapillaryDB-1876.Helmig and Greenberg, 199560. m/0.33 mm/0.25 μm, 6. K/min; Tstart: -50. C; Tend: 180. C

Normal alkane RI, non-polar column, custom temperature program

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Column type Active phase I Reference Comment
CapillaryDB-1878.Helmig and Greenberg, 199560. m/0.33 mm/0.25 μm; Program: not specified

References

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Kudchadker and Kudchadker, 1976
Kudchadker, S.A.; Kudchadker, A.P., Erratum: Ideal gas thermodynamic properties of eight bromo- and iodomethanes, J. Phys. Chem. Ref. Data, 1976, 5, 529-530. [all data]

Furuyama, Golden, et al., 1968
Furuyama, S.; Golden, D.M.; Benson, S.W., The thermochemistry of the gas-phase equilibrium 2CH3I = CH4 + CH2i2. The heat of formation of CH2I2, J. Phys. Chem., 1968, 72, 4713-4715. [all data]

Tsai, Baer, et al., 1975
Tsai, B.P.; Baer, T.; Werner, A.S.; Lin, S.F., A photoelectron-photoion coincidence study of the ionization and fragment appearance potentials of bromo- and iodomethanes, J. Phys. Chem., 1975, 79, 570. [all data]

Von Niessen, Asbrink, et al., 1982
Von Niessen, W.; Asbrink, L.; Bieri, G., 30.4 nm He(II) Photoelectron spectra of organic molecules. Part VI. Halogeno-compounds (C,H,X: X = Cl, Br, I), J. Electron Spectrosc. Relat. Phenom., 1982, 26, 173. [all data]

Potts, Lempka, et al., 1970
Potts, A.W.; Lempka, H.J.; Streets, D.G.; Price, W.C., Photoelectron spectra of the halides of elements in groups III, IV, V and VI, Phil. Trans. Roy. Soc. (London), 1970, A268, 59. [all data]

Holmes, Lossing, et al., 1988
Holmes, J.L.; Lossing, F.P.; McFarlane, R.A., Stabilization energy and positional effects in halogen-substituted alkyl ions., Int. J. Mass Spectrom. Ion Phys., 1988, 86, 209. [all data]

DeCorpo, Bafus, et al., 1971
DeCorpo, J.J.; Bafus, D.A.; Franklin, J.L., Enthalpies of formation of the monohalomethyl radicals from mass spectrometric studies of the dihalomethanes, J. Chem. Thermodyn., 1971, 3, 125. [all data]

Franklin and Haney, 1970
Franklin, J.L.; Haney, M.A., Energy distribution in ionic decomposition processes, Recent Developments in Mass Spectroscopy, ed. K. Ogata and T. Hayakawa Baltimore Univ. Park Press, Baltimore, MD, 1970, 909. [all data]

Castello and Gerbino, 1988
Castello, G.; Gerbino, T.C., Effect of Temperature on the Gas Chromatographic Separation of Halogenated Compounds on Polar and Non-Polar Stationary Phases, J. Chromatogr., 1988, 437, 33-45, https://doi.org/10.1016/S0021-9673(00)90369-8 . [all data]

Helmig and Greenberg, 1995
Helmig, D.; Greenberg, J., Artifact formation from the use of potassium-iodide-based ozone traps during atmospheric sampling of trace organic gases, J. Hi. Res. Chromatogr., 1995, 18, 1, 15-18, https://doi.org/10.1002/jhrc.1240180105 . [all data]


Notes

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