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CH radical anion


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: John E. Bartmess

Quantity Value Units Method Reference Comment
Deltafgas113.85 ± 0.23kcal/molR-EAKasdan, Herbst, et al., 1975 
Deltafgas151.40kcal/molEIAETrepka and Neuert, 1963From CH4

Reaction 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: John E. Bartmess

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Individual Reactions

CH- + Hydrogen cation = Methylene

By formula: CH- + H+ = CH2

Quantity Value Units Method Reference Comment
Deltar386.05 ± 0.44kcal/molD-EAKasdan, Herbst, et al., 1975gas phase
Quantity Value Units Method Reference Comment
Deltar379.29 ± 0.53kcal/molH-TSKasdan, Herbst, et al., 1975gas phase

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 compiled by: John E. Bartmess

Protonation reactions

CH- + Hydrogen cation = Methylene

By formula: CH- + H+ = CH2

Quantity Value Units Method Reference Comment
Deltar386.05 ± 0.44kcal/molD-EAKasdan, Herbst, et al., 1975gas phase
Quantity Value Units Method Reference Comment
Deltar379.29 ± 0.53kcal/molH-TSKasdan, Herbst, et al., 1975gas phase

Constants of diatomic molecules

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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: Klaus P. Huber and Gerhard H. Herzberg

Data collected through August, 1976

Symbols used in the table of constants
SymbolMeaning
State electronic state and / or symmetry symbol
Te minimum electronic energy (cm-1)
ωe vibrational constant – first term (cm-1)
ωexe vibrational constant – second term (cm-1)
ωeye vibrational constant – third term (cm-1)
Be rotational constant in equilibrium position (cm-1)
αe rotational constant – first term (cm-1)
γe rotation-vibration interaction constant (cm-1)
De centrifugal distortion constant (cm-1)
βe rotational constant – first term, centrifugal force (cm-1)
re internuclear distance (Å)
Trans. observed transition(s) corresponding to electronic state
ν00 position of 0-0 band (units noted in table)
Diatomic constants for 12CH-
StateTeomegaeomegaexeomegaeyeBealphaegammaeDebetaereTrans.nu00
a 1Delta (6828) (3000)        (1.10) 1  6815 2
Kasdan, Herbst, et al., 1975
X 3Sigma- 0 (3025)        (1.089) 1  

Notes

1Indirectly from a Franck-Condon analysis.
2T0,from the photodetachment spectrum of CH-.
3From D00(CH) and the electron affinities of CH [=I.P.(CH-) and C (1.268 eV).
4From laser photoelectron spectrometry of CH- Kasdan, Herbst, et al., 1975. A theoretical value by Cade, 1967 is 1.61 ± 0.3 eV.

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.

Kasdan, Herbst, et al., 1975
Kasdan, A.; Herbst, E.; Lineberger, W.C., Laser photoelectron spectrometry of CH2-, Chem. Phys. Lett., 1975, 31, 78. [all data]

Trepka and Neuert, 1963
Trepka, L.v.; Neuert, H., Uber die Entstehenung von Negativen Ionen aus einigen Kohlenwasserstoffen und Alkoholen durch Elektronenstoss, Z. Naturfor., 1963, 18A, 1295. [all data]

Cade, 1967
Cade, P.E., The electron affinities of the diatomic hydrides CH, NH, SiH and PH, Proc. Phys. Soc. London, 1967, 91, 842. [all data]


Notes

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