Methylidyne
- Formula: CH
- Molecular weight: 13.0186
- IUPAC Standard InChI: InChI=1S/CH/h1H
- IUPAC Standard InChIKey: VRLIPUYDFBXWCH-UHFFFAOYSA-N
- CAS Registry Number: 3315-37-5
- Chemical structure:
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Gas phase ion energetics data
Go To: Top, References, Notes
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:
B - John E. Bartmess
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
View reactions leading to CH+ (ion structure unspecified)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| IE (evaluated) | 10.64 ± 0.01 | eV | N/A | N/A | L |
Electron affinity determinations
| EA (eV) | Method | Reference | Comment |
|---|---|---|---|
| 1.260 ± 0.020 | N/A | Goebbert, 2012 | B |
| 1.2380 ± 0.0078 | LPES | Kasdan, Herbst, et al., 1975 | B |
| 0.740 ± 0.050 | PD | Feldman, 1970 | B |
| 2.60 ± 0.30 | EIAE | Locht and Momigny, 1970 | From CH4,C2H2,C2H4; B |
Ionization energy determinations
| IE (eV) | Method | Reference | Comment |
|---|---|---|---|
| 10.64 | EVAL | Huber and Herzberg, 1979 | LLK |
| 10.64 ± 0.01 | S | Herzberg and Johns, 1969 | RDSH |
De-protonation reactions
+
=
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| ΔrH° | 1529.4 ± 0.71 | kJ/mol | D-EA | Scheer, Bilodeau, et al., 1998 | gas phase; Given: 1.262119(20) eV; B |
| Quantity | Value | Units | Method | Reference | Comment |
| ΔrG° | 1506.2 ± 1.1 | kJ/mol | H-TS | Scheer, Bilodeau, et al., 1998 | gas phase; Given: 1.262119(20) eV; B |
References
Go To: Top, Gas phase ion energetics data, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Goebbert, 2012
Goebbert, D.J.,
Photoelectron imaging of CH-,
Chem. Phys. Lett., 2012, 551, 19-25, https://doi.org/10.1016/j.cplett.2012.08.065
. [all data]
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]
Feldman, 1970
Feldman, D.,
Photoablosung von Elektronen bei einigen Stabilen Negativen Ionen,
Z. Naturfor., 1970, 25A, 621. [all data]
Locht and Momigny, 1970
Locht, R.; Momigny, J.,
Mass Spectrometric Determination of the Electron Affinities of Radicals,
Chem. Phys. Lett., 1970, 6, 4, 273, https://doi.org/10.1016/0009-2614(70)85072-2
. [all data]
Huber and Herzberg, 1979
Huber, K.P.; Herzberg, G.,
Molecular Spectra and Molecular Structure. IV. Constants of Diatomic Molecules,, Van Nostrand Reinhold Co., 1979, ,1. [all data]
Herzberg and Johns, 1969
Herzberg, G.; Johns, J.W.C.,
New spectra of the CH molecule,
Astrophys. J., 1969, 158, 399. [all data]
Scheer, Bilodeau, et al., 1998
Scheer, M.; Bilodeau, R.C.; Brodie, C.A.; Haugen, H.K.,
Systematic study of the stable states of C-, Si-, Ge-, and Sn- via infrared laser spectroscopy,
Phys. Rev. A, 1998, 58, 4, 2844-2856, https://doi.org/10.1103/PhysRevA.58.2844
. [all data]
Notes
Go To: Top, Gas phase ion energetics data, References
- Symbols used in this document:
EA Electron affinity IE (evaluated) Recommended ionization energy ΔrG° Free energy of reaction at standard conditions ΔrH° Enthalpy of reaction at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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