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Carbon monoxide 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
Deltafgas-238.5kJ/molEndoRefaey and Franklin, 1976G3MP2B3 calculations indicate an EA of ca.-1.6 eV, anion unbound

Constants of diatomic molecules

Go To: Top, Gas phase thermochemistry data, References, Notes

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 October, 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 12C16O-
StateTeomegaeomegaexeomegaeyeBealphaegammaeDebetaereTrans.nu00
F  1730 40        b 13.95 ev 1
Sanche and Schulz, 1972; Schulz, 1973
E           d 12.2 ev 1
Mazeau, Gresteau, et al., 1972; Sanche and Schulz, 1972; Schulz, 1973
D           d 11.3 ev 1
Mazeau, Gresteau, et al., 1972; Sanche and Schulz, 1972; Schulz, 1973
C 2Pi            10.7 ev 1
Comer and Read, 1971; Mazeau, Gresteau, et al., 1972; Sanche and Schulz, 1972; Schulz, 1973
            10.42 ev 1
Comer and Read, 1971; Sanche and Schulz, 1972; Schulz, 1973
StateTeomegaeomegaexeomegaeyeBealphaegammaeDebetaereTrans.nu00
B 2Sigma+  [1940]         e 10.04 ev 1
Comer and Read, 1971; Mazeau, Gresteau, et al., 1972; Sanche and Schulz, 1972; Schulz, 1973
A 2            6.0 ev 1
Wong and Schulz, 1974
X 2Pi 7            1.5 ev 1
Boness, Hasted, et al., 1968

Notes

1Energies in eV above X 1Sigma+(v=0) of CO+, all obtained as resonances in electron scattering experiments.
2Resonances with the vibrational level v-0,1,2 of a3Pi of CO, ascribed to a state of CO- with the same potential function as a3Pi.
3From D00(CO) and the electron affinities of CO (-1.5 eV) and 0 (+1.465 eV).
4Progression of six resonances, observed in electron transmission Sanche and Schulz, 1972 and electroionization Carbonneau and Marmet, 1973 experiments; vibrational numbering uncertain. Its "grandparent" is assumed to be the A 2Pi state of CO+, with the additional two electrons in a Rydberg orbital.
5Resonances in the excitation functions of CO, B 1Sigma+ and b 3Sigma+ Mazeau, Gresteau, et al., 1972, and in the electron transmission current Sanche and Schulz, 1972.
6Sharp resonance (width ~0.045 eV); v'=0 and 1. The parent states are b 3Sigma+ and B 1Sigma+ of CO. Decay into CO(X 1Sigma, a 3Pi, a' 3Sigma, A 1Pi) + e-, C + O-, and C- + O: see also Swanson, Celotta, et al., 1975.
7Very broad resonance, vibrational structure barely detectable.

References

Go To: Top, Gas phase thermochemistry data, Constants of diatomic molecules, Notes

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

Refaey and Franklin, 1976
Refaey, K.M.A.; Franklin, J.L., Endoergic ion-molecule-collision processes of negative ions. III. Collisions of I- on O2, CO and CO2, Int. J. Mass Spectrom. Ion Phys., 1976, 20, 19. [all data]

Sanche and Schulz, 1972
Sanche, L.; Schulz, G.J., Electron transmission spectroscopy: core-excited resonances in diatomic molecules, Phys. Rev. A: Gen. Phys., 1972, 6, 69. [all data]

Schulz, 1973
Schulz, G.J., Resonances in electron impact on diatomic molecules, Rev. Mod. Phys., 1973, 45, 423. [all data]

Mazeau, Gresteau, et al., 1972
Mazeau, J.; Gresteau, F.; Joyez, G.; Reinhardt, J.; Hall, R.I., Resonances in electron scattering from CO, J. Phys. B:, 1972, 5, 1890-1897. [all data]

Comer and Read, 1971
Comer, J.; Read, F.H., Resonance scattering of electrons from CO, J. Phys. B:, 1971, 4, 1678-1682. [all data]

Wong and Schulz, 1974
Wong, S.F.; Schulz, G.J., Electron impact near the a3«PI» state of CO: dipole-dominated resonances, Phys. Rev. Lett., 1974, 33, 3, 134-136. [all data]

Boness, Hasted, et al., 1968
Boness, M.J.W.; Hasted, J.B.; Larkin, I.W., Compound state electron spectra of simple molecules, Proc. R. Soc. London A, 1968, 305, 493-515. [all data]

Carbonneau and Marmet, 1973
Carbonneau, R.; Marmet, P., Negative and neutral autoionizing states detected in the electroionization curve in CO, Can. J. Phys., 1973, 51, 2202. [all data]

Swanson, Celotta, et al., 1975
Swanson, N.; Celotta, R.J.; Kuyatt, C.E.; Cooper, J.W., Resonant structure in electron impact excitation of CO near threshold, J. Chem. Phys., 1975, 62, 4880. [all data]


Notes

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