Monopotassium monooxide


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.

Quantity Value Units Method Reference Comment
Δfgas17.00kcal/molReviewChase, 1998Data last reviewed in December, 1967
Quantity Value Units Method Reference Comment
gas,1 bar56.888cal/mol*KReviewChase, 1998Data last reviewed in December, 1967

Gas Phase Heat Capacity (Shomate Equation)

Cp° = A + B*t + C*t2 + D*t3 + E/t2
H° − H°298.15= A*t + B*t2/2 + C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 − E/(2*t2) + G
    Cp = heat capacity (cal/mol*K)
    H° = standard enthalpy (kcal/mol)
    S° = standard entropy (cal/mol*K)
    t = temperature (K) / 1000.

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Temperature (K) 298. to 6000.
A 8.918421
B 0.247374
C -0.005562
D 0.000475
E -0.035223
F 14.21190
G 67.40990
H 17.00000
ReferenceChase, 1998
Comment Data last reviewed in December, 1967

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 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

Ionization energy determinations

IE (eV) Method Reference Comment
7.1 ± 0.1SButman, Kudin, et al., 1984LBLHLM
8.0 ± 1.0SFarber, Srivastava, et al., 1982LBLHLM
8. ± 1.EIEhlert, 1977LLK
7.1 ± 0.2EIEhlert, 1977LLK

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 January, 1977

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 (39)K16O
StateTeωeωexeωeyeBeαeγeDeβereTrans.ν00
A 2Π (347) 1 (442) 1        (2.33) 1  
X 2Σ+ 0 1 (384) 2        (2.22) 1  

Notes

1Ab initio calculation by So and Richards, 1975. The relative position of the two states is in accordance with results of a magnetic deflection analysis of M + NO2 scattering products (M = alkali metal) by Herm and Herschbach, 1970.
2Fundamental in solid nitrogen matrix Spiker and Andrews, 1973; the ab initio value is ωe = 467 cm-1 So and Richards, 1975.
3From a merging beam study of the reaction CO+ (K,C) KO+ Rol, Entemann, et al., 1974.

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.

Chase, 1998
Chase, M.W., Jr., NIST-JANAF Themochemical Tables, Fourth Edition, J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]

Butman, Kudin, et al., 1984
Butman, M.F.; Kudin, L.S.; Krasnov, K.S., The Mass-spectrometric determination of the proton affinity of the molecules M2O (M = Na, K, Rb, Cs), Russ. J. Inorg. Chem., 1984, 29, 1228, In original 2150. [all data]

Farber, Srivastava, et al., 1982
Farber, M.; Srivastava, R.D.; Moyer, J.W., Mass spectrometric determination of the thermodynamics of potassium hydroxide and minor potassium-containing species required in magnetohydrodynamic power systems, J. Chem. Thermodyn., 1982, 14, 1103. [all data]

Ehlert, 1977
Ehlert, T.C., Mass spectrometric investigations of the oxides of potassium, High Temp. Sci., 1977, 9, 237. [all data]

So and Richards, 1975
So, S.P.; Richards, W.G., The electronic ground states of alkali monoxides, Chem. Phys. Lett., 1975, 32, 227. [all data]

Herm and Herschbach, 1970
Herm, R.R.; Herschbach, D.R., Molecular beam kinetics: reactions of alkali atoms with NO2 and CH3NO2, J. Chem. Phys., 1970, 52, 5783. [all data]

Spiker and Andrews, 1973
Spiker, R.C., Jr.; Andrews, L., Matrix reactions of Na, K, Rb, and Cs atoms with N2O: infrared spectra geometries of K2O, Rb2O, and Cs2O, J. Chem. Phys., 1973, 58, 713. [all data]

Rol, Entemann, et al., 1974
Rol, P.K.; Entemann, E.A.; Wendell, K.L., Merging beams studies of Na, K, and Mg collisions with atmospheric ions, J. Chem. Phys., 1974, 61, 2050. [all data]


Notes

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