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Potassium fluoride

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
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 39K19F
The electron energy loss spectrum Geiger and Pfeiffer, 1968 has peaks at 6.8, 8.5, 9.6 and 18.4, 22.5, 23.8,24.9 eV.
A 1           A larrow X 
Barrow and Caunt, 1953
X 1Sigma+ 0 428 2 (2.4)  0.279937413 2.335038E-3 3  0.04834E-5 4  2.171457 5  
Ritchie and Lew, 1964; Baikov and Vasilevskii, 1967
Rotation sp.
Grabner and Hughes, 1950; Green and Lew, 1960; Veazey and Gordy, 1965; Dijkerman, Flegel, et al., 1972
Mol. beam rf electric 6
Bonczyk and Hughes, 1967; missing citation; Van Wachem, De Leeuw, et al., 1967
and magn. reson. 7
Mehran, Brooks, et al., 1966


1Fluctuation bands, 34300 - 46700 cm-1 (absorption).
2From the IR spectrum Ritchie and Lew, 1964, Baikov and Vasilevskii, 1967. Veazey and Gordy, 1965, applying the Dunham theory to the microwave results, calculate omegae = 426.04 Veazey and Gordy, 1965 and omegaexe = 2.43 Veazey and Gordy, 1965.
3missing note
4missing note
5Rot.-vibr. sp. 9
6muel[D] = 8.5583 + 0.06841(v+1/2) + 0.000256(v+1/2)2 Graff and Runolfsson, 1963,105, electric quadrupole and other hyperfine coupling constants Schlier, 1957, Bonczyk and Hughes, 1967, missing citation; see also Grabner and Hughes, 1950, Green and Lew, 1960.
7gJ = (-)0.0364 muN Mehran, Brooks, et al., 1966.
8Thermochemical value Brewer and Brackett, 1961, Bulewicz, Phillips, et al., 1961; an upper limit, D00 leq 5.28eV, was derived Barrow and Caunt, 1953, from the analysis of the fluctuation bands.
9IR spectrum of matrix isolated KF Ismail, Hauge, et al., 1973.
10missing note


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

Geiger and Pfeiffer, 1968
Geiger, J.; Pfeiffer, H.-C., Untersuchung der Anregung innerer Elektronen von Alkalihalogenidmolekulen im Energieverlustspektrum von 25 keV-Elektronen, Z. Phys., 1968, 208, 105. [all data]

Barrow and Caunt, 1953
Barrow, R.F.; Caunt, A.D., The ultra-violet absorption spectra of some gaseous alkali-metal halides and the dissociation energy of fluorine, Proc. R. Soc. London A, 1953, 219, 120. [all data]

Ritchie and Lew, 1964
Ritchie, R.K.; Lew, H., Infrared spectra of NaF and KF, Can. J. Phys., 1964, 42, 43. [all data]

Baikov and Vasilevskii, 1967
Baikov, V.I.; Vasilevskii, K.P., Infrared spectra of sodium, potassium, rubidium, and cesium fluoride vapors, Opt. Spectrosc. Engl. Transl., 1967, 22, 198, In original 364. [all data]

Grabner and Hughes, 1950
Grabner, L.; Hughes, V., The radiofrequency spectrum of K39F by the electric resonance method, Phys. Rev., 1950, 79, 819. [all data]

Green and Lew, 1960
Green, G.W.; Lew, H., Rotational spectrum of K39F by the molecular beam electric resonance method, Can. J. Phys., 1960, 38, 482. [all data]

Veazey and Gordy, 1965
Veazey, S.E.; Gordy, W., Millimeter-wave molecular-beam spectroscopy: alkali fluorides, Phys. Rev. A: Gen. Phys., 1965, 138, 1303. [all data]

Dijkerman, Flegel, et al., 1972
Dijkerman, H.; Flegel, W.; Graff, G.; Monter, B., Beitrage zum Stark-Effekt der molekule 205Tl19F und 39K19F, Z. Naturforsch. A, 1972, 27, 100. [all data]

Bonczyk and Hughes, 1967
Bonczyk, P.A.; Hughes, V.W., Hyperfine structure of the v=O, J=l state in Rb85F, Rb87F, K39F, and K41F by the molecular-beam electric-resonance method, Phys. Rev., 1967, 161, 15. [all data]

Van Wachem, De Leeuw, et al., 1967
Van Wachem, R.; De Leeuw, F.H.; Dymanus, A., Dipole moments of KF and KBr measured by the molecular-beam electric-resonance method, J. Chem. Phys., 1967, 47, 2256. [all data]

Mehran, Brooks, et al., 1966
Mehran, F.; Brooks, R.A.; Ramsey, N.F., Rotational magnetic moments of alkali-halide molecules, Phys. Rev., 1966, 141, 93. [all data]

Graff and Runolfsson, 1963
Graff, G.; Runolfsson, O., Gleichzeitige Messung von Hyperfeinstruktur, Stark-Effekt und Zeeman-Effekt des 39K19F mit einer Molekulstrahlresonanzapparatur, Z. Phys., 1963, 176, 90. [all data]

Schlier, 1957
Schlier, C., Messung der Hyperfeinstruktur des Kaliumfluorids mit der Molekulstrahlresonanzmethode, Z. Phys., 1957, 147, 600. [all data]

Brewer and Brackett, 1961
Brewer, L.; Brackett, E., The dissociation energies of gaseous alkali halides, Chem. Rev., 1961, 61, 425. [all data]

Bulewicz, Phillips, et al., 1961
Bulewicz, E.M.; Phillips, L.F.; Sugden, T.M., Determination of dissociation constants and heats of formation of simple molecules by flame photometry. Part 8. Stabilities of the gaseous diatomic halides of certain metals, Trans. Faraday Soc., 1961, 57, 921. [all data]

Ismail, Hauge, et al., 1973
Ismail, Z.K.; Hauge, R.H.; Margrave, J.L., Infrared spectra of sodium and potassium fluorides by matrix isolation, J. Inorg. Nucl. Chem., 1973, 35, 3201. [all data]


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