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Potassium sodide

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 evaluated as indicated in comments:
L - Sharon G. Lias

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
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
B - John E. Bartmess

Quantity Value Units Method Reference Comment
IE (evaluated)4.41636 ± 0.00017eVN/AN/AL

Electron affinity determinations

EA (eV) Method Reference Comment
0.465 ± 0.030LPESEaton, Sarkas, et al., 1992Vertical Detachment Energy: 0.575±0.015 eV.; B

Ionization energy determinations

IE (eV) Method Reference Comment
4.4164 ± 0.0002PIKappes, Radi, et al., 1985LBLHLM
4.41636 ± 0.00017LSLeutwyler, Hofmann, et al., 1981LLK
4.52 ± 0.05PIHerrmann, Leutwyler, et al., 1978LLK
4.57 ± 0.20EIZmbov, Wu, et al., 1977LLK
4.5 ± 0.1PIFoster, Leckenby, et al., 1969RDSH

Appearance energy determinations

Ion AE (eV) Other Products MethodReferenceComment
K+4.96NaPIHerrmann, Leutwyler, et al., 1978LLK

Constants of diatomic molecules

Go To: Top, Gas phase ion energetics 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 March, 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 23Na39K
E 25228 1 95.85 H 0.94        E larrow X R 25214 H
Sinha, 1948
D (1Pi) 20090.6 82.17 H 0.350 -.00814       D larrow X R 20070.0 H
Loomis and Arvin, 1934; missing citation
C 1Pi 16993.8 71.33 Z 1.236 2 8.8E-3 0.05744 0.000078 3  32.1E-7 4  4.505 C larrow X R 16967.2 Z
Loomis and Arvin, 1934; missing citation; Allegrini, Moi, et al., 1977
A (1Sigma+) 12139.7 79.852 H 0.0872 -3.89E-3 5      A larrow X R 12118.0 H
Loomis and Arvin, 1934
X 1Sigma+ 0 124.134 Z 0.511 6  0.0905 0.0004584 7  8.19E-7 4  3.589 8  
Dagdigian and Wharton, 1972
magn. reson. 9
missing citation
Note: It now appears that the ground state constants of Toueg, 1974 are unreliable; the uncertainty also affects the new results for the C state Allegrini, Moi, et al., 1977 [Arimondo, private comm. 1978]


1Recalculated; Sinha, 1948 gives 25201 which must be erroneous.
2omegaeze = -0.000223. All constants obtained from a study of the C state vibrational-rotational structure by laser excitation and collision-induced dissociation Allegrini, Moi, et al., 1977. Similar vibrational constants have been derived by Loomis and Arvin, 1934 from absorption and magnetic rotation spectra; convergence limit at 18025 ± 250 cm-1 above X 1Sigma+(v=0), corresponding to Na(2S) + K(4p 2P).
3missing note
4Centrifuga1 distortion constants as given by Allegrini, Moi, et al., 1977 and Toueg, 1974; there is no agreement with De values calculated from 4Be3/omegae2.
5Perturbations (possibly by a 3Pi state) are very likely the cause for the appearance of a weak magnetic rotation spectrum.
6omegaexe= -7.9E-5(v+1/2)3 - 2.47E-7(v+1/2)4 - 2.50E-7(v+1/2)5 Toueg, 1974.
7alphav= -9.4E-7(v+1/2)2 - 9.08E-8(v+1/2)3 Toueg, 1974.
8Mol. beam re electric 12
9gJ = -0.0253 muN Brooks, Anderson, et al., 1972. For an NMR experiment using-optical pumping see Konig and Weber, 1976.
10Extrapolation of the vibrational levels in C 1Pi assuming that this state has no potential maximum.
11Photoionization appearance potential Foster, Leckenby, et al., 1969.
12muel(v=0) = 2.667 D [recalculated from mu02/B0 = 3.966E-19 cm3 Dagdigian and Wharton, 1972 with the new value for B0]. Electric quadrupole coupling constants Dagdigian and Wharton, 1972; see also Brooks, Anderson, et al., 1972.


Go To: Top, Gas phase ion energetics 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.

Eaton, Sarkas, et al., 1992
Eaton, J.G.; Sarkas, H.W.; Arnold, S.T.; Mchugh, K.M.; Bowen, K.H., Negative Ion Photoelectron Spectroscopy of the Heteronuclear Alkali-Metal Dimer and Trimer Anions - NaK-, KRb-, RbCS-, KCs-, Na2K-, and K2Cs, Chem. Phys. Lett., 1992, 193, 1-3, 141, https://doi.org/10.1016/0009-2614(92)85697-9 . [all data]

Kappes, Radi, et al., 1985
Kappes, M.M.; Radi, P.; Schar, M.; Schumacher, E., Photoionization measurements on dialkali monohalides generated in supersonic nozzle beams, Chem. Phys. Lett., 1985, 113, 243. [all data]

Leutwyler, Hofmann, et al., 1981
Leutwyler, S.; Hofmann, M.; Harri, H.-P.; Schumacher, E., The adiabatic ionization potentials of the alkali dimers Na2, NaK and K2, Chem. Phys. Lett., 1981, 77, 257. [all data]

Herrmann, Leutwyler, et al., 1978
Herrmann, A.; Leutwyler, S.; Schumacher, E.; Woste, L., 38. On metal-atom clusters IV. Photoionization thresholds and multiphoton ionization spectra of alkali-metal molecules, Helv. Chim. Acta, 1978, 61, 453. [all data]

Zmbov, Wu, et al., 1977
Zmbov, K.F.; Wu, C.H.; Ihle, H.R., A mass spectrometric study of heteronuclear diatomic alkali metal molecules. Dissociation energies ionization potentials of NaLi, KLi, NaK, J. Chem. Phys., 1977, 67, 4603. [all data]

Foster, Leckenby, et al., 1969
Foster, P.J.; Leckenby, R.E.; Robbins, E.J., The ionization potentials of clustered alkali metal atoms, J. Phys. B:, 1969, 2, 478. [all data]

Sinha, 1948
Sinha, S.P., Ultra-violet bands of NaK, Proc. Phys. Soc. London, 1948, 60, 447. [all data]

Loomis and Arvin, 1934
Loomis, F.W.; Arvin, M.J., The band spectrum of NaK, Phys. Rev., 1934, 46, 286. [all data]

Allegrini, Moi, et al., 1977
Allegrini, M.; Moi, L.; Armondo, E., Investigation of C1«PI» state in NaK molecules by laser excitation and collision-induced dissociation, Chem. Phys. Lett., 1977, 45, 245. [all data]

Dagdigian and Wharton, 1972
Dagdigian, P.J.; Wharton, L., Molecular beam electric deflection and resonance spectroscopy of the heteronuclear alkali dimers: 39K7Li, Rb7Li, 39K23Na, Rb23Na, and 133Cs23Na, J. Chem. Phys., 1972, 57, 1487. [all data]

Toueg, 1974
Toueg, Thesis, quoted by Allegrini, Moi, et al., 1977, University of Columbia, 1974, 1. [all data]

Brooks, Anderson, et al., 1972
Brooks, R.A.; Anderson, C.H.; Ramsey, N.F., Molecular beam experiments on KNa and LiNa, J. Chem. Phys., 1972, 56, 5193. [all data]

Konig and Weber, 1976
Konig, F.; Weber, H.G., NMR in Na2 and NaK by optical pumping, Chem. Phys. Lett., 1976, 44, 293. [all data]


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