Dipotassium
- Formula: K2
- Molecular weight: 78.1966
- IUPAC Standard InChI: InChI=1S/2K
- IUPAC Standard InChIKey: ZDHURYWHEBEGHO-UHFFFAOYSA-N
- CAS Registry Number: 25681-80-5
- 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:
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) | 4.062 ± 0.0015 | eV | N/A | N/A | L |
Electron affinity determinations
| EA (eV) | Method | Reference | Comment |
|---|---|---|---|
| 0.497 ± 0.012 | LPES | Eaton, Sarkas, et al., 1992 | Vertical Detachment Energy: 0.550±0.010 eV.; B |
| 0.493 ± 0.012 | LPES | McHugh, Eaton, et al., 1989 | Vertical Detachment Energy: 0.550±0.010 eV; B |
Ionization energy determinations
| IE (eV) | Method | Reference | Comment |
|---|---|---|---|
| 4.0637 ± 0.0002 | PI | Kappes, Radi, et al., 1985 | LBLHLM |
| 4.0637 ± 0.0003 | PI | Broyer, Chevaleyre, et al., 1985 | LBLHLM |
| 4.06075 ± 0.00015 | LS | Leutwyler, Hofmann, et al., 1981 | LLK |
| 4.059 ± 0.001 | LS | Herrmann, Schumacher, et al., 1978 | LLK |
| 4.0607 ± 0.0001 | PI | Herrmann, Schumacher, et al., 1978 | LLK |
| 4.05 ± 0.05 | PI | Herrmann, Schumacher, et al., 1978 | LLK |
| 4.059 ± 0.001 | PI | Herrmann, Leutwyler, et al., 1978 | LLK |
| 3.9 | EI | Zmbov, Wu, et al., 1977 | LLK |
| 4.0 ± 0.1 | PI | Foster, Leckenby, et al., 1969 | RDSH |
| ~4.1 | S | Robertson and Barrow, 1961 | RDSH |
Appearance energy determinations
| Ion | AE (eV) | Other Products | Method | Reference | Comment |
|---|---|---|---|---|---|
| K+ | 4.85 | K | PI | Herrmann, Leutwyler, et al., 1978 | LLK |
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.
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]
McHugh, Eaton, et al., 1989
McHugh, K.M.; Eaton, J.G.; Lee, G.H.; Sarkas, H.W.; Kidder, L.H.; Snodgrass, J.T.; Manaa, M.R.; Bowen, K.H.,
Photoelectron Spectra of the alkali metal cluster Anions: Na-,n=2-5, K-,n=2-7, Rb-,n=2-3, and Cs-,n=2-3,
J. Chem. Phys., 1989, 91, 6, 3792, https://doi.org/10.1063/1.456861
. [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]
Broyer, Chevaleyre, et al., 1985
Broyer, M.; Chevaleyre, J.; Delacretaz, G.; Fayet, P.; Woste, L.,
One- and two-photon ionization of alkaline clusters,
Surf. Sci., 1985, 156, 342. [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, Schumacher, et al., 1978
Herrmann, A.; Schumacher, E.; Woste, L.,
Preparation and photoionization potentials of molecules of sodium, potassium and mixed atoms,
J. Chem. Phys., 1978, 68, 2327. [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]
Robertson and Barrow, 1961
Robertson, E.W.; Barrow, R.F.,
Rotational analysis oi the C1πu-X1+g system of K2, and the ionisation potential of K2,
Proc. Chem. Soc., 1961, 329. [all data]
Notes
Go To: Top, Gas phase ion energetics data, References
- Symbols used in this document:
AE Appearance energy EA Electron affinity IE (evaluated) Recommended ionization energy - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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