lanthanum
- Formula: La
- Molecular weight: 138.90547
- IUPAC Standard InChI: InChI=1S/La
- IUPAC Standard InChIKey: FZLIPJUXYLNCLC-UHFFFAOYSA-N
- CAS Registry Number: 7439-91-0
- Chemical structure:
This structure is also available as a 2d Mol file - Permanent link for this species. Use this link for bookmarking this species for future reference.
- Information on this page:
- Data at other public NIST sites:
- NIST Atomic Spectra Database - Lines Holdings (on physics web site)
- NIST Atomic Spectra Database - Levels Holdings (on physics web site)
- NIST Atomic Spectra Database - Ground states and ionization energies (on physics web site)
- Gas Phase Kinetics Database
- X-ray Photoelectron Spectroscopy Database, version 5.0
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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:
HL - Edward P. Hunter and Sharon G. Lias
L - Sharon G. Lias
Data compiled as indicated in comments:
LL - Sharon G. Lias and Joel F. Liebman
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
View reactions leading to La+ (ion structure unspecified)
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| IE (evaluated) | 5.5770 ± 0.0006 | eV | N/A | N/A | L |
| Quantity | Value | Units | Method | Reference | Comment |
| Proton affinity (review) | 242.1 | kcal/mol | N/A | Hunter and Lias, 1998 | HL |
| Quantity | Value | Units | Method | Reference | Comment |
| Gas basicity | 237.1 | kcal/mol | N/A | Hunter and Lias, 1998 | HL |
Electron affinity determinations
| EA (eV) | Method | Reference | Comment |
|---|---|---|---|
| 0.470 ± 0.020 | LPES | Covington, Calabrese, et al., 1998 | B |
Ionization energy determinations
| IE (eV) | Method | Reference | Comment |
|---|---|---|---|
| 5.5770 | EVAL | Lide, 1992 | LL |
| 5.51 ± 0.09 | EI | Rauh and Ackermann, 1979 | LLK |
| 5.5 ± 0.7 | EI | Haque, Pelino, et al., 1979 | LLK |
| 5.5770 ± 0.0006 | S | Martin, Zalubas, et al., 1978 | LLK |
| 5.6 ± 0.1 | EI | Rauh and Ackermann, 1975 | LLK |
| 5.5 ± 0.2 | EI | Rauh and Ackermann, 1974 | LLK |
| 6.9 ± 1.2 | EI | Cocke, Gingerich, et al., 1973 | LLK |
| 5.5770 | S | Moore, 1970 | RDSH |
| 5.55 ± 0.05 | SI | Hertel, 1968 | RDSH |
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.
Hunter and Lias, 1998
Hunter, E.P.; Lias, S.G.,
Evaluated Gas Phase Basicities and Proton Affinities of Molecules: An Update,
J. Phys. Chem. Ref. Data, 1998, 27, 3, 413-656, https://doi.org/10.1063/1.556018
. [all data]
Covington, Calabrese, et al., 1998
Covington, A.M.; Calabrese, D.; Thompson, J.S.; Kvale, T.J.,
Measurement of the electron affinity of lanthanum,
J. Phys. B: Atom. Mol. Opt. Phys., 1998, 31, 20, L855-L860, https://doi.org/10.1088/0953-4075/31/20/002
. [all data]
Lide, 1992
Lide, D.R. (Editor),
Ionization potentials of atoms and atomic ions
in Handbook of Chem. and Phys., 1992, 10-211. [all data]
Rauh and Ackermann, 1979
Rauh, E.G.; Ackermann, R.J.,
The first ionization potentials of the transition metals,
J. Chem. Phys., 1979, 70, 1004. [all data]
Haque, Pelino, et al., 1979
Haque, R.; Pelino, M.; Gingerich, K.A.,
Investigation of the thermodynamic stability of the molecule LaIr(g) by high temperature mass spectrometry,
J. Chem. Phys., 1979, 71, 2929. [all data]
Martin, Zalubas, et al., 1978
Martin, W.C.; Zalubas, R.; Hagan, L.,
Atomic energy levels - the rare earth elements,
Natl. Stand. Ref. Data Ser. (U.S. Natl. Bur. Stand.), 1978, 60. [all data]
Rauh and Ackermann, 1975
Rauh, E.G.; Ackermann, R.J.,
The first ionization potentials of neptunium and neptunium monoxide,
J. Chem. Phys., 1975, 62, 1584. [all data]
Rauh and Ackermann, 1974
Rauh, E.G.; Ackermann, R.J.,
First ionization potentials of some refractory oxide vapors,
J. Chem. Phys., 1974, 60, 1396. [all data]
Cocke, Gingerich, et al., 1973
Cocke, D.L.; Gingerich, K.A.; Kordis, J.,
Determination of the high bond dissociation energy of the molecule LaRh,
High Temp. Sci., 1973, 5, 474. [all data]
Moore, 1970
Moore, C.E.,
Ionization potentials and ionization limits derived from the analyses of optical spectra,
Natl. Stand. Ref. Data Ser., (U.S. Natl. Bur. Stand.), 1970, 34, 1. [all data]
Hertel, 1968
Hertel, G.R.,
Surface ionization. III. The first ionization potentials of the lanthanides,
J. Chem. Phys., 1968, 48, 2053. [all data]
Notes
Go To: Top, Gas phase ion energetics data, References
- Symbols used in this document:
EA Electron affinity IE (evaluated) Recommended ionization energy - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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