europium oxide

Formula: EuO
Molecular weight: 167.963
CAS Registry Number: 12020-60-9
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Gas phase ion energetics data

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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
6.5 ± 0.5	EI	Balducci, Gigli, et al., 1985	LBLHLM
6.7 ± 0.5	EI	Balducci, Gigli, et al., 1981	LLK
6.3 ± 0.8	EI	Kordis and Gingerich, 1977	LLK
6.2	EI	Hildenbrand, 1977	LLK
6.3 ± 0.2	EI	Murad and Hildenbrand, 1976	LLK
6.5 ± 0.1	EI	Ackermann, Rauh, et al., 1976	LLK

Constants of diatomic molecules

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Data compiled by: Klaus P. Huber and Gerhard H. Herzberg

Data collected through October, 1975

Symbols used in the table of constants
Symbol	Meaning
State	electronic state and / or symmetry symbol
T_e	minimum electronic energy (cm^-1)
ω_e	vibrational constant – first term (cm^-1)
ω_ex_e	vibrational constant – second term (cm^-1)
ω_ey_e	vibrational constant – third term (cm^-1)
B_e	rotational constant in equilibrium position (cm^-1)
α_e	rotational constant – first term (cm^-1)
γ_e	rotation-vibration interaction constant (cm^-1)
D_e	centrifugal distortion constant (cm^-1)
β_e	rotational constant – first term, centrifugal force (cm^-1)
r_e	internuclear distance (Å)
Trans.	observed transition(s) corresponding to electronic state
ν₀₀	position of 0-0 band (units noted in table)

Diatomic constants for ⁽¹⁵³⁾Eu¹⁶O
State	T_e	ω_e
Emission spectrum from 14000 to 25000 cm^-1.
↳missing citation; Edelstein, Eckstrom, et al., 1974; Dickson and Zare, 1975
X	0	[668.0] 1
X	↳Gabelnick, Reedy, et al., 1974

Notes

In Ar matrix at 15 K. For Eu¹⁸O at 633.7 cm^-1. Derived constants are ω_e= 671.₈ Gabelnick, Reedy, et al., 1974, ω_ex_e= 1.9 Gabelnick, Reedy, et al., 1974.

Thermochemical value (mass-spectrom.) Hildenbrand and Murad, 1975. Considerably higher values (5.7₂ eV) in Ames, Walsh, et al., 1967, Smoes, Coppens, et al., 1969, Dickson and Zare, 1975.

References

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Balducci, Gigli, et al., 1985
Balducci, G.; Gigli, G.; Guido, M., Mass spectrometric study of the thermochemistry of gaseous EuTiO₃ and TiO₂, J. Chem. Phys., 1985, 83, 1909. [all data]

Balducci, Gigli, et al., 1981
Balducci, G.; Gigli, G.; Guido, M., Dissociation energies of the molecules CrPO₂(g) and CoO(g) by high-temperature mass spectrometry, J. Chem. Soc. Faraday Trans. 2, 1981, 77, 1107. [all data]

Kordis and Gingerich, 1977
Kordis, J.; Gingerich, K.A., Mass spectrometric observations of some polyatomic gaseous rare earth oxides their atomization energies, J. Chem. Phys., 1977, 66, 483. [all data]

Hildenbrand, 1977
Hildenbrand, D.L., Dissociation energy of samarium monoxide and its relation to that of europium monoxide, Chem. Phys. Lett., 1977, 48, 340. [all data]

Murad and Hildenbrand, 1976
Murad, E.; Hildenbrand, D.L., Thermochemical properties of gaseous EuO, J. Chem. Phys., 1976, 65, 3250. [all data]

Ackermann, Rauh, et al., 1976
Ackermann, R.J.; Rauh, E.G.; Thorn, R.J., The thermodynamics of ionization of gaseous oxides; the first ionization potentials of the lanthanide metals and monoxides, J. Chem. Phys., 1976, 65, 1027. [all data]

Edelstein, Eckstrom, et al., 1974
Edelstein, S.A.; Eckstrom, D.J.; Perry, B.E.; Benson, S.W., Chemiluminescence studies. III. Pressure dependent photon yields for several metal-N₂O reactions, J. Chem. Phys., 1974, 61, 11, 4932-4933. [all data]

Dickson and Zare, 1975
Dickson, C.R.; Zare, R.N., Beam-gas chemiluminescent reactions of Eu and Sm with O₃, N₂O, NO₂ and F₂, Chem. Phys., 1975, 7, 361. [all data]

Gabelnick, Reedy, et al., 1974
Gabelnick, S.D.; Reedy, G.T.; Chasanov, M.G., Infrared spectra and structure of some matrix-isolated lanthanide and actinide oxides, J. Chem. Phys., 1974, 60, 3, 1167, https://doi.org/10.1063/1.1681128 . [all data]

Hildenbrand and Murad, 1975
Hildenbrand, D.L.; Murad, E., Redetermination of the dissociation energy of europium monoxide and its bearing on atmospheric release experiments, Z. Naturforsch. A, 1975, 30, 1087-1089. [all data]

Ames, Walsh, et al., 1967
Ames, L.L.; Walsh, P.N.; White, D., Rare earths. IV. Dissocaition energies of the gaseous monoxides of the rare earths, J. Phys. Chem., 1967, 71, 2707. [all data]

Smoes, Coppens, et al., 1969
Smoes, S.; Coppens, P.; Bergman, C.; Drowart, J., Mass spectrometric determination of the dissociation energies of the gaseous rare earth monosulphides, Trans. Faraday Soc., 1969, 65, 682. [all data]

Notes

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Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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