Strontium monoxide

Formula: OSr
Molecular weight: 103.62
IUPAC Standard InChI: InChI=1S/O.Sr
IUPAC Standard InChIKey: UFQXGXDIJMBKTC-UHFFFAOYSA-N
CAS Registry Number: 1314-11-0
Chemical structure:
This structure is also available as a 2d Mol file
Other names: strontium oxide
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Gas phase ion energetics data

Go To: Top, Constants of diatomic molecules, References, Notes

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
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

Quantity	Value	Units	Method	Reference	Comment
IE (evaluated)	6.6 ± 0.2	eV	N/A	N/A	L
Quantity	Value	Units	Method	Reference	Comment
Proton affinity (review)	289.0	kcal/mol	N/A	Hunter and Lias, 1998	HL
Quantity	Value	Units	Method	Reference	Comment
Gas basicity	282.19	kcal/mol	N/A	Hunter and Lias, 1998	HL

Ionization energy determinations

IE (eV)	Method	Reference	Comment
6.60 ± 0.18	END/DER	Dalleska and Armentrout, 1994	LL
6.4 ± 0.25	EVAL	Belyaev, Gotkis, et al., 1990	LL
6.60 ± 0.05	PE	Dyke, Feher, et al., 1987	LBLHLM
7.0 ± 0.15	DER	Murad, 1983	LBLHLM
7.0 ± 0.2	EI	Murad, 1981	LLK
7. ± 1.	EI	Farber and Srivastava, 1976	LLK
6.1	EI	Drowart, Exsteen, et al., 1964	RDSH
6.91 ± 0.02	PE	Dyke, Feher, et al., 1987	Vertical value; LBLHLM

Constants of diatomic molecules

Go To: Top, Gas phase ion energetics data, References, Notes

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

Data collected through September, 1977

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 ⁸⁸Sr¹⁶O
State	T_e	ω_e	ω_ex_e	ω_ey_e	B_e	α_e	γ_e	D_e	β_e	r_e	Trans.	ν₀₀
C ¹Σ⁺	28632.7	480.2 Z	2.6		0.2742 1	0.0021		3.5E-7		2.131	C → X 2 R	28546.4₃ Z
C ¹Σ⁺	↳Mahanti, 1932; missing citation
B ¹Π	24701.0	519.9₁ Z	3.2₄		0.2937	0.0015		5.0E-₇		2.059	B → X 2 R	24634.4 Z
B ¹Π	↳Mahanti, 1932; missing citation; Deezsi, Koczkas, et al., 1954
Unclassified bands in the regions 14700 - 15700 and 16600 - 16900 cm^-1. The emitter of these bands has long been in doubt Charton and Gaydon, 1956 Pearse and Gaydon, 1976; in flames, and in arcs in water vapour, strong bands attributed to SrOH ocur in the same regions Lagerqvist and Huldt, 1955 Huldt and Lagerqvist, 1956. The bands have recently been observed in dry Sr + N₂O + CO (or N₂) flames, both in emission and in absorption Benard, Slafer, et al., 1977 Eckstrom, Barker, et al., 1977 missing citation*, and have tentatively been attributed to the transitions ³Δ ↔ a ³Π and ¹Δ, ¹Σ^- ↔ A' ¹Π or SrO.
A ¹Σ⁺	10886.59	619.5₈ Z	0.8₉ 3		0.3047₁ 4	0.0011₂		3.2E-7		2.021₉	A → X 5 R	10870.40 Z
A ¹Σ⁺	↳missing citation; missing citation; Almkvist and Lagerqvist, 1950; missing citation; missing citation; Brewer and Hauge, 1968
State	T_e	ω_e	ω_ex_e	ω_ey_e	B_e	α_e	γ_e	D_e	β_e	r_e	Trans.	ν₀₀
A' ¹Π	9400	472.₈ 6 H	2.06		0.256₅ 7	0.0017				2.20₄	A' → X R	9310 H
A' ¹Π	↳Capelle, Broida, et al., 1975; Hecht, 1976
a ³Π_i	9149 8	463.5	1.61		0.2584	0.0020				2.196
X ¹Σ⁺	0	653.4₉ Z	3.96		0.33798₀	0.00219₄		3.6E-7		1.91983 9
X ¹Σ⁺	↳Ault and Andrews, 1975
Microwave and rf sp. 10 11
↳Kaufman, Wharton, et al., 1965

Notes

In nitrogen matrices.

RKR Franck-Condon factors Liszt and Smith, 1971.

Bandheads in the region 8959-9166 cm^-1, originally Lagerqvist and Selin, 1956 attributed to a new system of SrO, have been shown Brewer and Hauge, 1968 to belong to the A → X 0-3 sequence.

Numerous perturbations by levels of a ³Π_i and A' ¹Π Almkvist and Lagerqvist, 1950, Field, 1974.

Franck-Condon factors Nicholls, 1962.

Vibrational numbering Capelle, Broida, et al., 1975 confirmed by isotope studies Hecht, 1976.

The rotational constants have been derived Capelle, Broida, et al., 1975 with the help of information gained from the analysis of perturbations in A ¹Σ⁺ Almkvist and Lagerqvist, 1950, Field, 1974.

A = -70; all constants for this state derived by Field, 1974 from perturbations in A ¹Σ⁺ Almkvist and Lagerqvist, 1950.

IR SPectrum 13

By the molecular beam electric resonance method. μ_el = 8.913 -0.026(v+1/2) D Kaufman, Wharton, et al., 1965.

Ab initio calculations of various ground state properties Yoshimine, 1968.

From the appearance threshold of SrO in a crossed-beam

missing note

References

Go To: Top, Gas phase ion energetics data, Constants of diatomic molecules, Notes

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]

Dalleska and Armentrout, 1994
Dalleska, N.F.; Armentrout, P.B., Guided ion beam studies of reactions of alkaline earth ions with O₂, Int. J. Mass Spectrom. Ion Processes, 1994, 134, 203. [all data]

Belyaev, Gotkis, et al., 1990
Belyaev, V.N.; Gotkis, I.S.; Lebedeva, N.L.; Krasnov, K.S., Ionization potentials of MX molecules (M = Ca, Sr, Ba; X = F, Cl, Br, I, OH, O), Russ. J. Phys. Chem., 1990, 64, 773. [all data]

Dyke, Feher, et al., 1987
Dyke, J.M.; Feher, M.; Gravenor, B.W.J.; Morris, A., High-temperature photoelectron spectroscopy: A study of the alkaline earth oxides SrO and BaO, J. Phys. Chem., 1987, 91, 4476. [all data]

Murad, 1983
Murad, E., Abstraction reactions of Ca⁺ and Sr⁺ ions, J. Chem. Phys., 1983, 78, 6611. [all data]

Murad, 1981
Murad, E., Thermochemical properties of the gaseous alkaline earth monohydroxides, J. Chem. Phys., 1981, 75, 4080. [all data]

Farber and Srivastava, 1976
Farber, M.; Srivastava, R.D., The dissociation energies of calcium oxide and strontium oxide, High Temp. Sci., 1976, 8, 73. [all data]

Drowart, Exsteen, et al., 1964
Drowart, J.; Exsteen, G.; Verhaegen, G., Mass spectrometric determination of the dissociation energy of the molecules MgO, CaO, SrO and Sr₂O, J. Chem. Soc. Faraday Trans., 1964, 60, 1920. [all data]

Mahanti, 1932
Mahanti, P.C., The band spectra of MgO, CaO and SrO, Phys. Rev., 1932, 42, 609. [all data]

Deezsi, Koczkas, et al., 1954
Deezsi, I.; Koczkas, E.; Matrai, T., Rotationsanalyse einiger blauen Banden des SrO-Molekuls, Acta Phys. Acad. Sci. Hung., 1954, 3, 95. [all data]

Charton and Gaydon, 1956
Charton, M.; Gaydon, A.G., Band spectra emitted by strontium and barium in arcs and flames, Proc. Phys. Soc. London Sect. A, 1956, 69, 520. [all data]

Pearse and Gaydon, 1976
Pearse, R.W.B.; Gaydon, A.G., The identification of molecular spectra, Pub. London - 4th Edition, Chapman and Hall, John Wiley & Sons, Inc., New York, 1976, 0. [all data]

Lagerqvist and Huldt, 1955
Lagerqvist, A.; Huldt, L., Die Trager der Flammenspektren der Erdalkalimetalle, Die Naturwissenschaften, 1955, 42, 365. [all data]

Huldt and Lagerqvist, 1956
Huldt, L.; Lagerqvist, A., Zum Ursprung der Bandenspektren von Calcium und Strontium, Ark. Fys., 1956, 11, 347. [all data]

Benard, Slafer, et al., 1977
Benard, D.J.; Slafer, W.D.; Hecht, J., Chain reaction chemiluminescence of alkaline earth catalyzed N₂O-CO flames, J. Chem. Phys., 1977, 66, 1012. [all data]

Eckstrom, Barker, et al., 1977
Eckstrom, D.J.; Barker, J.R.; Hawley, J.G.; Reilly, J.P., Intracavity dye laser spectroscopy studies of the Ba + N₂O, Ca + N₂O + CO, and Sr + N₂O + CO reactions, Appl. Opt., 1977, 16, 2102. [all data]

Almkvist and Lagerqvist, 1950
Almkvist, G.; Lagerqvist, A., Perturbations in the infra-red bands of SrO, Ark. Fys., 1950, 2, 233. [all data]

Brewer and Hauge, 1968
Brewer, L.; Hauge, R., Near infrared bands of diatomic CaO and SrO, J. Mol. Spectrosc., 1968, 25, 330. [all data]

Capelle, Broida, et al., 1975
Capelle, G.A.; Broida, H.P.; Field, R.W., Photon yields of several reactions producing diatomic strontium oxide and halides, and SrO (A'¹Π-X¹Σ): a new band system, J. Chem. Phys., 1975, 62, 3131. [all data]

Hecht, 1976
Hecht, J., Vibrational analysis of the A'¹Π state of strontium oxide using two isotopes, J. Chem. Phys., 1976, 65, 5026. [all data]

Ault and Andrews, 1975
Ault, B.S.; Andrews, L., Nitrogen matrix reactions of alkaline earth metal atoms with ozone: infrared spectra of the alkaline earth metal oxide molecules, J. Chem. Phys., 1975, 62, 2320. [all data]

Kaufman, Wharton, et al., 1965
Kaufman, M.; Wharton, L.; Klemperer, W., Electronic structure of SrO, J. Chem. Phys., 1965, 43, 943. [all data]

Liszt and Smith, 1971
Liszt, H.S.; Smith, Wm.H., RKR Franck-Condon factors for blue and ultraviolet transitions of some metal oxides, J. Quant. Spectrosc. Radiat. Transfer, 1971, 11, 1043. [all data]

Lagerqvist and Selin, 1956
Lagerqvist, A.; Selin, L.-E., Einige ultrarote Banden des SrO Molekules, Ark. Fys., 1956, 11, 323. [all data]

Field, 1974
Field, R.W., Assignment of the lowest ³Π and ¹Π states of CaO, SrO, and BaO, J. Chem. Phys., 1974, 60, 2400. [all data]

Nicholls, 1962
Nicholls, R.W., Franck-Condon factors to high vibrational quantum numbers II: SiO, MgO, SrO, AlO, VO, NO, J. Res. Nat. Bur. Stand. Sect. A, 1962, 66, 227. [all data]

Yoshimine, 1968
Yoshimine, Y., Computed ground state properties of BeO, MgO, CaO, and SrO in molecular orbital approximation, J. Phys. Soc. Jpn., 1968, 25, 1100. [all data]

Notes

Go To: Top, Gas phase ion energetics data, Constants of diatomic molecules, References

Symbols used in this document:

IE (evaluated) Recommended ionization energy
Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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