rubidium fluoride

Formula: FRb
Molecular weight: 104.4662
IUPAC Standard InChI: InChI=1S/FH.Rb/h1H;/q;+1/p-1
IUPAC Standard InChIKey: AHLATJUETSFVIM-UHFFFAOYSA-M
CAS Registry Number: 13446-74-7
Chemical structure:
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Constants of diatomic molecules

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

Data collected through July, 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 ⁸⁵Rb¹⁹F
State	T_e	ω_e	ω_ex_e	B_e	α_e	γ_e	D_e	β_e	r_e	Trans.
Continuous absorption with maximum at 46500 cm^-1. 1
↳Caunt and Barrow, 1949; Barrow and Caunt, 1953
A 2										A ← X
A 2	↳Caunt and Barrow, 1949; Barrow and Caunt, 1953
X ¹Σ⁺	0	376 3	(1.9)	0.2106640₁	0.0015227₉ 4	3.30E-6	2.6839E-₇ 5	-3.₇E-10	2.270333 6
	↳Baikov and Vasilevskii, 1967
	SCF-LCAO-MO calculations Matcha, 1970
	Rotation sp.
	↳Lew, Morris, et al., 1958; Veazey and Gordy, 1965
	Mol. beam rf electric 7 8
	↳Hughes and Grabner, 1950; Zorn, English, et al., 1966; Bonczyk and Hughes, 1967
	and magn. reson. 9 8
	↳Bolef and Zeiger, 1952; Mehran, Brooks, et al., 1966

Notes

The electron energy loss spectrum has peaks at 4.9, 8.2, 9.4, 14.8, 18.4, 19.7, 21.0 eV Geiger and Pfeiffer, 1968.

Diffuse absorption bands 33500 - 42300 cm^-1.

From the IR spectrum Baikov and Vasilevskii, 1967; good agreement with ω_e = 373.27 Veazey and Gordy, 1965 and ω_ex_e = 1.80 Veazey and Gordy, 1965 as calculated from the rotational constants Veazey and Gordy, 1965.

Lew, Morris, et al., 1958 and Veazey and Gordy, 1965 give constants for ⁸⁷RbF.

Veazey and Gordy, 1965.

Rot.-vibr. b.

μ_el[D] = 8.5131 + 0.0665₀(v+1/2) + 0.0002₆(v+1/2)², v = 0,1,2 Graff, Schonwasser, et al., 1967, Hebert, Lovas, et al., 1968; eqQ(⁸⁵Rb)[MHz) = -70.739 + 0.797₅(v+1/2) - 0.005₃(v+1/2)², v=0...4 Zorn, English, et al., 1966, Bonczyk and Hughes, 1967, Graff, Schonwasser, et al., 1967.

Heitbaum and Schonwasser, 1972 give constants for ⁸⁷RbF (eqQ, μ_el, g_J, etc.).

g_J = (-)0.044₁ μ_N Mehran, Brooks, et al., 1966; somewhat different values by Graff, Schonwasser, et al., 1967 for v=0 (-0.05470) and v=1 (-0.05455).

Thermochemical value Brewer and Brackett, 1961; flame photometry gives 5.2 eV Bulewicz, Phillips, et al., 1961.

References

Go To: Top, Constants of diatomic molecules, Notes

Caunt and Barrow, 1949
Caunt, A.D.; Barrow, R.F., Ultra-violet absorption spectra of rubidium and caesium fluorides and the heat of dissociation of fluorine, Nature (London), 1949, 164, 753. [all data]

Barrow and Caunt, 1953
Barrow, R.F.; Caunt, A.D., The ultra-violet absorption spectra of some gaseous alkali-metal halides and the dissociation energy of fluorine, Proc. R. Soc. London A, 1953, 219, 120. [all data]

Baikov and Vasilevskii, 1967
Baikov, V.I.; Vasilevskii, K.P., Infrared spectra of sodium, potassium, rubidium, and cesium fluoride vapors, Opt. Spectrosc. Engl. Transl., 1967, 22, 198, In original 364. [all data]

Matcha, 1970
Matcha, R.L., Theoretical analysis of the electronic structure and molecular properties of the alkali halides. VI. Rubidium fluoride and sodium bromide, J. Chem. Phys., 1970, 53, 4490-4496. [all data]

Lew, Morris, et al., 1958
Lew, H.; Morris, D.; Geiger, F.E., Jr.; Eisinger, J.T., Rotational spectra of RbF by the electric resonance method, Can. J. Phys., 1958, 36, 171. [all data]

Veazey and Gordy, 1965
Veazey, S.E.; Gordy, W., Millimeter-wave molecular-beam spectroscopy: alkali fluorides, Phys. Rev. A: Gen. Phys., 1965, 138, 1303. [all data]

Hughes and Grabner, 1950
Hughes, V.; Grabner, L., The radiofrequency spectrum of Rb⁸⁵F and Rb⁸⁷F by the electric resonance method, Phys. Rev., 1950, 79, 314. [all data]

Zorn, English, et al., 1966
Zorn, J.C.; English, T.C.; Dickinson, J.T.; Stephenson, D.A., Molecular beam measurement of the hyperfine structure of ⁸⁵Rb¹⁹F, J. Chem. Phys., 1966, 45, 3731. [all data]

Bonczyk and Hughes, 1967
Bonczyk, P.A.; Hughes, V.W., Hyperfine structure of the v=O, J=l state in Rb⁸⁵F, Rb⁸⁷F, K³⁹F, and K⁴¹F by the molecular-beam electric-resonance method, Phys. Rev., 1967, 161, 15. [all data]

Bolef and Zeiger, 1952
Bolef, D.I.; Zeiger, H.J., Molecular beam magnetic resonance spectra of Rb⁸⁷F and Rb⁸⁷Cl at zero field, Phys. Rev., 1952, 85, 799. [all data]

Mehran, Brooks, et al., 1966
Mehran, F.; Brooks, R.A.; Ramsey, N.F., Rotational magnetic moments of alkali-halide molecules, Phys. Rev., 1966, 141, 93. [all data]

Geiger and Pfeiffer, 1968
Geiger, J.; Pfeiffer, H.-C., Untersuchung der Anregung innerer Elektronen von Alkalihalogenidmolekulen im Energieverlustspektrum von 25 keV-Elektronen, Z. Phys., 1968, 208, 105. [all data]

Graff, Schonwasser, et al., 1967
Graff, G.; Schonwasser, R.; Tonutti, M., Gleichzeitige Messung von Hyperfeinstruktur, Starkeffekt und Zeemaneffekt des ⁸⁵Rb¹⁹F mit einer Molekulstrahl-Resonanzapparatur, Z. Phys., 1967, 199, 157. [all data]

Hebert, Lovas, et al., 1968
Hebert, A.J.; Lovas, F.J.; Melendres, C.A.; Hollowell, C.D.; Story, T.L., Jr.; Street, K., Jr., Dipole moments of some alkali halide molecules by the molecular beam electric resonance method, J. Chem. Phys., 1968, 48, 2824. [all data]

Heitbaum and Schonwasser, 1972
Heitbaum, J.; Schonwasser, R., Gleichzeitige Messung von Hyperfeinstruktur, Stark-Effekt und Zeeman-Effekt des ⁸⁷RbF mit einer Molekulstrahl-Resonanzapparatur, Z. Naturforsch. A, 1972, 27, 92. [all data]

Brewer and Brackett, 1961
Brewer, L.; Brackett, E., The dissociation energies of gaseous alkali halides, Chem. Rev., 1961, 61, 425. [all data]

Bulewicz, Phillips, et al., 1961
Bulewicz, E.M.; Phillips, L.F.; Sugden, T.M., Determination of dissociation constants and heats of formation of simple molecules by flame photometry. Part 8. Stabilities of the gaseous diatomic halides of certain metals, Trans. Faraday Soc., 1961, 57, 921. [all data]

Notes

Go To: Top, Constants of diatomic molecules, References

Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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