Germanium monofluoride

Formula: FGe
Molecular weight: 91.64
IUPAC Standard InChI: InChI=1S/FGe/c1-2
IUPAC Standard InChIKey: HHFCFXJTAZTLAO-UHFFFAOYSA-N
CAS Registry Number: 14929-46-5
Chemical structure:
This structure is also available as a 2d Mol file
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Constants of diatomic molecules

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

Data collected through September, 1976

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 ⁷⁴Ge¹⁹F
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
G ²Δ_r(4dδ)	49412.89 1	710.37 Z	2.82 H		0.38408	0.00261		[4.43E-7] 2		1.7041₁	G → X V	48523.4 H^Q
	↳Barrow, Butler, et al., 1959; missing citation
											G → X V	49415.6 H^Q
	↳Barrow, Butler, et al., 1959; missing citation
D ²Σ⁺(6sσ)	48581.26	833.12 Z 3	6.52 H		0.39972 3	0.00214		[3.7₃E-7] 4		1.6704	D → A V	25473.3₀ Z
	↳missing citation
											D → X V	47726.6 H^Q
	↳missing citation
											D → X V	48662.6 H^Q
	↳missing citation
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
D' ²p(4dπ)	47920.73 5	803.96 6 Z	3.38 H		0.40068 6 7	0.00259		3.6₂E-7 6		1.6684	D' → A V	24798.9₈ 6 Z
	↳missing citation
											D' → X 8 V	47043.0 H
	↳missing citation
											D' → X 8 V	47976.3 H
	↳missing citation
E ²Σ⁺ (5pσ)	46645.41	760.08 Z	2.967		0.39845 9	0.00290		4.33E-7		1.6731₀	E → B 10	11616.26 Z
E ²Σ⁺ (5pσ)	↳missing citation
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 ²Δ	43977.49 11	[684.00] Z	9.31		0.38835	0.00421		[4.97E-7] 12		1.6947₂	C → X V	43059.27 13 Z
	↳Barrow, Butler, et al., 1959; Uzikov and Kuzyakov, 1969; missing citation
											C → X V	43994.43 13 Z
	↳Barrow, Butler, et al., 1959; Uzikov and Kuzyakov, 1969; missing citation
C' ²Π (5pπ)	43369.61 14	796.88 Z	3.415		0.39957 15	0.00258		4.13E-7		1.6707₅	C' → A 16 R	20244.31
	↳Martin and Merer, 1974
											C' → X 17 V	42547.8 H
	↳Uzikov and Kuzyakov, 1969; missing citation
											C' → X 17 V	43379.9 H
	↳Uzikov and Kuzyakov, 1969; missing citation
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 ⁴Σ^-	35194.68 18	[628.31] Z	6.66 19		0.36676 18	0.00369		[4.94E-7] 20		1.7439	a → X	35181.77 Z
a ⁴Σ^-	↳missing citation
B ²Σ⁺(5sσ)	35010.85	796.99 Z	3.613 21	0.0124	0.39440 22	0.00255		3.88E-7		1.6816₇	B → A V	11885.56 Z
	↳Barrow, Butler, et al., 1959
											B → X 23 V	34141.23 Z
	↳missing citation; missing citation
											B → X 23 V	35076.39 Z
	↳missing citation; missing citation
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 ²Σ⁺	23316.65	413.03 Z	1.124 24		0.32039 25	0.00307 26		7.78E-7 27		1.8658₂	A → X 23 R	22255.67 Z
A ²Σ⁺		413.03 Z	1.124 24		0.32039 25	0.00307 26		7.78E-7 27		1.8658₂		23190.83 Z
X ²Π_3/2	934.33	667.33 Z	3.150 28		0.36660	0.00267₅ 29		4.50		1.7452
X ²Π_1/2	0	665.67 Z	3.150 28		0.36578 30	0.00267₅ 29		4.47		1.7452

Notes

A₀ = +22.20, A₁ = +21.5: small J dependence.

D₁ = 4.52E-7.

Rotational analysis of v=2, and tentative results for v=0.

D₂ = 3.3₃E-7.

A₂ = (+)4.23, A₃ = (+)4.35.

Extrapolation from the rotationally analyzed levels v'=2 and 3; β_e = +0.2₁E-7.

Large Λ-type doubling, also spin-rotation interaction; see Martin and Merer, 1974.

The 0-1 and 0-2 bands were previously considered by Barrow, Butler, et al., 1959 as 0-0 bands of their transitions F-X and E-X, respectively.

Spin-doubling constant γ(v=0) = -0.0358.

Δv=0 sequence of slightly V shaded bands, provisionally assigned in Barrow, Butler, et al., 1959 to a E(²Π)- B(²Σ) transition.

A₀ = 13.88, A₁ = 14.25.

D₁ = 5.15E-7

Referring in the upper state to the zero point of the Hill-Van Vleck expression.

A₀ = 105.63, A₁ = 105.88, A₂ = 105.96; small J dependence.

Λ-type doubling in ²Π_1/2, Δv_fe(v=0)=-0.0373(J+1/2).

Extremely weak system consisting of a long 0-v" progression; not analyzed.

The 3-1 and 1-0 bands of C' ²Π_1/2 - X ²Π_1/2 correspond to the 0-0 subbands of a system D-X proposed earlier by Barrow, Butler, et al., 1959. The 2-1 band of the 3/2- 3/2 system was assigned by Barrow, Butler, et al., 1959 as 0-0 band of C'-X²Π_1/2.

Spin-splitting constants for v=0: λ = +8.086, v=0 [4λ = T₀(⁴Σ_3/2) - T₀(⁴Σ_1/2), v=0]; γ₁ ~ γ₂ = 0.0119, v=0. See also 22.

Based on the interpretation of a perturbation in B ²Σ⁺, v=4.

D₁ = 4.90E-7.

missing note

Spin=doubling constant γ(v=0) = +0.00100. Extensive perturbations between B ²Σ⁺, v=0, and, a ⁴Σ^-, v=0.

Franck-Condon factors Singh, 1975.

missing note

Spin-doubling constant γ(v) = -[0.03662 + 0.000l4(v+1/2)].

missing note

D_v= -0.22E-7(v+1/2) +...

missing note

Λ-type doubling, Δv_fe = -[0.0218₄ + 0.00019₅ (v+1/2)](J+1/2).

Thermochemical value (mass-spectrom.) Ehlert and Margrave, 1964; see also Harland, Cradock, et al., 1973.

Approximate limit of the ns (n = 5, 6, ...) Rydberg series Martin and Merer, 1974. Harland, Cradock, et al., 1973 give 7.2 eV from electron impact mass spectrometry.

References

Go To: Top, Constants of diatomic molecules, Notes

Barrow, Butler, et al., 1959
Barrow, R.F.; Butler, D.; Johns, J.W.C.; Powell, J.L., Some observations on the spectra of the diatomic fluorides of silicon, germanium, tin, and lead, Proc. Phys. Soc. London, 1959, 73, 317. [all data]

Uzikov and Kuzyakov, 1969
Uzikov, A.N.; Kuzyakov, Yu.Ya., Analysis of the vibrational structure of C-X²P and C'X²P-band systems and the energy of dissociation of GeF, Moscow Univ. Chem. Bull. Engl. Transl., 1969, 24, 22, In original 30. [all data]

Martin and Merer, 1974
Martin, R.W.; Merer, A.J., Rotational structure in some higher excited states of the GeF molecule, Can. J. Phys., 1974, 52, 1458. [all data]

Singh, 1975
Singh, J., Vibrational transition probabilities & r-centroids for diatomic fluorides of Si & Ge, Indian J. Pure Appl. Phys., 1975, 13, 204. [all data]

Ehlert and Margrave, 1964
Ehlert, T.C.; Margrave, J.L., Mass-spectrometric studies at high temperatures. II. The dissociation energies of the monofluorides and difluorides of silicon and germanium, J. Chem. Phys., 1964, 41, 1066. [all data]

Harland, Cradock, et al., 1973
Harland, P.W.; Cradock, S.; Thynne, J.C.J., Bond dissociation energies, ionisation potentials and electron affinities of some germanium fluoride species, Inorg. Nucl. Chem. Lett., 1973, 9, 53. [all data]

Notes

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Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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