germanium telluride

Formula: GeTe
Molecular weight: 200.24
CAS Registry Number: 12025-39-7
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Data at other public NIST sites:
- Microwave spectra (on physics lab web site)
- X-ray Photoelectron Spectroscopy Database, version 5.0
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Gas phase ion energetics data

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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

Ionization energy determinations

IE (eV)	Method	Reference	Comment
9.7	EI	Balducci, Sacconi, et al., 1991	LL
10.1 ± 0.5	EI	Colin and Drowart, 1964	RDSH
9.1	PE	White, Rosenberg, et al., 1979	Vertical value; LLK

Appearance energy determinations

Ion	AE (eV)	Other Products	Method	Reference	Comment
Ge⁺	12.2	Te	EI	Balducci, Sacconi, et al., 1991	LL
Ge⁺	12.6 ± 0.5	Te	EI	Colin and Drowart, 1964	RDSH
Te⁺	13.0	Ge	EI	Balducci, Sacconi, et al., 1991	LL
Te⁺	13.3 ± 0.5	Ge	EI	Colin and Drowart, 1964	RDSH

Constants of diatomic molecules

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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 ⁷⁴Ge¹³⁰Te
State	T_e	ω_e	ω_ex_e	B_e	α_e	γ_e	D_e	r_e	Trans.	ν₀₀
E	(31470)	(170) H	(1.2)						E ← X R	31458 $bH
	↳Drummond and Barrow, 1952
									E ← X R	31401 $bH
	↳Drummond and Barrow, 1952
A ¹Π	27750.8	221.0 H	0.89						A ↔ X R	27699.3 H
A ¹Π	↳missing citation; Drummond and Barrow, 1952
X ¹Σ⁺	0	323.9 H	0.75	0.06533821	0.00017246	-0.00000005	1.18E-₈	2.340165 1
	↳Marino, Guerin, et al., 1974
								2
	↳Hoeft and Nolting, 1967

Notes

IR sp. 5

Microwave sp. 6

Thermochemical value (mass-spectrom.) Colin and Drowart, 1964, corrected for the new value of D₀⁰(Te₂). Extrapolation of the vibrational levels of the E state Drummond and Barrow, 1952 gives 4.1 ± 0.4 eV.

There seem to be two components of this band system, possibly owing to strong perturbations.

In low-temperature nitrogen matrix.

μ_el(v=0)= 1.06 D Hoeft, Lovas, et al., 1970 from Stark effect of microwave spectrum Hoeft, Lovas, et al., 1970; hyperfine structure of ⁷³Ge Tiemann, Hoeft, et al., 1971. See also Hoeft, Lovas, et al., 1970, 2.

References

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Balducci, Sacconi, et al., 1991
Balducci, G.; Sacconi, L.V.; Gigli, G., The dimerization energies of the Ge₂S₂, Ge₂Se₂, and Ge₂Te₂ molecules, Ber. Bunsen-Ges. Phys. Chem., 1991, 95, 1651. [all data]

Colin and Drowart, 1964
Colin, R.; Drowart, J., Thermodynamic study of germanium monotelluride using a mass spectrometer, J. Phys. Chem., 1964, 68, 428. [all data]

White, Rosenberg, et al., 1979
White, M.G.; Rosenberg, R.A.; Lee, S.T.; Shirley, D.A., The He(I) photoelectron spectroscopy of heavy group IV-VI diatomics, J. Electron Spectrosc. Relat. Phenom., 1979, 17, 323. [all data]

Drummond and Barrow, 1952
Drummond, G.; Barrow, R.F., The ultra-violet absorption spectra of GeO, GeS, GeSe and GeTe, Proc. Phys. Soc. London Sect. A, 1952, 65, 277. [all data]

Marino, Guerin, et al., 1974
Marino, C.P.; Guerin, J.D.; Nixon, E.R., Infrared spectra of some matrix-isolated germanium, tin, and lead chalcogenides, J. Mol. Spectrosc., 1974, 51, 160. [all data]

Hoeft and Nolting, 1967
Hoeft, J.; Nolting, H.-P., Das Mikrowellenrotationsspektrum des GeTe, Z. Naturforsch. A, 1967, 22, 1121. [all data]

Hoeft, Lovas, et al., 1970
Hoeft, J.; Lovas, F.J.; Tiemann, E.; Torring, T., Elektrisches Dipolmoment von GeSe, GeTe, PbSe und PbTe, Z. Naturforsch. A, 1970, 25, 539. [all data]

Tiemann, Hoeft, et al., 1971
Tiemann, E.; Hoeft, J.; Torring, T., Hyperfeinstruktur des GeTe, Z. Naturforsch. A, 1971, 26, 1930. [all data]

Hoeft, Lovas, et al., 1970, 2
Hoeft, J.; Lovas, J.; Tiemann, E.; Torring, T., Dipole moments and hyperfine structure of the group IV/VI diatomic molecules, J. Chem. Phys., 1970, 53, 2736. [all data]

Notes

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Symbols used in this document:

AE Appearance energy
Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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