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Helium, compound with neon (1:1)

Constants of diatomic molecules

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

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

Data collected through September, 1976

Symbols used in the table of constants
State electronic state and / or symmetry symbol
Te minimum electronic energy (cm-1)
ωe vibrational constant – first term (cm-1)
ωexe vibrational constant – second term (cm-1)
ωeye vibrational constant – third term (cm-1)
Be rotational constant in equilibrium position (cm-1)
αe rotational constant – first term (cm-1)
γe rotation-vibration interaction constant (cm-1)
De centrifugal distortion constant (cm-1)
βe rotational constant – first term, centrifugal force (cm-1)
re internuclear distance (Å)
Trans. observed transition(s) corresponding to electronic state
ν00 position of 0-0 band (units noted in table)
Diatomic constants for 4He(20)Ne
Similar but unclassified bands near other strong Ne lines.
Tanaka and Yoshino, 1972
F  [120] 1 2         F larrow X 3 162050
Tanaka and Yoshino, 1972
E  [40] 1 4         E larrow X 3 161340
Tanaka and Yoshino, 1972
D  [30] 1 5         D larrow X 3 159590
Tanaka and Yoshino, 1972
C  [100] 1 6         C larrow X 7 V 159050 H
Tanaka and Yoshino, 1972
B  [40] 1 8         B larrow X 3 158860
Tanaka and Yoshino, 1972
A  [150] 1 9         A larrow X 7 V 158440 H
Tanaka and Yoshino, 1972
X 1Sigma+ 0 10         3.21 11 12 


1First observed DeltaG, not necessarily DeltaG(1/2).
2Progression of five bands converging to 3d'[3/2]1u of Ne.
3Very diffuse features.
4Progression of six bands converging to 3d[1/2]1u of Ne.
5Progression of four bands converging over a maximum to 4s'[1/2]1u of Ne.
6Progression of six bands converging to 4s'[1/2]1u of Ne.
7Diffuse band heads.
8Progression of four bands converging over a maximum to 4s[3/2]1u of Ne.
9Progression of three bands converging to 4s[3/2]1u of Ne.
10Only v=0 is bound; see Bobetic and Barker, 1976.
11From molecular beam scattering measurements Chen, Siska, et al., 1973.
12Theoretical dipole moment function Matcha and Nesbet, 1967.


Go To: Top, Constants of diatomic molecules, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Tanaka and Yoshino, 1972
Tanaka, Y.; Yoshino, K., Absorption spectra of Ne2 and HeNe molecules in the vacuum-UV region, J. Chem. Phys., 1972, 57, 2964. [all data]

Bobetic and Barker, 1976
Bobetic, M.V.; Barker, J.A., Vibrational levels of heteronuclear rare gas van der Waals molecules, J. Chem. Phys., 1976, 64, 2367-2369. [all data]

Chen, Siska, et al., 1973
Chen, C.H.; Siska, P.E.; Lee, Y.T., Intermolecular potentials from crossed beam differential elastic scattering measurements. VIII. He+Ne, He+Ar, He+Kr, and He+Xe, J. Chem. Phys., 1973, 59, 2, 601-610. [all data]

Matcha and Nesbet, 1967
Matcha, R.L.; Nesbet, R.K., Electric dipole moments of rare-gas diatomic molecules, Phys. Rev., 1967, 160, 1, 72-75. [all data]


Go To: Top, Constants of diatomic molecules, References