Lanthanum monosulfide
- Formula: LaS
- Molecular weight: 170.970
- CAS Registry Number: 12031-30-0
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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 February, 1975
| Symbol | Meaning |
|---|---|
| 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) |
| State | Te | ωe | ωexe | ωeye | Be | αe | γe | De | βe | re | Trans. | ν00 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Strong absorption in the region 22200 - 23800 cm-1. Complex Structure. | ||||||||||||
| ↳Marcano and Barrow, 1970 | ||||||||||||
| B 2Σ+ | 13790.17 | 410.075 H | 0.94 | [0.11099] 1 | (0.00034) | [0.031E-6] | [2.4174] | B ↔ X R | 13766.86 Z | |||
| ↳Marcano and Barrow, 1970 | ||||||||||||
| X 2Σ+ | 0 | 456.70 H | 0.965 | [0.11693] 2 | (0.00034) | [0.030E-6] | [2.3552] | |||||
Notes
| 1 | Large spin-splittings, γ0 = (-)0.09627. |
| 2 | Large hyperfine splittings, 4b = 0.47 cm-1. |
| 3 | Thermochemical value (mass-spectrometry) Cater, Lee, et al., 1965, Coppens, Smoes, et al., 1967, Cater and Steiger, 1968, Bergman, Coppens, et al., 1970. |
References
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.
Marcano and Barrow, 1970
Marcano, M.; Barrow, R.F.,
Analysis of the transition B2Σ+-X2Σ+ in gaseous LaS,
J. Phys. B:, 1970, 3, 121. [all data]
Cater, Lee, et al., 1965
Cater, E.D.; Lee, T.E.; Johnson, E.W.; Rauh, E.G.; Eick, H.A.,
Vaporization, thermodynamics, and dissociation energy of lanthanum monosulfide,
J. Phys. Chem., 1965, 69, 2684. [all data]
Coppens, Smoes, et al., 1967
Coppens, P.; Smoes, S.; Drowart, J.,
Mass spectrometric determination of the dissociation energies of the molecules GeS, ScS, YS, LaS, and CeS,
Trans. Faraday Soc., 1967, 63, 2140. [all data]
Cater and Steiger, 1968
Cater, E.D.; Steiger, R.P.,
Vaporization, thermodynamics, and dissociation energy of lanthanum monosulfide. II,
J. Phys. Chem., 1968, 72, 2231. [all data]
Bergman, Coppens, et al., 1970
Bergman, C.; Coppens, P.; Drowart, J.; Smoes, S.,
Mass spectrometric determination of the dissociation energies of the gaseous rare earth monoselenides and monotellurides,
Trans. Faraday Soc., 1970, 66, 800. [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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