rhodium carbide

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 May, 1975

Symbols used in the table of constants
SymbolMeaning
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 103Rh12C
StateTeωeωexeωeyeBeαeγeDeβereTrans.ν00
Additional systems observed in matrix absorption. Brom, Graham, et al., 1972
D 2Σ(-) (21756) (782) 1   (0.482) 1 2     (1.804)  
↳Lagerqvist and Scullman, 1966
C 2Σ(+) 21439.2 927.8 3 Z 13.73  0.5510 3 4 0.0060  (1.0E-6)  1.6873 C ← X R 21376.0 3 Z
↳Lagerqvist, Neuhaus, et al., 1965; missing citation; Brom, Graham, et al., 1972
B 2Σ(+)     [0.5067] 5 6   (0.8E-6)  [1.7595] B ← X R 21361.0 5 Z
↳Lagerqvist, Neuhaus, et al., 1965; Lagerqvist and Scullman, 1966; Brom, Graham, et al., 1972
StateTeωeωexeωeyeBeαeγeDeβereTrans.ν00
A 2Πr 10242.75 7 939.12 Z 5.48 0.021 0.57149 0.00428  0.832E-6 3.2E-9 1.6554 A ↔ X R 10187.24 8 Z
↳Kaving and Scullman, 1969; Brom, Graham, et al., 1972
9462.94 949.41 Z 5.357  0.57329 9 0.00426  0.826E-6 -1.9E-9 1.6554 A ↔ X R 9412.60 8 Z
X 2Σ(+) 0 1049.87 Z 4.937  0.6027 10 0.00396  0.783E-6 1.2E-8 1.6133 11  

Notes

1Vibrational numbering uncertain. All information based on perturbations in C 2Σ(+).
2Spin-splitting constant γ ~ -1.6.
3Strong perturbations produced by interaction with B 2Σ+, and weaker perturbations produced by D 2Σ(-). The constants in the table are deperturbed values. The observed origin of the 0-0 band is at 21452.0 cm-1.
4Spin-splitting constant γ ~ -0.03.
5Vibrational numbering uncertain. Strong interaction with v=0 of C 2Σ(+). The constants in the table are deperturbed values. The observed band origin is at 21285.0 cm-1.
6Spin splitting constant γ = +1.00.
7Av= + 781.07 - 10.50(v+1/2); also J-dependent terms.
8J'=0 relative to N"=0.
9Λ-type doubling; Δvfe(2Π1/2) = (+)[0.0177 + 0.00l6(v+1/2)](J+1/2).
10Spin-splitting constant γ = -0.065.
11ESR sp. 13
12Thermochemical value (mass-spectrometry) Auwera-Mahieu and Drowart, 1967, Cocke and Gingerich, 1972.
13In rare gas matrices at 4 K Brom, Graham, et al., 1972.

References

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

Brom, Graham, et al., 1972
Brom, J.M., Jr.; Graham, W.R.M.; Weltner, W., Jr., ESR and optical spectroscopy of the RhC molecule at 4°K, J. Chem. Phys., 1972, 57, 4116. [all data]

Lagerqvist and Scullman, 1966
Lagerqvist, A.; Scullman, R., Rotational analysis of the spectrum of RhC in the 4000-5000 Å region, Ark. Fys., 1966, 32, 479. [all data]

Lagerqvist, Neuhaus, et al., 1965
Lagerqvist, A.; Neuhaus, H.; Scullman, R., Das Bandenspektrum des RhC, Z. Naturforsch. A, 1965, 20, 751. [all data]

Kaving and Scullman, 1969
Kaving, B.; Scullman, R., The spectrum of RhC in the near infrared region, J. Mol. Spectrosc., 1969, 32, 475. [all data]

Auwera-Mahieu and Drowart, 1967
Auwera-Mahieu, A.V.; Drowart, J., The dissociation energies of the molecules PtC and RhC, Chem. Phys. Lett., 1967, 1, 311-313. [all data]

Cocke and Gingerich, 1972
Cocke, D.L.; Gingerich, K.A., Determination of the heats of atomization of the molecules RhC2, RhC, and TiC2 by high temperature mass spectrometry, J. Chem. Phys., 1972, 57, 3654. [all data]

Notes

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