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Iridium monoxide

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

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 193Ir16O
Additional bands at 14338, 14490 cm-1 Raziunas, Macur, et al., 1965 and 17070 cm-1 Raziunas, Macur, et al., 1965, Jansson and Scullman, 1972.
Raziunas, Macur, et al., 1965; Jansson and Scullman, 1972
H' (3/2)     [0.3378] 1   [4.0E-7] 1  [1.8381] H' rarrow A' R 22005.8 2 1 Z
Jansson and Scullman, 1972
H" 5/2  3   [0.3371] 3  [4.0E-7]  [1.8400] H" rarrow A" R 21869.7 2 Z
Jansson and Scullman, 1972
D (3/2) a' + 17720 [672.5] Z   0.3534 4 0.0026  [3.2E-7]  1.7971 D rarrow A' R 17602.72 2 Z
missing citation
A 5/2 6  903.3 Z 4.7  0.3867 5 0.0024  [2.9E-7]  1.7180  
A' (3/2) 6 7 909.4 Z 4.7  0.3847 0.0025  3.0E-7  1.7224  


1Only one perturbed vibrational level of H' analyzed; vibrational numbering uncertain.
2J' = 0 relative to J" = 0.
3Three additional levels, numbered I, II, and III by Jansson and Scullman, 1972, have been identified in transitions to A" and may represent v = 1, 2, and 3 of H". With this interpretation B1= 0.3307, B2= 0.326, B3= 0.3205, and DeltaG(1/2 ,..., 3/2) = 605.2 Z, 564.6, 544.3.
4Perturbation in v=0 at J = 59 1/2.
6A' and A" may be the two components of a 2Delta state.
7missing note
8Thermochemical value, estimated Drowart and Goldfinger, 1967 from mass-spectrometric results of Norman, Staley, et al., 1965.


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

Raziunas, Macur, et al., 1965
Raziunas, V.; Macur, G.; Katz, S., Emission spectrum and thermodynamic properties of ruthenium monoxide, J. Chem. Phys., 1965, 43, 1010. [all data]

Jansson and Scullman, 1972
Jansson, K.; Scullman, R., On the band spectrum of IrO in the region 4200-6400 Å, J. Mol. Spectrosc., 1972, 43, 208. [all data]

Drowart and Goldfinger, 1967
Drowart, J.; Goldfinger, P., Investigation of inorganic systems at high temperature by mass spectrometry, Angew. Chem. Int. Ed. Engl., 1967, 6, 581. [all data]

Norman, Staley, et al., 1965
Norman, J.H.; Staley, H.G.; Bell, W.E., Massspectrometric study of gaseous oxides of iridium, J. Chem. Phys., 1965, 42, 1123. [all data]


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