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Iodine oxide

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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 January, 1977

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 127I16O
A 2Pi3/2 21557.81 514.57 1 5.52  0.27635 2 0.00273  3.2E-7  2.0723 A lrarrow X1 3 R 21474.05 Z
missing citation; missing citation; missing citation
X2 2Pi1/2 (2330) 4           
X1 2Pi3/2 0 681.47 Z 4.29 5  0.34026 6 0.002696 7  3.6E-7  1.8676 8  
Saito, 1973
EPR sp.
Carrington, Dyer, et al., 1970; Brown, Byfleet, et al., 1972


1missing note
2The rotational lines of absorption bands with v'=0 and 2 are sharp; the lines of the 3-0 absorption band are distinctly diffuse, and the 1-0 and 4-0 bands are completely diffuse owing to predissociation Durie and Ramsay, 1958.
3Franck-Condon factors Rao, Rao, et al., 1974.
4Estimated by Brown, Byfleet, et al., 1972, from spin-orbit coupling of component atoms.
5missing note
6From the microwave spectrum Saito, 1973 obtained B0(2Pi3/2) = 0.338804 which agrees well with the value from the electronic spectrum.
7missing note
8Microwave sp. 10
9Based on an extrapolation of the vibrational levels of A 2Pi3/2 and on the assumption that A dissociates into 2P3/2 + 1D. Flame photometry Phillips and Sugden, 1961 gives a value of 2.4 eV which seems less likely since it is as high as the value for BrO. The observed predissociation in A indicates D00 leq 2.72 eV. Extrapolation of the ground state gives D00= 1.94 eV Trivedi and Gohel, 1972.
10Magnetic hyperfine interaction, nuclear quadrupole coupling and constant.


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.

Saito, 1973
Saito, S., Microwave spectrum of the IO radical, J. Mol. Spectrosc., 1973, 48, 530. [all data]

Carrington, Dyer, et al., 1970
Carrington, A.; Dyer, P.N.; Levy, D.H., Gas-phase electron resonance spectra of BrO and IO, J. Chem. Phys., 1970, 52, 309. [all data]

Brown, Byfleet, et al., 1972
Brown, J.M.; Byfleet, C.R.; Howard, B.J.; Russell, D.K., The electron resonance spectra of BrO, IO and SeF in J=5/2 rotational levels, Mol. Phys., 1972, 23, 457. [all data]

Durie and Ramsay, 1958
Durie, R.A.; Ramsay, D.A., Absorption spectra of the halogen monoxides, Can. J. Phys., 1958, 36, 35. [all data]

Rao, Rao, et al., 1974
Rao, M.L.P.; Rao, D.V.K.; Rao, P.T., Dissociation energies, r-centroids and Franck-Condon factors of IO molecule, Phys. Lett. A, 1974, 50, 341. [all data]

Phillips and Sugden, 1961
Phillips, L.F.; Sugden, T.M., Determination of dissociation constants and heats of formation of molecules by flame photometry. Part 7. Flame photometric study of the IO radical, Trans. Faraday Soc., 1961, 57, 914. [all data]

Trivedi and Gohel, 1972
Trivedi, V.M.; Gohel, V.B., Dissociation energy of the IO molecule, J. Phys. B:, 1972, 5, 38. [all data]


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