OIO

Formula: IO₂
Molecular weight: 158.9033
CAS Registry Number: 13494-92-3
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Data at other public NIST sites:
- Gas Phase Kinetics Database
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Vibrational and/or electronic energy levels

State: A

Energy (cm^-1)		Med.	Transition	λ_min (nm)	λ_max (nm)	References


T_o = 14553 ± 7	T	gas	A-X	480	662	Himmelmann, Orphal, et al., 1996
T_x = 18180		Ar	A-X	467	634	Maier and Bothur, 1997

Vib. sym.	No.	Approximate type of mode	cm^-1	Med.	Method	References


a₁	1	Sym. stretch	631 ± 3	gas	AB	Himmelmann, Orphal, et al., 1996
	2	Bend	177 ± 2	gas	AB	Himmelmann, Orphal, et al., 1996

State: X

Vib. sym.	No.	Approximate type of mode	cm^-1		Med.	Method	References


a₁	1	Sym. stretch	765 ± 25		gas	PE	Gilles, Polak, et al., 1992
	1	Sym. stretch	768.0	w m	Ar	IR	Maier and Bothur, 1997
	1	Sym. stretch	769.5		O₂	IR	Maier and Bothur, 1997
	2	Bend	192 ± 35		gas	PE	Gilles, Polak, et al., 1992
b₂	3	Asym. stretch	800.3	vs	Ar	IR	Maier and Bothur, 1997
	3	Asym. stretch	801.3		O₂	IR	Maier and Bothur, 1997

Additional references: Jacox, 1994, page 114; Jacox, 1998, page 207; Miller and Cohen, 2003

Notes

Weak

Medium

Very strong

Tentative assignment or approximate value

Energy separation between the v = 0 levels of the excited and electronic ground states.

Energy separation between the band maximum of the excited electronic state and the v = 0 level of the ground state.

References

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Himmelmann, Orphal, et al., 1996
Himmelmann, S.; Orphal, J.; Bovensmann, H.; Richter, A.; Ladstatter-Weissenmayer, A.; Burrows, J.P., First observation of the OIO molecule by time-resolved flash photolysis absorption spectroscopy, Chem. Phys. Lett., 1996, 251, 5-6, 330, https://doi.org/10.1016/0009-2614(96)00114-5 . [all data]

Maier and Bothur, 1997
Maier, G.; Bothur, A., Matrix-Isolation of Iodine Superoxide and Iodine Dioxide, Chem. Ber., 1997, 130, 2, 179, https://doi.org/10.1002/cber.19971300207 . [all data]

Gilles, Polak, et al., 1992
Gilles, M.K.; Polak, M.L.; Lineberger, W.C., Photoelectron Spectroscopy of the Halogen Oxide Anions FO-, ClO-, BrO-, IO-, OClO-, and OIO-, J. Chem. Phys., 1992, 96, 11, 8012, https://doi.org/10.1063/1.462352 . [all data]

Jacox, 1994
Jacox, M.E., Vibrational and electronic energy levels of polyatomic transient molecules, American Chemical Society, Washington, DC, 1994, 464. [all data]

Jacox, 1998
Jacox, M.E., Vibrational and electronic energy levels of polyatomic transient molecules: supplement A, J. Phys. Chem. Ref. Data, 1998, 27, 2, 115-393, https://doi.org/10.1063/1.556017 . [all data]

Miller and Cohen, 2003
Miller, C.E.; Cohen, E.A., The rotational spectrum of iodine dioxide, OIO, J. Chem. Phys., 2003, 118, 14, 6309, https://doi.org/10.1063/1.1540107 . [all data]

Notes

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Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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