Home Symbol which looks like a small house Up Solid circle with an upward pointer in it

Hydroxyl radical

Data at NIST subscription sites:

NIST subscription sites provide data under the NIST Standard Reference Data Program, but require an annual fee to access. The purpose of the fee is to recover costs associated with the development of data collections included in such sites. Your institution may already be a subscriber. Follow the links above to find out more about the data in these sites and their terms of usage.

Gas phase ion energetics data

Go To: Top, References, Notes

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

Data evaluated as indicated in comments:
HL - Edward P. Hunter and Sharon G. Lias
L - Sharon G. Lias

Data compiled as indicated in comments:
B - John E. Bartmess
LL - Sharon G. Lias and Joel F. Liebman
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron

View reactions leading to HO+ (ion structure unspecified)

Quantity Value Units Method Reference Comment
IE (evaluated)13.017 ± 0.002eVN/AN/AL
Quantity Value Units Method Reference Comment
Proton affinity (review)141.8kcal/molN/AHunter and Lias, 1998HL
Quantity Value Units Method Reference Comment
Gas basicity134.8kcal/molN/AHunter and Lias, 1998HL

Electron affinity determinations

EA (eV) Method Reference Comment
1.82767LPDSmith, Kim, et al., 1997Given: 14741.02(3) cm-1. dHacid(0K) = 389.11±0.014; B
1.827669 ± 0.000044LPDSchulz, Mead, et al., 1982Given: 1.82767±0.00021 eV; B
1.829 ± 0.010LPESCelotta, Bennett, et al., 1974B
1.8250 ± 0.0020LPDHotop, Patterson, et al., 1974B
1.830 ± 0.040PDBranscomb, 1966B
1.80 ± 0.20EIAETsuda and Hamill, 1964From MeOH,EtOH,nPrOH; B
1.80321N/ACheck, Faust, et al., 2001MnBr3-; ; «DELTA»S(EA)=1.7; B
1.89 ± 0.12SIPage and Goode, 1969The Magnetron method, lacking mass analysis, is not considered reliable.; B

Ionization energy determinations

IE (eV) Method Reference Comment
13.0170 ± 0.0002TEWiedmann, Tonkyn, et al., 1992LL
13.01PEVan Lonkhuyzen and De Lange, 1984LBLHLM
12.88DERBerkowitz, Appelman, et al., 1973LLK
13.5 ± 1.0EIUy, Srivastava, et al., 1971LLK
12.94DERDibeler, Walker, et al., 1966RDSH
13.2 ± 0.1EIFoner and Hudson, 1956RDSH
13.01PEKatsumata and Lloyd, 1977Vertical value; LLK

De-protonation reactions

O- + Hydrogen cation = Hydroxyl radical

By formula: O- + H+ = HO

Quantity Value Units Method Reference Comment
Deltar382.600 ± 0.010kcal/molD-EANeumark, Lykke, et al., 1985gas phase; Given: 1.461122(3) eV; revised to 1.4611107(17) eV, 95BLO, based on missing term+86CODATA; B
Quantity Value Units Method Reference Comment
Deltar376.73 ± 0.15kcal/molH-TSNeumark, Lykke, et al., 1985gas phase; Given: 1.461122(3) eV; revised to 1.4611107(17) eV, 95BLO, based on missing term+86CODATA; B


Go To: Top, Gas phase ion energetics data, Notes

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

Hunter and Lias, 1998
Hunter, E.P.; Lias, S.G., Evaluated Gas Phase Basicities and Proton Affinities of Molecules: An Update, J. Phys. Chem. Ref. Data, 1998, 27, 3, 413-656, https://doi.org/10.1063/1.556018 . [all data]

Smith, Kim, et al., 1997
Smith, J.R.; Kim, J.B.; Lineberger, W.C., High-resolution Threshold Photodetachment Spectroscopy of OH-, Phys. Rev. A, 1997, 55, 3, 2036, https://doi.org/10.1103/PhysRevA.55.2036 . [all data]

Schulz, Mead, et al., 1982
Schulz, P.A.; Mead, R.D.; Jones, P.L.; Lineberger, W.C., OH- and OD- threshold photodetachment, J. Chem. Phys., 1982, 77, 1153. [all data]

Celotta, Bennett, et al., 1974
Celotta, R.S.; Bennett, R.A.; Hall, J.L., Laser Photodetachment Determination of the Electron Affinities of OH, NH2, NH, SO2, and S2, J. Chem. Phys., 1974, 60, 5, 1740, https://doi.org/10.1063/1.1681268 . [all data]

Hotop, Patterson, et al., 1974
Hotop, H.; Patterson, T.A.; Lineberger, W.C., High resolution photodetachment study of OH- and OD- in the threshold region 7000-6450 Å, J. Chem. Phys., 1974, 60, 1806. [all data]

Branscomb, 1966
Branscomb, L.M., Photodetachment Cross Section, Electron Affinity, and Structure of the Negative Hydroxyl Ion, Phys. Rev., 1966, 148, 1, 11, https://doi.org/10.1103/PhysRev.148.11 . [all data]

Tsuda and Hamill, 1964
Tsuda, S.; Hamill, W.H., Ionization Efficiency Measurements by the Retarding Potential Difference Method, Adv. Mass Spectrom., 1964, 3, 249. [all data]

Check, Faust, et al., 2001
Check, C.E.; Faust, T.O.; Bailey, J.M.; Wright, B.J.; Gilbert, T.M.; Sunderlin, L.S., Addition of Polarization and Diffuse Functions to the LANL2DZ Basis Set for P-Block Elements, J. Phys. Chem. A,, 2001, 105, 34, 8111, https://doi.org/10.1021/jp011945l . [all data]

Page and Goode, 1969
Page, F.M.; Goode, G.C., Negative Ions and the Magnetron., Wiley, NY, 1969. [all data]

Wiedmann, Tonkyn, et al., 1992
Wiedmann, R.T.; Tonkyn, R.G.; White, M.G.; Wang, K.; McKoy, V., Rotationally resolved threshold photoelectron spectra of OH and OD, J. Chem. Phys., 1992, 97, 768. [all data]

Van Lonkhuyzen and De Lange, 1984
Van Lonkhuyzen, H.; De Lange, C.A., U. V. photoelectron spectroscopy of OH and OD radicals, Mol. Phys., 1984, 51, 551. [all data]

Berkowitz, Appelman, et al., 1973
Berkowitz, J.; Appelman, E.H.; Chupka, W.A., Photoionization of HOF with mass analysis, J. Chem. Phys., 1973, 58, 1950. [all data]

Uy, Srivastava, et al., 1971
Uy, O.M.; Srivastava, R.D.; Farber, M., Mass spectrometric determination of the heats of formation of gaseous BO2 BOF2, High Temp. Sci., 1971, 3, 462. [all data]

Dibeler, Walker, et al., 1966
Dibeler, V.H.; Walker, J.A.; Rosenstock, H.M., Mass spectrometric study of photoionization. V.Water and ammonia, J.Res. NBS, 1966, 70A, 459. [all data]

Foner and Hudson, 1956
Foner, S.N.; Hudson, R.L., Ionization potential of the OH free radical by mass spectrometry, J. Chem. Phys., 1956, 25, 602. [all data]

Katsumata and Lloyd, 1977
Katsumata, S.; Lloyd, D.R., The photoelectron spectra of the OH and OD radicals, Chem. Phys. Lett., 1977, 45, 519. [all data]

Neumark, Lykke, et al., 1985
Neumark, D.M.; Lykke, K.R.; Andersen, T.; Lineberger, W.C., Laser photodetachment measurement of the electron affinity of atomic oxygen, Phys. Rev. A:, 1985, 32, 1890. [all data]


Go To: Top, Gas phase ion energetics data, References