Hydroxyl radical

• Formula: HO
• Molecular weight: 17.0073
• IUPAC Standard InChI: InChI=1S/HO/h1H Copy

  
• IUPAC Standard InChIKey: TUJKJAMUKRIRHC-UHFFFAOYSA-N Copy
• CAS Registry Number: 3352-57-6
• Chemical structure:
  This structure is also available as a 2d Mol file or as a computed 3d SD file
  The 3d structure may be viewed using Java or Javascript.
• Isotopologues:
  • Hydroxyl-d
  • hydroxyl-t
• Permanent link for this species. Use this link for bookmarking this species for future reference.
• Information on this page:
  • Gas phase thermochemistry data
  • Reaction thermochemistry data
  • Gas phase ion energetics data
  • Ion clustering data
  • Constants of diatomic molecules
  • References
  • Notes
• Other data available:
  • Henry's Law data
• Data at other public NIST sites:
  • Microwave spectra (on physics lab web site)
  • Gas Phase Kinetics Database
• Options:
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Data at NIST subscription sites:

• NIST / TRC Web Thermo Tables, professional edition (thermophysical and thermochemical data)

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Gas phase thermochemistry data

Go To: Top, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, Constants of diatomic molecules, References, Notes

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

Gas Phase Heat Capacity (Shomate Equation)

C_p° = A + B*t + C*t² + D*t³ + E/t²
H° − H°_298.15= A*t + B*t²/2 + C*t³/3 + D*t⁴/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t²/2 + D*t³/3 − E/(2*t²) + G
    C_p = heat capacity (cal/mol*K)
    H° = standard enthalpy (kcal/mol)
    S° = standard entropy (cal/mol*K)
    t = temperature (K) / 1000.

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View table.

Reaction thermochemistry data

Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, Ion clustering data, Constants of diatomic molecules, References, Notes

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

Data compiled by: John E. Bartmess

Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. A general reaction search form is also available. Future versions of this site may rely on reaction search pages in place of the enumerated reaction displays seen below.

Individual Reactions

O^- +  =

By formula: O^- + H⁺ = HO

 +  = HFO^-

By formula: F^- + HO = HFO^-

 +  = ( • )

By formula: H^- + HO = (H^- • HO)

Gas phase ion energetics data

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Ion clustering data, Constants of diatomic molecules, 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)

Electron affinity determinations

Ionization energy determinations

De-protonation reactions

O^- +  =

By formula: O^- + H⁺ = HO

Ion clustering data

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, Constants of diatomic molecules, References, Notes

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

Data compiled by: John E. Bartmess

Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. Searches may be limited to ion clustering reactions. A general reaction search form is also available.

Clustering reactions

 +  = HFO^-

By formula: F^- + HO = HFO^-

 +  = ( • )

By formula: H^- + HO = (H^- • HO)

Constants of diatomic molecules

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, References, Notes

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, 1977

Notes

References

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, 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.

Chase, 1998
Chase, M.W., Jr., NIST-JANAF Themochemical Tables, Fourth Edition, J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [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]

Deyerl and Continetti, 2005
Deyerl, H.J.; Continetti, R.E., Photoelectron-photofragment coincidence study of OHF-: transition state dynamics of the reaction OH+F - O+HF, Phys. Chem. Chem. Phys., 2005, 7, 5, 855-860, https://doi.org/10.1039/b414604b . [all data]

de Koening and Nibbering, 1984
de Koening, L.J.; Nibbering, N.M.M., Formation of the Long-Lived H₂O^-. Ion in the Gas Phase, J. Am. Chem. Soc., 1984, 106, 25, 7971, https://doi.org/10.1021/ja00337a054 . [all data]

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]

Easson and Pryce, 1973
Easson, I.; Pryce, M.H.L., Calculated potential energy curves of OH, Can. J. Phys., 1973, 51, 518. [all data]

Stevens, Das, et al., 1974
Stevens, W.J.; Das, G.; Wahl, A.C.; Krauss, M.; Neumann, D., Study of the ground state potential curve and dipole moment of OH by the method of optimized valence configurations, J. Chem. Phys., 1974, 61, 3686. [all data]

Chu, Yoshimine, et al., 1974
Chu, S.-I.; Yoshimine, M.; Liu, B., Ab initio study of the X²Π and A²Σ⁺ states of OH. I. Potential curves and properties, J. Chem. Phys., 1974, 61, 5389. [all data]

Meyer and Rosmus, 1975
Meyer, W.; Rosmus, P., PNO-Cl and CEPA studies of electron correlation effects. III. Spectroscopic constants and dipole moment functions for the ground states of the first-row and second-row diatomic hydrides, J. Chem. Phys., 1975, 63, 2356. [all data]

Michel, 1957
Michel, A., Das C²Σ⁺ → A²Σ⁺-Bandensystem von OH, Z. Naturforsch. A, 1957, 12, 887. [all data]

Felenbok, 1963
Felenbok, P., Contribution a l'etude du spectre moleculaire des radicaux OH et OD, Ann. Astrophys., 1963, 26, 393. [all data]

Douglas, 1974
Douglas, A.E., Absorption of OH in the 1200 Å region, Can. J. Phys., 1974, 52, 318. [all data]

Barrow, 1956
Barrow, R.F., The B²Σ⁺-A²Σ⁺ band-systems of OH and OD, Ark. Fys., 1956, 11, 281. [all data]

Herman, Felenbok, et al., 1961
Herman, L.; Felenbok, P.; Herman, R., Spectre d'emission des radicaux OH et OD, J. Phys. Radium, 1961, 22, 83. [all data]

Czarny, Felenbok, et al., 1971
Czarny, J.; Felenbok, P.; Lefebvre-Brion, H., High vibrational level predissociation in the A²Σ⁺ state of OD, J. Phys. B:, 1971, 4, 124. [all data]

Dieke and Crosswhite, 1948
Dieke; Crosswhite, Bumblebee Series, Johns Hopkins University (reference not verified), Rpt. No. 87, 1948, 1. [all data]

Stoebner and Delbourgo, 1967
Stoebner, A.; Delbourgo, R., Contribution a l'etude spectrographique de la sequence 0=2 de la transition A²Σ⁺ - X²Π du radical OH, J. Chim. Phys. Phys.-Chim. Biol., 1967, 64, 1115. [all data]

Evenson, Wells, et al., 1970
Evenson, K.M.; Wells, J.S.; Radford, H.E., Infrared resonance of OH with the H₂O laser: a galactic maser pump?, Phys. Rev. Lett., 1970, 25, 199. [all data]

Mizushima, 1972
Mizushima, M., Molecular parameters of OH free radical, Phys. Rev. A: Gen. Phys., 1972, 5, 143. [all data]

Allen, Blaine, et al., 1957
Allen, H.C., Jr.; Blaine, L.R.; Plyler, E.K., The emission spectrum of OH from 2-8 to 4-1 μ, Spectrochim. Acta, 1957, 9, 126. [all data]

Charters and Polanyi, 1960
Charters, P.E.; Polanyi, J.C., An improved technique for the observation of infrared chemiluminescence: resolved infrared emission of OH arising from the system H + O₂, Can. J. Chem., 1960, 38, 1742. [all data]

Maillard, Chauville, et al., 1976
Maillard, J.P.; Chauville, J.; Mantz, A.W., High-resolution emission spectrum of OH in an oxyacetylene flame from 3.7 to 0.9 μm, J. Mol. Spectrosc., 1976, 63, 120. [all data]

Benedict, Plyler, et al., 1953
Benedict, W.S.; Plyler, E.K.; Humphreys, C.J., The emission spectrum of OH from 1.4 to 1.7 μ, J. Chem. Phys., 1953, 21, 398. [all data]

Rogge, Yarger, et al., 1960
Rogge, W.H.; Yarger, F.L.; Dickey, F.P., Emission spectrum of the OH radical in an oxyacetylene flame in the 1.5-μ region, J. Chem. Phys., 1960, 33, 453. [all data]

Bass and Garvin, 1962
Bass, A.M.; Garvin, D., Analysis of the hydroxyl radical vibration rotation spectrum between 3900 Å and 11500 Å, J. Mol. Spectrosc., 1962, 9, 114. [all data]

Herman and Hornbeck, 1953
Herman, R.C.; Hornbeck, G.A., Vibration-rotation bands of OH, Astrophys. J., 1953, 118, 214. [all data]

Chamberlain and Roesler, 1955
Chamberlain, J.W.; Roesler, F.L., The OH bands in the infrared airglow, Astrophys. J., 1955, 121, 541. [all data]

McKinley, Garvin, et al., 1955
McKinley, J.D., Jr.; Garvin, D.; Boudart, M.J., Production of excited hydroxyl radicals in the hydrogen atom-ozone reaction, J. Chem. Phys., 1955, 23, 784. [all data]

Blackwell, Ingham, et al., 1960
Blackwell, D.E.; Ingham, M.F.; Rundle, H.N., The night-sky spectrum λλ 5000-6500 A, Astrophys. J., 1960, 131, 15. [all data]

Madden and Benedict, 1955
Madden, R.P.; Benedict, W.S., Pure rotation lines of OH, J. Chem. Phys., 1955, 23, 408. [all data]

Ducas and Javan, 1974
Ducas, T.W.; Javan, A., Measurement of microwave fine structure in OH infrared transitions using frequency mixing with metal-to-metal infrared diodes, J. Chem. Phys., 1974, 60, 1677. [all data]

Downey, Robinson, et al., 1977
Downey, G.D.; Robinson, D.W.; Smith, J.H., A pure-rotational collisionally pumped OH laser, J. Chem. Phys., 1977, 66, 1685. [all data]

Dousmanis, Sanders, et al., 1955
Dousmanis, G.C.; Sanders, T.M., Jr.; Townes, C.H., Microwave spectra of the free radicals OH and OD, Phys. Rev., 1955, 100, 1735. [all data]

Ehrenstein, 1963
Ehrenstein, G., Hyperfine structure in O¹⁷H and the OH dipole moment, Phys. Rev., 1963, 130, 669. [all data]

Poynter and Beaudet, 1968
Poynter, R.L.; Beaudet, R.A., Predictions of several OH λ doubling transitions suitable for radio astronomy, Phys. Rev. Lett., 1968, 21, 305. [all data]

Destombes, Marliere, et al., 1974
Destombes, J.-L.; Marliere, C.; Rohart, F.; Burie, J., Nouvelle analyse du spectre hertzien du radical hydroxyl, C.R. Acad. Sci. Paris, Ser. B, 1974, 278, 275. [all data]

Destombes and Marliere, 1975
Destombes, J.L.; Marliere, C., Measurement of hyperfine splitting in the OH radical by a radio-frequency microwave double resonance method, Chem. Phys. Lett., 1975, 34, 532. [all data]

Meerts and Dymanus, 1975
Meerts, W.L.; Dymanus, A., A molecular beam electric resonance study of the hyperfine Λ doubling spectrum of OH, OD, SH, and SD, Can. J. Phys., 1975, 53, 2123. [all data]

Meerts, 1977
Meerts, W.L., On the microwave spectrum of the X²Π state of the hydroxyl radical, Chem. Phys. Lett., 1977, 46, 24. [all data]

Radford, 1961
Radford, H.E., Microwave Zeeman effect of free hydroxyl radicals, Phys. Rev., 1961, 122, 114. [all data]

Churg and Levy, 1970
Churg, A.; Levy, D.H., The magnetic resonance spectrum of vibrationally excited OH and A prediciton of the radio-astronomy spectrum, Astrophys. J., 1970, 162, 161. [all data]

Clough, Curran, et al., 1971
Clough, P.N.; Curran, A.H.; Thrush, B.A., The e.p.r. spectrum of vibrationally excited hydroxyl radicals, Proc. R. Soc. London A, 1971, 323, 541. [all data]

Lee, Tam, et al., 1971
Lee, K.P.; Tam, W.G.; Larouche, R.; Woonton, G.A., Electron resonance of vibrationally excited OH radicals, Can. J. Phys., 1971, 49, 2207. [all data]

Hinkley, Walker, et al., 1973
Hinkley, R.K.; Walker, T.E.H.; Richards, W.G., On the e.p.r. spectrum of vibrationally excited hydroxyl radicals, Proc. R. Soc. London A, 1973, 331, 553. [all data]

Lee and Tam, 1974
Lee, K.P.; Tam, W.G., Molecular constants of vibrationally excited hydroxyl radical from electron paramagnetic resonance, Chem. Phys., 1974, 4, 434. [all data]

Carlone and Dalby, 1969
Carlone, C.; Dalby, F.W., Spectrum of the hydroxyl radical, Can. J. Phys., 1969, 47, 1945. [all data]

Fallon, Tobias, et al., 1961
Fallon, R.J.; Tobias, I.; Vanderslice, J.T., Potential energy curves for OH, J. Chem. Phys., 1961, 34, 167. [all data]

Horsley and Richards, 1969
Horsley, J.A.; Richards, W.G., Les forces interatomiques a grandes distances dans les etats excites du radical OH, J. Chim. Phys. Phys.-Chim. Biol., 1969, 66, 41. [all data]

Smith and Stella, 1975
Smith, Wm.H.; Stella, G., Lifetimes for OH and OD electronic states with resonance transitions in the region between 1700 and 1950 Å, J. Chem. Phys., 1975, 63, 2395. [all data]

Remy, 1971
Remy, F., Time resolved spectroscopy of a pulsed discharge through water vapor: observation of emissions from the C²Σ⁺ state of OH, Spectrosc. Lett., 1971, 4, 319. [all data]

Ray and Kelly, 1975
Ray, S.; Kelly, H.P., Oscillator strength for the D²Σ^--X²Π transition in OH, Astrophys. J., 1975, 202, 57. [all data]

Moore and Richards, 1971
Moore, E.A.; Richards, W.G., A reanalysis of the A²Σ⁺ - X²Π_i system of OH, Phys. Scr., 1971, 3, 223. [all data]

Elmergreen and Smith, 1972
Elmergreen, B.G.; Smith, W.H., Direct measurement of the lifetimes and predissociation probabilities for rotational levels of the OH and OD A²Σ⁺ states, Astrophys. J., 1972, 178, 557. [all data]

Anderson and Sutherland, 1973
Anderson, R.A.; Sutherland, R.A., Erratum: Radiative and predissociative lifetimes of the A²Σ⁺ state of OH [Ref.: J. Chem. Phys., 1973, Vol. 58, 1226], J. Chem. Phys., 1973, 59, 6690. [all data]

German, 1975
German, K.R., Direct measurement of the radiative lifetimes of the A²Σ⁺ (V' = 0) states of OH and OD, J. Chem. Phys., 1975, 62, 2584. [all data]

Gaydon and Wolfhard, 1951
Gaydon, A.G.; Wolfhard, H.G., Predissociation in the spectrum of OH; the vibrational and rotational intensity distribution in flames, Proc. R. Soc. London A, 1951, 208, 63. [all data]

Broida and Kane, 1953
Broida, H.P.; Kane, W.R., Rotational intensity distributions of OH and OD in an electrodeless discharge through water vapor, Phys. Rev., 1953, 89, 1053. [all data]

Naegeli and Palmer, 1967
Naegeli, D.W.; Palmer, H.B., Predissociation in the chemiluminescent emission spectrum of OH, J. Mol. Spectrosc., 1967, 23, 44. [all data]

Charton and Gaydon, 1958
Charton, M.; Gaydon, A.G., Excitation of spectra of OH in hydrogen flames and its relation to excess concentrations of free atoms, Proc. R. Soc. London A, 1958, 245, 84. [all data]

Gutman, Lutz, et al., 1968
Gutman, D.; Lutz, R.W.; Jacobs, N.F.; Hardwidge, E.A., Shock-tube study of OH chemiluminescence in the hydrogen-oxygen reaction, J. Chem. Phys., 1968, 48, 5689. [all data]

Palmer and Naegeli, 1968
Palmer, H.B.; Naegeli, D.W., Predissociation of chemiluminescent OH and OD, J. Mol. Spectrosc., 1968, 28, 417-421. [all data]

Michels and Harris, 1969
Michels, H.H.; Harris, F.E., Predissociation effects in the A²Σ⁺ state of the OH radical, Chem. Phys. Lett., 1969, 3, 441. [all data]

Gaydon and Kopp, 1971
Gaydon, A.G.; Kopp, I., Predissociation in the spectrum of OH; a reinterpretation, J. Phys. B:, 1971, 4, 752. [all data]

Palmer and Naegeli, 1973
Palmer, H.B.; Naegeli, D.W., On the crossing of the ⁴Σ^- and A²Σ⁺ states of OH, J. Chem. Phys., 1973, 59, 994. [all data]

Smith, Elmergreen, et al., 1974
Smith, W.H.; Elmergreen, B.G.; Brooks, N.H., Interactions among the lower valence states of the OH radical, J. Chem. Phys., 1974, 61, 2793. [all data]

Durmaz and Murrell, 1971
Durmaz, S.; Murrell, J.N., Predissociation by the continuum of a bound state without curve crossing. Application to the spectrum of OH, Trans. Faraday Soc., 1971, 67, 3395. [all data]

Julienne, Krauss, et al., 1971
Julienne, P.S.; Krauss, M.; Donn, B., Formation of OH through inverse predissociation, Astrophys. J., 1971, 170, 65. [all data]

Czarny and Felenbok, 1968
Czarny, J.; Felenbok, P., Etude a tres haute resolution de la transition B²Σ⁺ → A²Σ⁺ de OH et OD a l'aide d'une source haute frequence mise au point a cet effet, Ann. Astrophys., 1968, 31, 141. [all data]

Scarl and Dalby, 1971
Scarl, E.A.; Dalby, F.W., High-field Stark effects on the near ultraviolet spectrum of the hydroxyl radical, Can. J. Phys., 1971, 49, 2825. [all data]

Hogan and Davis, 1974
Hogan, P.; Davis, D.D., OH lifetime measurements of several K levels in the v' = 1 manifold of the A²Σ⁺ electronic state: excitation via A tunable UV laser, Chem. Phys. Lett., 1974, 29, 555. [all data]

Becker and Haaks, 1973
Becker, K.H.; Haaks, D., Measurement of the natural lifetimes and quenching rate constants of OH(²Σ⁺, v = 0,1) and OD(²Σ⁺, v = 0,1) radicals, Z. Naturforsch. A, 1973, 28, 249. [all data]

Becker, Haaks, et al., 1974
Becker, K.H.; Haaks, D.; Tatarczyk, T., The natural lifetime of OH (²Σ⁺, v=0, N=2, J=3/2) and its quenching by atomic hydrogen, Chem. Phys. Lett., 1974, 25, 564. [all data]

Brophy, Silver, et al., 1974
Brophy, J.H.; Silver, J.A.; Kinsey, J.L., Direct measurement of the radiative lifetime of the A²Σ⁺(v' = 0, K' = 1, J' = 3/2) state of OH and OD, Chem. Phys. Lett., 1974, 28, 418. [all data]

Bennett and Dalby, 1964
Bennett, R.G.; Dalby, F.W., Experimental determination of the oscillator strength of the violet system of OH, J. Chem. Phys., 1964, 40, 1414. [all data]

de Zafra, Marshall, et al., 1971
de Zafra, R.L.; Marshall, A.; Metcalf, H., Measurement of lifetime and g factors by level crossing and optical double resonance in the OH and OD free radicals, Phys. Rev. A: Gen. Phys., 1971, 3, 1557. [all data]

German, Bergeman, et al., 1973
German, K.R.; Bergeman, T.H.; Weinstock, E.M.; Zare, R.N., Zero-field level crossing and optical radio-frequency double resonance studies of the A²Σ⁺ states of OH and OD, J. Chem. Phys., 1973, 58, 4304. [all data]

Rouse and Engleman, 1973
Rouse, P.E.; Engleman, R., Jr., Oscillator strengths from line absorption in a high-temperature furnace. I. The (0,0) and (1,0) bands of the A²Σ⁺-X²Π_i transition in OH and OD, J. Quant. Spectrosc. Radiat. Transfer, 1973, 13, 1503. [all data]

Golden, Del Greco, et al., 1963
Golden, D.M.; Del Greco, F.P.; Kaufman, F., Experimental oscillator strength of OH, ²Σ⁺ → ²Π, by a chemical method, J. Chem. Phys., 1963, 39, 3034. [all data]

Anketell and Pery-Thorne, 1967
Anketell, J.; Pery-Thorne, A., Oscillator strengths in the ²Σ⁺-²Π band system of OH by the hook method, Proc. R. Soc. London A, 1967, 301, 343. [all data]

Krishnamachari and Broida, 1961
Krishnamachari, S.L.N.G.; Broida, H.P., Effect of molecular oxygen on the emission spectra of atomic oxygen-acetylene flames, J. Chem. Phys., 1961, 34, 1709. [all data]

Bonhoeffer and Reichardt, 1928
Bonhoeffer, K.F.; Reichardt, H., Zerfall von erhitztem wasserdampf in wasserstoff und freies hydroxyl, Z. Phys. Chem. Abt. A, 1928, 139, 75. [all data]

Oldenberg, 1935
Oldenberg, O., The lifetime of free hydroxyl, J. Chem. Phys., 1935, 3, 266. [all data]

Gaydon, Spokes, et al., 1960
Gaydon, A.G.; Spokes, G.N.; Suchtelen, J.V., Absorption spectra of low-pressure flames, Proc. R. Soc. London A, 1960, 256, 323. [all data]

Basco and Norrish, 1961
Basco, N.; Norrish, R.G.W., The production of vibrationally excited hydroxyl radicals under isothermal conditions by flash photolysis, Proc. R. Soc. London A, 1961, 260, 293. [all data]

Black and Porter, 1962
Black, G.; Porter, G., Vacuum ultra-violet flash photolysis of water vapour, Proc. R. Soc. London A, 1962, 266, 185. [all data]

Horne and Norrish, 1967
Horne, D.G.; Norrish, R.G.W., Rate of H-abstraction by OH from hydrocarbons, Nature (London), 1967, 215, 1373. [all data]

Moore and Broida, 1959
Moore, C.E.; Broida, H.P., OH in the solar spectrum, J. Res. Nat. Bur. Stand. Sect. A, 1959, 63, 279. [all data]

Tinti, 1968
Tinti, D.S., Absorption and emission spectra of OH and OD in solid Ne. Evidence for rotation, J. Chem. Phys., 1968, 48, 1459. [all data]

Bass and Broida, 1953
Bass, A.M.; Broida, H.P., A spectrophotometric atlas of the ²Σ⁺-²Π transition of OH, National Bureau of Standards Circular 541, Washington, D.C., 1953, 1. [all data]

Engleman, 1972
Engleman, R., Jr., Accurate wavenumbers of the A²Σ → X²Π (0, 0) and (1, 0) bands of OH and OD, J. Quant. Spectrosc. Radiat. Transfer, 1972, 12, 1347. [all data]

Nanes and Robinson, 1971
Nanes, R.; Robinson, D.W., Magnetic rotation spectra of the A²Σ⁺-X²Π_i transition of OH and OD, J. Chem. Phys., 1971, 55, 963. [all data]

Nicholls, 1956
Nicholls, R.W., The interpretation of intensity distributions in the CN violet, C₂ Swan, OH violet and O₂ Schumann-Runge band systems by use of their r-Centroids and Franck-Condon factors, Proc. Phys. Soc. London Sect. A, 1956, 69, 741. [all data]

Nicholls, Fraser, et al., 1959
Nicholls, R.W.; Fraser, P.A.; Jarmain, W.R., Transition probability parameters of molecular spectra arising from combustion processes, Combust. Flame, 1959, 3, 13. [all data]

Crosley and Lengel, 1975
Crosley, D.R.; Lengel, R.K., Relative transition probabilities and the electronic transition moment in the A-X system of OH, J. Quant. Spectrosc. Radiat. Transfer, 1975, 15, 579. [all data]

Learner, 1962
Learner, R.C.M., The influence of vibration-rotation interaction on intensities in the electronic spectra of diatomic molecules. I. The hydroxyl radical, Proc. R. Soc. London A, 1962, 269, 311. [all data]

Meinel, 1967
Meinel, H., Spektroskopischer Nachweis zweier OH-Gruppen bei nichtthermischer Anregugn, Z. Naturforsch. A, 1967, 22, 977. [all data]

Anketell and Learner, 1967
Anketell, J.; Learner, R.C.M., Vibration rotation interaction in OH and the transition moment, Proc. R. Soc. London A, 1967, 301, 355. [all data]

Veseth, 1971
Veseth, L., Corrections to the spin-orbit splitting in ²Π states of diatomic molecules, J. Mol. Spectrosc., 1971, 38, 228. [all data]

Meinel, 1950
Meinel, A.B., OH emission bands in the spectrum of the night sky. I., Astrophys. J., 1950, 111, 555. [all data]

Jones, 1955
Jones, A.V., Infra-red spectrum of the night sky near 10000 A, Nature (London), 1955, 175, 950. [all data]

Connes and Gush, 1959
Connes, M.J.; Gush, H.P., Spectroscopie du ciel nocturne dans l'infrarouge par transformation de fourier, J. Phys. Radium, 1959, 20, 915. [all data]

Kraus, 1957
Kraus, F., Uber die Anregungsbedingungen und die Intensitatsverhaltnisse der Infraroten OH-Banden, Z. Naturforsch. A, 1957, 12, 479. [all data]

Murphy, 1971
Murphy, R.E., Infrared emission of OH in the fundamental and first overtone bands, J. Chem. Phys., 1971, 54, 4852. [all data]

Acquista, Schoen, et al., 1968
Acquista, N.; Schoen, L.J.; Lide, D.R., Jr., Infrared spectrum of the matrix-isolated OH radical, J. Chem. Phys., 1968, 48, 1534. [all data]

Roux, d'Incan, et al., 1973
Roux, F.; d'Incan, J.; Cerny, D., Experimental oscillator strengths in the infrared vibration-rotation spectrum of the hydroxyl radical, Astrophys. J., 1973, 186, 1141. [all data]

Potter, Coltharp, et al., 1971
Potter, A.E., Jr.; Coltharp, R.N.; Worley, S.D., Mean radiative lifetime of vibrationally excited (v=9) hydroxyl. Rate of the reaction of vibrationally excited hydroxyl (v=9) with ozone, J. Chem. Phys., 1971, 54, 992. [all data]

Ferguson and Parkinson, 1963
Ferguson, A.F.; Parkinson, D., The hydroxyl bands in the nightglow, Planet. Space Sci., 1963, 11, 149. [all data]

d'Incan, Effantin, et al., 1971
d'Incan, J.; Effantin, C.; Roux, F., Intensites absolues et forces d'oscillateur de quelques raies des bandes de vibration-rotation 1-0 et 2-1 du radical OH, J. Quant. Spectrosc. Radiat. Transfer, 1971, 11, 1215. [all data]

Mies, 1974
Mies, F.H., Calculated vibrational transition probabilities of OH(X²Π), J. Mol. Spectrosc., 1974, 53, 150. [all data]

Heaps and Herzberg, 1952
Heaps, H.S.; Herzberg, G., Intensity distribution in the rotation-vibration spectrum of the OH molecule, Z. Phys., 1952, 133, 48. [all data]

Cashion, 1963
Cashion, K., A method for calculating vibrational transition probabilities, J. Mol. Spectrosc., 1963, 10, 182. [all data]

Ehrenstein, Townes, et al., 1959
Ehrenstein, G.; Townes, C.H.; Stevenson, M.J., Ground state Λ-doubling transitions of OH radical, Phys. Rev. Lett., 1959, 3, 40. [all data]

Radford, 1964
Radford, H.E., 18-cm Spectrum of OH, Phys. Rev. Lett., 1964, 13, 534. [all data]

ter Meulen and Dymanus, 1972
ter Meulen, J.J.; Dymanus, A., Beam-maser measurements of the ground-state transition frequencies of OH, Astrophys. J., 1972, 172, 21. [all data]

Turner, 1966
Turner, B.E., Einstein A coefficient for the λ doublet transitions of the ground state of OH, Nature (London), 1966, 212, 184-185. [all data]

Valtz and Soglasnova, 1973
Valtz, I.E.; Soglasnova, V.A., Lambda-doubling of the O¹⁷H molecule at microwave frequencies, Astrophys. Lett., 1973, 13, 23. [all data]

Powell and Lide, 1965
Powell, F.X.; Lide, D.R., Jr., Improved measurement of the electric-dipole moment of the hydroxyl radical, J. Chem. Phys., 1965, 42, 4201. [all data]

Meerts and Dymanus, 1973
Meerts, W.L.; Dymanus, A., Electric dipole moments of OH and OD by molecular beam electric resonance, Chem. Phys. Lett., 1973, 23, 45. [all data]

Barrett, 1967
Barrett, A.H., Radio observations of interstellar hydroxyl radicals, Science, 1967, 157, 881. [all data]

Robinson and McGee, 1967
Robinson, B.J.; McGee, R.X., OH molecules in the interstellar medium, Annu. Rev. Astron. Astrophys., 1967, 5, 183. [all data]

Cook, 1969
Cook, A.H., The hydroxyl molecule in interstellar space, Physica (Amsterdam), 1969, 41, 1. [all data]

ter Meulen, Meerts, et al., 1976
ter Meulen, J.J.; Meerts, W.L.; van Mierlo, G.W.M.; Dymanus, A., Observations of population inversion between the Λ-doublet states of OH, Phys. Rev. Lett., 1976, 36, 1031. [all data]

Carrington and Lucas, 1970
Carrington, A.; Lucas, J.D., Electron resonance of gaseous diatomic hydrides. I. ¹⁷O hyperfine and quadrupole interactions in OH and OD, Proc. R. Soc. London A, 1970, 314, 567. [all data]

Arnold, Whiting, et al., 1976
Arnold, J.O.; Whiting, E.E.; Sharbaugh, L.F., A nearly exact MCSCF + Cl calculation of the dissociation energy of OH, J. Chem. Phys., 1976, 64, 3251. [all data]

Notes

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• Symbols used in this document:
  

  EA	Electron affinity
  IE (evaluated)	Recommended ionization energy
  S°gas,1 bar	Entropy of gas at standard conditions (1 bar)
  ΔfH°gas	Enthalpy of formation of gas at standard conditions
  ΔrG°	Free energy of reaction at standard conditions
  ΔrH°	Enthalpy of reaction at standard conditions

• Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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