Hydrogen iodide

• Formula: HI
• Molecular weight: 127.91241
• IUPAC Standard InChI: InChI=1S/HI/h1H Copy

  
• IUPAC Standard InChIKey: XMBWDFGMSWQBCA-UHFFFAOYSA-N Copy
• CAS Registry Number: 10034-85-2
• Chemical structure:
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• Information on this page:
  • Gas phase thermochemistry data
  • Constants of diatomic molecules
  • References
  • Notes
• Other data available:
  • Phase change data
  • Reaction thermochemistry data
  • Henry's Law data
  • Gas phase ion energetics data
  • Ion clustering data
• Data at other public NIST sites:
  • Microwave spectra (on physics lab web site)
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Gas phase thermochemistry data

Go To: Top, 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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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 September, 1976

Notes

References

Go To: Top, Gas phase thermochemistry 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.

Cox, Wagman, et al., 1984
Cox, J.D.; Wagman, D.D.; Medvedev, V.A., CODATA Key Values for Thermodynamics, Hemisphere Publishing Corp., New York, 1984, 1. [all data]

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

Terwilliger and Smith, 1975
Terwilliger, D.T.; Smith, A.L., Autoionization in diatomics: measured line shape parameters and predicted photoelectron spectra for some autoionizing states of the hydrogen halides, J. Chem. Phys., 1975, 63, 1008. [all data]

Ginter, Tilford, et al., 1975
Ginter, M.L.; Tilford, S.G.; Bass, A.M., Electronic spectra and structure of the hydrogen halides. States associated with the (σ²π³)cσ and (σ²π³)cπ configurations of HI and DI, J. Mol. Spectrosc., 1975, 57, 271. [all data]

Price, 1938
Price, W.C., The absorption spectra of the halogen acids in the vacuum ultra-violet, Proc. Roy. Soc. (London), 1938, A167, 216. [all data]

Tilford, Ginter, et al., 1970
Tilford, S.G.; Ginter, M.L.; Bass, A.M., Electronic spectra and structure of the hydrogen halides. The b³Π_i and C¹Π states of HI and DI, J. Mol. Spectrosc., 1970, 34, 327. [all data]

Goodeve and Taylor, 1936
Goodeve, C.F.; Taylor, A.W.C., The continuous absorption spectrum of hydrogen iodide, Proc. R. Soc. London A, 1936, 154, 181. [all data]

Datta and Kundu, 1941
Datta, S.; Kundu, D.N., The continuous absorption spectra of the hydrogen-halides. Part III - HI, Proc. Natl. Inst. Sci. India, 1941, 7, 311. [all data]

Romand, 1949
Romand, J., Absorption ultraviolette dans la region de Schumann etude de: ClH, BrH et lH gazeux, Ann. Phys. (Paris), 1949, 4, 527. [all data]

Huebert and Martin, 1968
Huebert, B.J.; Martin, R.M., Gas-phase far-ultraviolet absorption spectrum of hydrogen bromide and hydrogen iodide, J. Phys. Chem., 1968, 72, 3046. [all data]

Ogilvie, 1971
Ogilvie, J.F., Semi-experimental determination of a repulsive potential curve for hydrogen iodide, Trans. Faraday Soc., 1971, 67, 2205. [all data]

Boyd and Thompson, 1952
Boyd, D.R.J.; Thompson, H.W., The fundamental vibration band of hydrogen iodide, Spectrochim. Acta, 1952, 5, 308. [all data]

Haeusler, Meyer, et al., 1964
Haeusler, C.; Meyer, C.; Barchewitz, P., Constantes de vibration et de rotation de l'acide iodhydrique gazeux etude des bandes d'absorption v_0-2 et v_0-4, J. Phys. (Paris), 1964, 25, 961. [all data]

Hurlock, Alexander, et al., 1971
Hurlock, S.C.; Alexander, R.M.; Rao, K.N.; Dreska, N., Infrared bands of HI and DI, J. Mol. Spectrosc., 1971, 37, 373. [all data]

Bernage, Niay, et al., 1974
Bernage, P.; Niay, P.; Houdart, R., Notes des membres et correspondants et notes presentees ou transmises par leurs soins, C.R. Acad. Sci. Paris, Ser. B, 1974, 278, 235. [all data]

Czerny, 1927
Czerny, M., Die rotationsspektren der halogenwasserstoffe, Z. Phys., 1927, 44, 235. [all data]

Palik, 1955
Palik, E.D., The pure rotational spectra of DBr, HI, and DI in the spectral region between 45 and 170 microns, J. Chem. Phys., 1955, 23, 217. [all data]

Cowan and Gordy, 1956
Cowan, M.; Gordy, W., Further extension of microwave spectroscopy in the submillimeter wave region, Phys. Rev., 1956, 104, 551. [all data]

De Lucia, Helminger, et al., 1971
De Lucia, F.C.; Helminger, P.; Gordy, W., Submillimeter-wave spectra and equilibrium structures of the hydrogen halides, Phys. Rev. A: Gen. Phys., 1971, 3, 1849. [all data]

Cherlow, Hyatt, et al., 1975
Cherlow, J.M.; Hyatt, H.A.; Porto, S.P.S., Raman scattering in hydrogen halide gases, J. Chem. Phys., 1975, 63, 3996. [all data]

Clear, Riley, et al., 1975
Clear, R.D.; Riley, S.J.; Wilson, K.R., Energy partitioning and assignment of excited states in the ultraviolet photolysis of HI and DI, J. Chem. Phys., 1975, 63, 1340. [all data]

Ogilvie and Koo, 1976
Ogilvie, J.F.; Koo, D., Dunham potential energy coefficients of the hydrogen halides and carbon monoxide, J. Mol. Spectrosc., 1976, 61, 332-336. [all data]

Watanabe, Nakayama, et al., 1962
Watanabe, K.; Nakayama, T.; Mottl, J., Ionization potentials of some molecules, J. Quant. Spectry. Radiative Transfer, 1962, 2, 369. [all data]

Lempka, Passmore, et al., 1968
Lempka, H.J.; Passmore, T.R.; Price, W.C., The photoelectron spectra and ionized states of the halogen acids, Proc. Roy. Soc. (London), 1968, A304, 53. [all data]

Frost, McDowell, et al., 1967
Frost, D.C.; McDowell, C.A.; Vroom, D.A., Photoelectron spectra of the halogens and the hydrogen halides, J. Chem. Phys., 1967, 46, 4255. [all data]

Tsai and Baer, 1974
Tsai, B.P.; Baer, T., Analysis of autoionizing Rydberg states in HI and CH₃I. Comments on Rydberg electron wavefunctions, J. Chem. Phys., 1974, 61, 2047. [all data]

Ameer and Beneschi, 1962
Ameer, G.; Beneschi, W., Line strengths and widths in hydrogen iodide, J. Chem. Phys., 1962, 37, 2699. [all data]

Benesch, 1963
Benesch, W., Simultaneous measurement of HI fundamental and overtone lines, J. Chem. Phys., 1963, 39, 1048. [all data]

Meyer, Haeusler, et al., 1965
Meyer, C.; Haeusler, C.; Barchewitz, P., Intensites et largeurs des raies de vibration-rotation de molecules diatomiques, J. Phys. (Paris), 1965, 26, 305. [all data]

Jacobi, 1967
Jacobi, N., Electrical anharmonicities of diatomic molecules, J. Mol. Spectrosc., 1967, 22, 76. [all data]

Tipping and Forbes, 1971
Tipping, R.H.; Forbes, A., Dipole moment function of HI, J. Mol. Spectrosc., 1971, 39, 65. [all data]

Van Dijk and Dymanus, 1968
Van Dijk, F.A.; Dymanus, A., Hyperfine structure of the rotational spectrum of HI in the submillimeter region, Chem. Phys. Lett., 1968, 2, 235. [all data]

van Dijk and Dymanus, 1970
van Dijk, F.A.; Dymanus, A., The electric dipole moment of HI and HBr, Chem. Phys. Lett., 1970, 5, 387. [all data]

Chamberlain and Gebbie, 1965
Chamberlain, J.E.; Gebbie, H.A., Sub-millimetre dispersion and rotational line strengths of the hydrogen halides, Nature (London), 1965, 208, 480. [all data]

Notes

Go To: Top, Gas phase thermochemistry data, Constants of diatomic molecules, References

• Symbols used in this document:
  

  S°gas	Entropy of gas at standard conditions
  S°gas,1 bar	Entropy of gas at standard conditions (1 bar)
  ΔfH°gas	Enthalpy of formation of gas at standard conditions

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