Hydrogen chloride

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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

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 H35Cl
Rydberg 1            200-210 eV
Hayes and Brown, 1972; Schwarz, 1975
Numerous absorption bands above 123000 cm-1, tentatively assigned to higher members of the Rydberg series starting with L and M and converging to A 2Σ+ of HCl+.
Terwilliger and Smith, 1973
M (1Σ+) (117811) [1529] 2         M ← X 117093
missing citation
L (1Σ+,1Π) 111280 1531 52 3        L ← X 110555
missing citation
Douglas and Greening, 1979
K 1Π (89861) [2604.6] Z   [9.230] 5   [-12.6E-4] 5  [1.3654] K ← X R 89680.5 Z
Douglas and Greening, 1979
H 1Σ+ (89120) [2093.8] Z   [8.4410]   [8.93E-4]  [1.4278] H ← X R 88684.5 Z
Douglas and Greening, 1979
E 1Σ+ (84193) [2138.6] Z   [6.6423]   [36.2]  [1.6096] E ← X R 83780.2 Z
Douglas and Greening, 1979
g (3Σ-)1 [84329.7] 6    [10.36] 7   [17E-4] 7  [1.289] g ← X 82847.4 Z
missing citation
f1 3Δ1 [84006.1] 6    [10.270] 8   [-13E-4] 8  [1.294] f1 ← X 82523.8 Z
missing citation
D 1Π [83972.0] 9    [9.794] 10   [20.5E-4] 10  [1.326] D ← X R 82489.7 Z
missing citation
d0 3Π0 [83753.6] 9    [9.404] 11   [-2.2E-4] 11  [1.353] d0 ← X R 82271.3 Z
missing citation
f2 3Δ2 [83497.7] 6    [10.851] 12   [29.5E-4] 12  [1.259] f2 ← X V 82015.4 Z
missing citation
f3 3Δ3 [83308.2] 6    [9.45] 8   [-1.3E-4] 8  [1.349] f3 ← X R 81825.9 Z
missing citation
d1 3Π1 [83255.6] 9    [9.768] 13   [8E-4] 13  [1.327] d1 ← X R 81773.3 Z
missing citation
d2 3Π2 [83083] 9    [8.632] 14   [-14E-4] 14  [1.412] d2 ← X R 81600.7 Z
missing citation
C 1Π 77575 15 [2684.0] Z 16  [9.333] 16    [1.358] C ← X 17 R 77485.3 Z
missing citation; Tilford, Ginter, et al., 1970
V 1Σ+ 77293.0 18 877.16 Z 16.04 19  2.727 -0.026  1.02E-4 19 0.20E-4 2.512 V ↔ X 20 R 76245.3 Z
Jacques, 1959; Jacques and Barrow, 1959; missing citation
V 1Σ+ 21           V → A 
Jacques and Barrow, 1959
b0 3Π0 (75617) 15 [2712]   [10.36] 22     [1.289] b0 ← X 23 75490.4 Z
Price, 1938; missing citation
b1 3Π1 (75195) 15 (2900) (79)  [9.87] 22     [1.320] b1 ← X R 75142.6 Z
Price, 1938; missing citation
b2 3Π2 [76322.2] 15    [9.18] 22     [1.369] b2 ← X 23 R 74839.9 Z
Price, 1938; missing citation
A (1Π) 24 25           A ← X 
Datta and Banerjee, 1941; Romand, 1949
X 1Σ+ 0 2990.9463 26 52.8186 27 0.22437 10.593416 26 28 0.307181 29  5.3194E-4 28 30  1.274552 31 32  
Rank, Eastman, et al., 1962; Rank, Rao, et al., 1965
Rotation spectrum 33 34
Hansler and Oetjen, 1953; Jones and Gordy, 1964; Rosenberg, Lightman, et al., 1972
Raman cross sections
Kaiser, 1970; de Leeuw and Dymanus, 1973
Mol. beam electric reson. 35
Kaiser, 1970; de Leeuw and Dymanus, 1973
Mol. beam magnetic reson. 36
Code, Khosla, et al., 1968


1Rydberg series corresponding to excitation of a 2p electron.
2v=0...5 observed. Assigned as 3pσ3pπ4 5sσ. 39
3Assigned as 3pσ3pπ4 4pσ/π. 39
4Many other absorption bands in the region 83000 - 93000 cm-1 corresponding to Rydberg states strongly perturbed by the V 1Σ+ state which itself gives rise to many perturbed bands.
5Average B, D values; B(R,P)-B(Q) = +0.385.
6Configuration ...σ2π3 4pπ.
7Average B, D values; B(1+)-B(1-) = - 0.060.
8Refers to Δ+; Q branch not resolved.
9Configuration ...σ2π3 4pσ.
10Average B, D values; B(Π+)-B(Π-) = +0.063.
11Average B, D values; B(Π+)-B(Π-) = -0.040.
12Average B, D values; B(Δ+)-B(Δ-) = -0.030.
13Average B, D values; B(Π+)-B(Π-) = -0.160.
14Average B, D values; B(Π+)-B(Π-) = -0.667.
15Configuration σ2π3 4sσ.
16v=1,2,3 are increasingly diffuse; B1 = 9.296. Tilford, Ginter, et al., 1970 give ωe = 2817.5, ωexe = 66.0, Be = 9.44, αe = 0.15.
17A1so observed in inert matrices Boursey, 1975.
18Typica1 "V" state with configuration ... σπ4 σ*.
19missing note
20Very extended progression in absorption, not yet analyzed in detail. The higher vibrational levels are strongly perturbed by Rydberg states Tilford and Ginter, 1971, Douglas and Greening, 1979. The vibrational and rotational constants given were obtained from the emission spectrum with v≤3 Jacques, 1959, Jacques and Barrow, 1959 but because of the perturbations have only very limited meaning.
21Continuous absorption starting at 44000 cm-1, maximum 40 at 65500 cm-1.
22Diffuse rotational structure; 1-0 and 2-0 are increasingly diffuse.
23The b2←X and b0←X components have only 1/50 of the intensity of b1←X.
24Configuration ...σ2π3 σ*.
25Continuous aabsorption starting at 44000 cm-1, maximum at 65500 cm-1.
26Applying the Dunham corrections Rank, Rao, et al., 1965 obtain ωe = 2991.0904 and Be = 10.593553. Additional corrections (adiabatic, non- adiabatic) discussed by Bunker, 1972. Vibrational levels up to v=5 have been observed in infrared absorption Rank, Birtley, et al., 1960, Rank, Eastman, et al., 1962, Rank, Rao, et al., 1965 and emission Mould, Price, et al., 1960, higher levels in the V→X bands Jacques, 1959, Jacques and Barrow, 1959. Dunham potential coefficients Ogilvie and Koo, 1976. Most recent ab initio values of the ground state molecular constants Meyer and Rosmus, 1975; charge distribution Cade, Bader, et al., 1969.
27ωeze = -0.01218 Rank, Rao, et al., 1965.
28Slightly different constants in Plyler and Tidwell, 1960, Levy, Rossi, et al., 1965, Levy, Rossi, et al., 1966. These papers and Webb and Rao, 1968 give also constants for H37Cl.
29+0.0017724(v+1/2)2 - 0.0001201(v+1/2)3.
30-7.510E-6(v+1/2) + 4.00E-7(v+1/2)2; higher order terms in Rank, Rao, et al., 1965. See also Herman and Asgharian, 1966.
31Uncorrected value from the Be(=Y01) given in the table. The internuclear distance at the minimum of the Born-Oppenheimer curve is re = 1.2746149 Bunker, 1972, Watson, 1973.
32Rot.-vibr. Bands 41 34
33Absolute intensity measurements Chamberlain and Gebbie, 1965, Sanderson, 1967.
34Pressure-induced shifts (by foreign gases) of rotation-vibration and rotation lines Rank, Eastman, et al., 1960, Ben-Reuven, Kimel, et al., 1961, Gebbie and Stone, 1963, Jaffe, Friedmann, et al., 1963, Jaffe, Hirshfeld, et al., 1964. For discussions of pressure-induced bands and pure rotation lines (ΔJ=2) see Atwood, Vu, et al., 1967, Weiss and Cole, 1967. Self and foreign-gas line broadening Benedict, Herman, et al., 1956, Babrov, Ameer, et al., 1959, Goldring and Benesch, 1962, Jaffe, Kimel, et al., 1962, Plyler and Thibault, 1962, Alamichel and Legay, 1966, Levy, Mariel-Piollet, et al., 1970, Toth, Hunt, et al., 1970, Rich and Welsh, 1971, Rosenberg, Lightman, et al., 1972. Infrared absorption in liquid and solid phases Katz and Ron, 1970, Khatibi and Vu, 1972.
35μel(v=0,1,2)= 1.1085, 1.1390, 1.1685 D, respectively Kaiser, 1970. Dipole moment function Kaiser, 1970, Smith, 1973; see also Bunker, 1973, Kaiser, 1974. gJ = 0.4594, also quadrupole and other hyperfine coupling constants Kaiser, 1970, de Leeuw and Dymanus, 1973; see also Tokuhiro, 1967, Bunker, 1973.
36Proton spin - rotation interaction constant Leavitt, Baker, et al., 1961, Code, Khosla, et al., 1968.
37From D00(H2), D00(Cl2), and ΔHof0(HCl)
38From the photoelectron spectrum Frost, McDowell, et al., 1967, Lempka, Passmore, et al., 1968, Weiss, Lawrence, et al., 1970; photoionization measurements give similar results Watanabe, Nakayama, et al., 1962, Nicholson, 1965. A somewhat smaller I.P.(12.730 eV) may be derived from the second band system in the photoelectron spectrum at 16.254 eV corresponding to A 2Σ+ of HCl+. Higher ionization potentials at 207.1 and 208.7 eV correspond to the removal of a 2p electron Hayes and Brown, 1972.
39Strongly broadened by preionization (lifetime τ= 1.1E-14 s) Terwilliger and Smith, 1973.
40Absorption coefficient k=40.
41Absolute intensities (cm-2atm-1) of the 1-0 band: 130 Benedict, Herman, et al., 1956 2-0 band: 2.9 Benedict, Herman, et al., 1956 3.70 Jaffe, Kimel, et al., 1962, Toth, Hunt, et al., 1970 3-0 band: 0.023 Benedict, Herman, et al., 1956


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.

Hayes and Brown, 1972
Hayes, W.; Brown, F.C., Absorption by some molecular gases in the extreme ultraviolet, Phys. Rev. A: Gen. Phys., 1972, 6, 21. [all data]

Schwarz, 1975
Schwarz, W.H.E., Interpretation of the core electron excitation spectra of hydride molecules and the properties of hydride radicals, Chem. Phys., 1975, 11, 217. [all data]

Terwilliger and Smith, 1973
Terwilliger, D.T.; Smith, A.L., Analysis of autoionizing Rydberg states in the vacuum ultraviolet absorption spectrum of HCl and DCl, J. Mol. Spectrosc., 1973, 45, 366. [all data]

Douglas and Greening, 1979
Douglas; Greening, Unpublished cited in Huber and Herzberg, 1979, 1979, 287. [all data]

Tilford, Ginter, et al., 1970
Tilford, S.G.; Ginter, M.L.; Vanderslice, J.T., Electronic spectra and structure of the hydrogen halides. The b3Πi and C1Π states of HCl and DCl, J. Mol. Spectrosc., 1970, 33, 505. [all data]

Jacques, 1959
Jacques, D. Phil. Thesis, Oxford, 1959, 1. [all data]

Jacques and Barrow, 1959
Jacques, J.K.; Barrow, R.F., The transition v1Σ+-x1Σ+ in hydrogen chloride, Proc. Phys. Soc. London, 1959, 73, 538. [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]

Datta and Banerjee, 1941
Datta, S.; Banerjee, S., The continuous absorption spectra of the hydrogen-halides. Part II. HCl, Proc. Natl. Inst. Sci. India, 1941, 7, 305. [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]

Rank, Eastman, et al., 1962
Rank, D.H.; Eastman, D.P.; Rao, B.S.; Wiggins, T.A., Rotational and vibrational constants of the HCl35 and DCl35 molecules, J. Opt. Soc. Am., 1962, 52, 1. [all data]

Rank, Rao, et al., 1965
Rank, D.H.; Rao, B.S.; Wiggins, T.A., Molecular constants of HCl35, J. Mol. Spectrosc., 1965, 17, 122. [all data]

Hansler and Oetjen, 1953
Hansler, R.L.; Oetjen, R.A., The infrared spectra of HCl, DCl, HBr, and NH3 in the region from 40 to 140 microns, J. Chem. Phys., 1953, 21, 1340. [all data]

Jones and Gordy, 1964
Jones, G.; Gordy, W., Extension of submillimeter wave spectroscopy below a half-millimeter wavelength, Phys. Rev., 1964, 135, 295. [all data]

Rosenberg, Lightman, et al., 1972
Rosenberg, A.; Lightman, A.; Ben-Reuven, A., Interferometric measurements of the pure rotational spectra of HCl and DCl, J. Quant. Spectrosc. Radiat. Transfer, 1972, 12, 219. [all data]

Kaiser, 1970
Kaiser, E.W., Dipole moment and hyperfine parameters of H35Cl and D35Cl, J. Chem. Phys., 1970, 53, 1686. [all data]

de Leeuw and Dymanus, 1973
de Leeuw, F.H.; Dymanus, A., Magnetic properties and molecular quadrupole moment of HF and HCl by molecular-beam electric-resonance spectroscopy, J. Mol. Spectrosc., 1973, 48, 427. [all data]

Code, Khosla, et al., 1968
Code, R.F.; Khosla, A.; Ozier, I.; Ramsey, N.F.; Yi, P.N., Nuclear magnetic hyperfine spectra of H35Cl and H37Cl, J. Chem. Phys., 1968, 49, 1895. [all data]

Boursey, 1975
Boursey, E., Electronic excitation of HCl trapped in inert matrices, J. Chem. Phys., 1975, 62, 3353. [all data]

Tilford and Ginter, 1971
Tilford, S.G.; Ginter, M.L., Electronic spectra and structure of the hydrogen halides: states associated with the (σ2π3) cπ and (σ2π3) cσ configurations of HCl and DCl, J. Mol. Spectrosc., 1971, 40, 568. [all data]

Bunker, 1972
Bunker, P.R., On the breakdown of the Born-Oppenheimer approximation for a diatomic molecule, J. Mol. Spectrosc., 1972, 5, 478. [all data]

Rank, Birtley, et al., 1960
Rank, D.H.; Birtley, W.B.; Eastman, D.P.; Rao, B.S.; Wiggins, T.A., Precise measurements of some infrared bands of hydrogen chloride, J. Opt. Soc. Am., 1960, 50, 1275. [all data]

Mould, Price, et al., 1960
Mould, H.M.; Price, W.C.; Wilkinson, G.R., Infra-red emission from gases excited by a radio-frequency discharge, Spectrochim. Acta, 1960, 16, 479. [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]

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]

Cade, Bader, et al., 1969
Cade, P.E.; Bader, R.F.W.; Henneker, W.H.; Keaveny, I., Molecular charge distributions and chemical binding. IV. The second-row diatomic hydrides AH, J. Chem. Phys., 1969, 50, 5313. [all data]

Plyler and Tidwell, 1960
Plyler, E.K.; Tidwell, E.D., The rotational constants of hydrogen chloride, Z. Elektrochem., 1960, 64, 717. [all data]

Levy, Rossi, et al., 1965
Levy, A.; Rossi, I.; Joffrin, C.; Van Thanh, N., Spectre de vibration-rotation de l'acide chlorhydrique gazeux. Etude de la bande v0→2 a 1,7 micron, J. Chim. Phys. Phys.-Chim. Biol., 1965, 62, 600. [all data]

Levy, Rossi, et al., 1966
Levy, A.; Rossi, I.; Haeusler, C., Constantes de vibration-rotation de l'acide chlorhydrique gazeux etude des bandes vo→2 et vo→3, J. Phys. (Paris), 1966, 27, 526. [all data]

Webb and Rao, 1968
Webb, D.U.; Rao, K.N., Vibration rotation bands of heated hydrogen halides, J. Mol. Spectrosc., 1968, 28, 121. [all data]

Herman and Asgharian, 1966
Herman, R.M.; Asgharian, A., Finite nuclear mass effects on the centrifugal stretching constant in H35Cl, J. Chem. Phys., 1966, 45, 2433. [all data]

Watson, 1973
Watson, J.K.G., The isotope dependence of the equilibrium rotational constants in 1Σ states of diatomic molecules, J. Mol. Spectrosc., 1973, 45, 99. [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]

Sanderson, 1967
Sanderson, R.B., Measurement of rotational line strengths in HCl by asymmetric Fourier transform techniques, Appl. Opt., 1967, 6, 1527. [all data]

Rank, Eastman, et al., 1960
Rank, D.H.; Eastman, D.P.; Birtley, W.B.; Wiggins, T.A., Perturbation of molecular rotation-vibration energy levels by rare gases, J. Chem. Phys., 1960, 33, 323. [all data]

Ben-Reuven, Kimel, et al., 1961
Ben-Reuven, A.; Kimel, S.; Hirshfeld, M.A.; Jaffe, J.H., Theory and measurement of pressure-induced shifts of HCl lines due to noble gases, J. Chem. Phys., 1961, 35, 955. [all data]

Gebbie and Stone, 1963
Gebbie, H.A.; Stone, N.W.B., Measurement of widths and shifts of pure rotation lines of hydrogen chloride perturbed by rare gases, Proc. Phys. Soc. London, 1963, 82, 309. [all data]

Jaffe, Friedmann, et al., 1963
Jaffe, J.H.; Friedmann, H.; Hirshfeld, M.A.; Ben-Reuven, A., Pressure-induced shifts of molecular lines in emission and in absorption, J. Chem. Phys., 1963, 39, 1447. [all data]

Jaffe, Hirshfeld, et al., 1964
Jaffe, J.H.; Hirshfeld, M.A.; Ben-Reuven, A., Pressure-induced shifts of DCl lines due to HCl: shift oscillation, J. Chem. Phys., 1964, 40, 1705. [all data]

Atwood, Vu, et al., 1967
Atwood, M.R.; Vu, H.; Vodar, B., Forme et structures fines de la bande induite par la pression dans la bande fondamentale de vibration-rotation des molecules HF, HCl et HBr, Spectrochim. Acta, 1967, 23, 553. [all data]

Weiss and Cole, 1967
Weiss, S.; Cole, R.H., Pressure-induced rotational quadrupole spectra of HCl and HBr, J. Chem. Phys., 1967, 46, 644. [all data]

Benedict, Herman, et al., 1956
Benedict, W.S.; Herman, R.; Moore, G.E.; Silverman, S., The strengths, widths, and shapes of infrared lines. II. The HCl fundamental, Can. J. Phys., 1956, 34, 850. [all data]

Babrov, Ameer, et al., 1959
Babrov, H.; Ameer, G.; Benesch, W., Line strengths and widths in the HCl fundamental band, J. Mol. Spectrosc., 1959, 3, 185. [all data]

Goldring and Benesch, 1962
Goldring, H.; Benesch, W., Widths of HCl overtone lines at various temperatures, Can. J. Phys., 1962, 40, 1801. [all data]

Jaffe, Kimel, et al., 1962
Jaffe, J.H.; Kimel, S.; Hirshfeld, M.A., Refraction spectrum of gases in the infrared intensities and widths of lines in the 2-0 band of HCl, Can. J. Phys., 1962, 40, 113. [all data]

Plyler and Thibault, 1962
Plyler, E.K.; Thibault, R.J., Foreign gas broadening of the lines of hydrogen chloride and carbon monoxide, J. Res. Nat. Bur. Stand. Sect. A, 1962, 66, 435. [all data]

Alamichel and Legay, 1966
Alamichel, C.; Legay, F., Etude de la dispersion dans le doublet isotopique R2 de la premiere bande harmonique de vibration-rotation de HCl, J. Phys. (Paris), 1966, 27, 233. [all data]

Levy, Mariel-Piollet, et al., 1970
Levy, A.; Mariel-Piollet, E.; Bouanich, J.-P.; Haeusler, C., Spectre de vibration-rotation du gaz chlorhydrique comprime. Intensites et largeurs de raies dans la bande v0-2, J. Quant. Spectrosc. Radiat. Transfer, 1970, 10, 203. [all data]

Toth, Hunt, et al., 1970
Toth, R.A.; Hunt, R.H.; Plyler, E.K., Line strengths, line widths, and dipole moment function for HCl, J. Mol. Spectrosc., 1970, 35, 110. [all data]

Rich and Welsh, 1971
Rich, N.H.; Welsh, H.L., Measurement of the pressure broadening of the rotational Raman lines of HCl, Chem. Phys. Lett., 1971, 11, 292. [all data]

Katz and Ron, 1970
Katz, B.; Ron, A., Far infrared spectra of HCl and DCl in a nitrogen matrix, Chem. Phys. Lett., 1970, 7, 357. [all data]

Khatibi and Vu, 1972
Khatibi, P.; Vu, H., Spectres d'absorption infrarouge de HCl et de HBr en phases denses. I. Spectres dans le fondamental de vibration-rotation, J. Chim. Phys. Phys.-Chim. Biol., 1972, 69, 654. [all data]

Smith, 1973
Smith, F.G., Dipole moment function and vibration-rotation matrix elements of HCl35 and DCl35, J. Quant. Spectrosc. Radiat. Transfer, 1973, 13, 717. [all data]

Bunker, 1973
Bunker, P.R., The breakdown of the Born-Oppenheimer approximation for a diatomic molecule: the dipole moment and nuclear quadrupole coupling constants, J. Mol. Spectrosc., 1973, 45, 151. [all data]

Kaiser, 1974
Kaiser, E.W., Note: Comment to "Dipole moment function and vibration-rotation matrix elements of HCl35 and DCl35", J. Quant. Spectrosc. Radiat. Transfer, 1974, 14, 317. [all data]

Tokuhiro, 1967
Tokuhiro, T., Vibrational and rotational effects on the nuclear quadrupole coupling constants in hydrogen, deuterium, and tritium halides, J. Chem. Phys., 1967, 47, 109. [all data]

Leavitt, Baker, et al., 1961
Leavitt, J.A.; Baker, M.R.; Nelson, H.M.; Ramsey, N.F., Proton radio-frequency spectrum of HCl35, Phys. Rev., 1961, 124, 1482. [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]

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]

Weiss, Lawrence, et al., 1970
Weiss, M.J.; Lawrence, G.M.; Young, R.A., Photoelectron spectroscopy of HCI and DCI using molecular beams, J. Chem. Phys., 1970, 52, 2867. [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]

Nicholson, 1965
Nicholson, A.J.C., Photoionization-efficiency curves. II. False and genuine structure, J. Chem. Phys., 1965, 43, 1171. [all data]

Huber and Herzberg, 1979
Huber, K.P.; Herzberg, G., Molecular Spectra and Molecular Structure. IV. Constants of Diatomic Molecules, Van Nostrand Reinhold Company, New York, 1979, 716. [all data]


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