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Gas phase ion energetics 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.

Data evaluated as indicated in comments:
L - Sharon G. Lias

Data compiled as indicated in comments:
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
B - John E. Bartmess

View reactions leading to C2+ (ion structure unspecified)

Quantity Value Units Method Reference Comment
IE (evaluated)11.4 ± 0.3eVN/AN/AL

Electron affinity determinations

EA (eV) Method Reference Comment
3.2730 ± 0.0080LPESArnold, Bradforth, et al., 1991B
3.265 ± 0.022LPESErvin, Gronert, et al., 1990B
3.391 ± 0.017LPDJones, Mead, et al., 1980B
3.30 ± 0.10LPESYang, Taylor, et al., 1989EA given is Vertical Detachment Energy. probably linear structure.; B
3.540 ± 0.050PDFeldman, 1970B
3.30 ± 0.20EIAELocht and Momigny, 1970From C2H2, C2H4; B
>2.89998EIAETrepka and Neuert, 1963From C2H4; B
>2.90 ± 0.50EIAEThynne and MacNiel, 1971From C2H4; B
4.0 ± 1.0EIAEHonig, 1954From graphite; B

Ionization energy determinations

IE (eV) Method Reference Comment
11.41 ± 0.30CIELReid, Ballantine, et al., 1995LL
11.92 ± 0.09DERPlessis and Marmet, 1986LBLHLM
12.15DERHuber and Herzberg, 1979LLK
11.1 ± 0.5EIGupta and Gingerich, 1979LLK
10.9 ± 0.4EICocke and Gingerich, 1974LLK
11.1 ± 1.0EICocke and Gingerich, 1972LLK
12.0 ± 0.6EIDrowart, Burns, et al., 1959RDSH
13.EIField, Franklin, et al., 1957RDSH

Constants of diatomic molecules

Go To: Top, Gas phase ion energetics 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 JULY, 1976

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 12C2
Theoretical work and potential functions Read and Vanerslice, 1962 Fougere and Nesbet, 1966 Verhaegen, Richards, et al., 1967 Verhaegen, 1968.
F 1Piu [75456.9] [1557.5] Z   1.645 0.019  0.000006  1.307 F larrow X R 74532.9 Z
missing citation
g 3Deltag [73183.6] 1 [1458.06] Z   1.5238 0.170  0.0000066  1.3579 g larrow a R 71649.6 Z
missing citation
f 3Sigmag- 71045.8 1360.5 Z 14.8  1.448 2 0.04 3 0.006 0.000010  1.393 f larrow a R 70188.4 Z
missing citation
E 1Sigmag+ 55034.7 1671.50 Z 40.02 0.248 1.7897 0.0387 4 -0.00055 0.0000083 0.0000006 1.2529 E rarrow A 5 V 46668.3 Z
missing citation
d 1Sigmau+ 43239.44 1829.57 Z 13.94  1.8332 6 0.0196  0.00000732 6  1.238 D lrarrow X 7 43226.74 6 Z
missing citation; Norrish, Porter, et al., 1952; Messerle, 1968
e 3Pig 40796.65 8 1106.56 Z 39.26 2.805 9 1.1922 0.0242  0.0000063 0.00000029 1.5351 e rarrow a 10 R 39806.46 Z
missing citation
C' 1PigPreliminary constants from perturbations in C 1Pig; see Messerle and Krauss, 1967.
C 1Pig 34261.3 1809.1 Z 15.81 11  1.7834 0.018 11  0.0000068  1.2552 C rarrow A 12 VR 25969.19 Z
Dieke and Lochte-Holtgreven, 1930; Herzberg and Sutton, 1940; Herzberg, 1945; Cisak, Dabrowska, et al., 1969
d 3Pig 20022.50 13 1788.22 Z 16.440 -0.5067 14 1.7527 15 0.01608 -0.001274 0.00000674 0.000000103 1.2661 d lrarrow a 16 VR 19378.44 Z
missing citation; Bugrim, Lyutyi, et al., 1965; missing citation; Phillips and Davis, 1968
           (d larrow X) 17 
c 3Sigmau+ 13312.1 1961.6 18 13.7  1.87 18     1.23  
A 1Piu 8391.00 1608.35 Z 12.078 -0.0119 1.6134 20 0.01686 19 -0.000054 0.00000644 19 0.000000036 1.31843 A lrarrow X 21 R 8268.16 Z
Ballik and Ramsay, 1963
b 3Sigmag- 6434.27 1470.45 Z 11.19 0.028 22 1.49852 23 0.01634 -0.000087 24 0.00000622  1.36928 b rarrow a 25 R 5632.7 Z
missing citation
a 3Piu 716.24 26 1641.35 Z 11.67  1.63246 27 0.01661  0.00000644  1.31190  
X 1Sigmag+ 0 1854.71 Z 13.340 28 -0.172 28 1.81984 0.01765 28 -0.00023 0.00000692 28 0.000000081 1.24253  


1A0= -8.8+0.020J; A1= -7.4.
2Spin splitting constant lambda ~0.41.
3missing note
4Rotational constants reevaluated; Freymark, 1951 gives Be = 1.7930, alphae = 0.0421.
5Franck-Condon factors Halmann and Laulicht, 1966; electronic transition moment Cooper and Nicholls, 1975.
6From Messerle, 1968; slightly different constants in Landsverk, 1939. betae~3E-8.
7Radiative lifetime tau=l4.6 ns Smith, 1969, f00= 0.055 Smith, 1969. The corresponding electronic transition moment is in only moderate agreement with Cooper and Nicholls, 1975. Franck-Condon factors Nicholls, Fraser, et al., 1959, Halmann and Laulicht, 1966.
8A not determined, but much smaller than for a 3Piu.
9omegaeze= -0.1271.
10Franck-Condon factors Nicholls, Fraser, et al., 1959, Jain, 1964, Halmann and Laulicht, 1966: el. trans. moment Cooper and Nicholls, 1975.
11The DeltaG and Bv curves are irregular Phillips, 1950, Messerle and Krauss, 1967, 2 and cannot be represented by the constants given without the use of higher order terms. The perturbation is strongest near v=5. Breaking-off at high J observed Messerle and Krauss, 1967 in v=0, 1, 2.
12Franck-Condon factors Nicholls, Fraser, et al., 1959, Halmann and Laulicht, 1966; el. trans. moment Cooper and Nicholls, 1975.
13A= -16.9.
14 Kini and Savadatti, 1969 have observed bands up to v'=14
15Numerous small perturbations by higher levels of b 3Sigmag- Callomon and Gilby, 1963 and X 1Sigmag+ Phillips, 1968 and by unidentified states. Swan bands emitted in low-pressure oxy-acetylene flames show a distinct intensity alternation ascribed to excitation by collisions with c 3Sigmau+ carbon molecules Bleekrode and Nieuwpoort, 1965, Bleekrode, 1967. Under certain conditions in discharges through CO the v'=6 progression of the Swan system appears almost exclusively and was at one time considered as a separate band system, the so-called high-pressure bands of carbon Herzberg, 1946, Kunz, Harteck, et al., 1967, Meinel and Messerle, 1968*. Isotope studies Dhumwad and Narasimham, 1968 leave no doubt that the high-pressure bands are the v'=6 progression of the Swan system.
16Radiative lifetime tau = 170 ns Smith, 1969, in reasonable agreement with Fink and Welge, 1967 but much shorter than Jeunehomme and Schwenker, 1965. f values obtained from the lifetime measurements as well as by other methods Fairbairn, 1966, Harrington, Modica, et al., 1966, Sviridov, Sobolev, et al., 1966, Arnold, 1968 have been reviewed in Danylewych and Nicholls, 1974. The latter authors' expression for the r dependence of the electronic transition moment was placed on an absolute scale using an average f00 = 0.020. For a more recent measurement of the electronic transition moment see Cooper and Nicholls, 1975. Franck-Condon factors Nicholls, Fraser, et al., 1959, Jain, 1964, Ortenberg, 1964, Spindler, 1965, Halmann and Laulicht, 1966.
17In solid matrices; tentative assignment by Barger and Broida, 1965 who also report the observation of dlarrowa. See, however, Weltner and McLeod, 1966.
18From perturbations in A 1Piu Ballik and Ramsay, 1963.
19Very slightly revised constants in Marenin and Johnson, 1970 based on the same data.
20Lambda-type doubling, Deltavef = -0.00023J(J+1). Perturbations by c 3Sigmau+.
21f00 = 0.0025; see Roux, Cerny, et al., 1976 for a comparison with other absolute measurements. Reasonably consistent with the electronic transition moment obtained by Cooper and Nicholls, 1975. Franck-Condon factors Nicholls, Fraser, et al., 1959, Ortenberg, 1964, Spindler, 1965, Halmann and Laulicht, 1966.
22 Callomon and Gilby, 1963
23Spin-splitting parameters lambda0 = 0.11, gamma0 = -0.00365 Veseth, 1975. Small perturbations by levels of X 1Sigmag+ Ballik and Ramsay, 1963, 2.
24 Callomon and Gilby, 1963.
25Franck-Condon factors Halmann and Laulicht, 1966; electronic transition moment Cooper and Nicholls, 1975.
26A = -15.25; Veseth, 1975 gives additional spin-coupling constants.
27Lambda-type doubling; see Ballik and Ramsay, 1963, 2 and Veseth, 1975.
28From Ballik and Ramsay, 1963, very slightly revised constants in Marenin and Johnson, 1970 based on the same data.
29Average of thermochemical values Brewer, Hicks, et al., 1962, Kordis and Gingerich, 1973. Smaller values of 6.07 and 6.11 eV have been derived on the basis of a somewhat doubtful extrapolation of the vibrational levels in d 3Pig Messerle and Krauss, 1967, 3 and of an extrapolated limiting curve of the C 1Pig state Messerle and Krauss, 1967. See also Drowart, Burns, et al., 1959.
30From photoionization and heat of formation of C2N2 Dibeler and Liston, 1967.


Go To: Top, Gas phase ion energetics 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.

Arnold, Bradforth, et al., 1991
Arnold, D.W.; Bradforth, S.E.; Kitsopoulos, T.N.; Neumark, D.M., Vibrationally Resolved Spectra of C2-C11 by Anion Photoelectron Spectroscopy, J. Chem. Phys., 1991, 95, 12, 8753, https://doi.org/10.1063/1.461211 . [all data]

Ervin, Gronert, et al., 1990
Ervin, K.M.; Gronert, S.; Barlow, S.E.; Gilles, M.K.; Harrison, A.G.; Bierbaum, V.M.; DePuy, C.H.; Lin, W.C., Bonds Strengths of Ethylene and Acetylene, J. Am. Chem. Soc., 1990, 112, 15, 5750, https://doi.org/10.1021/ja00171a013 . [all data]

Jones, Mead, et al., 1980
Jones, P.L.; Mead, R.D.; Kohler, B.E.; Rosner, S.D.; Lineberger, W.C., Photodetachment spectroscopy of C2- autodetaching resonances, J. Chem. Phys., 1980, 73, 4419. [all data]

Yang, Taylor, et al., 1989
Yang, S.; Taylor, K.J.; Craycraft, M.J.; Conceicao, J.; Pettiette, C.L.; Cherhnovsky, O.; Smalley, R.E., UPS of 2-30 Atom Carbon Clusters: Chains and Rings, Chem. Phys. Lett., 1989, 144, 5-6, 431, https://doi.org/10.1016/0009-2614(88)87291-9 . [all data]

Feldman, 1970
Feldman, D., Photoablosung von Elektronen bei einigen Stabilen Negativen Ionen, Z. Naturfor., 1970, 25A, 621. [all data]

Locht and Momigny, 1970
Locht, R.; Momigny, J., Mass Spectrometric Determination of the Electron Affinities of Radicals, Chem. Phys. Lett., 1970, 6, 4, 273, https://doi.org/10.1016/0009-2614(70)85072-2 . [all data]

Trepka and Neuert, 1963
Trepka, L.v.; Neuert, H., Uber die Entstehenung von Negativen Ionen aus einigen Kohlenwasserstoffen und Alkoholen durch Elektronenstoss, Z. Naturfor., 1963, 18A, 1295. [all data]

Thynne and MacNiel, 1971
Thynne, J.C.J.; MacNiel, K.A.G., Negative ion formation by ethylene and 1,1-difluoroethylene, J. Phys. Chem., 1971, 75, 2584. [all data]

Honig, 1954
Honig, R.E., Mass spectrometric study of the molecular sublimation of graphite, J. Chem. Phys., 1954, 22, 126. [all data]

Reid, Ballantine, et al., 1995
Reid, C.J.; Ballantine, J.A.; Andrews, S.R.; Harris, F.M., Charge inversion of ground-state and metastable-state C2+ cations formed from electroionised C2H2 and C2N2, and a re-evaluation of the carbon dimer's ionisation energy, Chem. Phys., 1995, 190, 113. [all data]

Plessis and Marmet, 1986
Plessis, P.; Marmet, P., Electroionization study of acetylene and fragment ions, Int. J. Mass Spectrom. Ion Processes, 1986, 70, 23. [all data]

Huber and Herzberg, 1979
Huber, K.P.; Herzberg, G., Molecular Spectra and Molecular Structure. IV. Constants of Diatomic Molecules,, Van Nostrand Reinhold Co., 1979, ,1. [all data]

Gupta and Gingerich, 1979
Gupta, S.K.; Gingerich, K.A., Observation and atomization energies of the gaseous uranium carbides, UC, UC2, UC3, UC4, UC5, and UC6 by high temperature mass spectrometry, J. Chem. Phys., 1979, 71, 3072. [all data]

Cocke and Gingerich, 1974
Cocke, D.L.; Gingerich, K.A., Thermodynamic investigation of the gaseous molecules TiRh, Rh2, and Ti2Rh by mass spectrometry, J. Chem. Phys., 1974, 60, 1958. [all data]

Cocke and Gingerich, 1972
Cocke, D.L.; Gingerich, K.A., Mass spectrometric determination of the bond dissociation energies of the molecules CePd and CeC2, J. Phys. Chem., 1972, 76, 2332. [all data]

Drowart, Burns, et al., 1959
Drowart, J.; Burns, R.P.; DeMaria, G.; Inghram, M.G., Mass spectrometric study of carbon vapor, J. Chem. Phys., 1959, 31, 1131. [all data]

Field, Franklin, et al., 1957
Field, F.H.; Franklin, J.L.; Lampe, F.W., Reactions of gaseous ions. II. Acetylene, J. Am. Chem. Soc., 1957, 79, 2665. [all data]

Read and Vanerslice, 1962
Read, S.M.; Vanerslice, J.T., Potential energy curves for C2, J. Chem. Phys., 1962, 36, 2366. [all data]

Fougere and Nesbet, 1966
Fougere, P.F.; Nesbet, R.K., Electronic structure of C2, J. Chem. Phys., 1966, 44, 285. [all data]

Verhaegen, Richards, et al., 1967
Verhaegen, G.; Richards, W.G.; Moser, C.M., Low-lying valence levels of BN and C2. The ground state of BN, J. Chem. Phys., 1967, 46, 160. [all data]

Verhaegen, 1968
Verhaegen, G., Theoretical calculation of the electronic states of C2+, J. Chem. Phys., 1968, 49, 4696. [all data]

Norrish, Porter, et al., 1952
Norrish, R.G.W.; Porter, G.; Thrush, B.A., Detection of diatomic radical absorption spectra during combustion, Nature (London), 1952, 169, 582. [all data]

Messerle, 1968
Messerle, G., Anregung hoher Rotationsniveaus von C2-Banden, Z. Naturforsch. A, 1968, 23, 470. [all data]

Messerle and Krauss, 1967
Messerle, G.; Krauss, L., Die Dissoziation des C2 - Molekuls durch Rotation, Z. Naturforsch. A, 1967, 22, 2023. [all data]

Dieke and Lochte-Holtgreven, 1930
Dieke, G.H.; Lochte-Holtgreven, W., Uber einige banden des kohlenstoffmolekuls, Z. Phys., 1930, 62, 767. [all data]

Herzberg and Sutton, 1940
Herzberg, G.; Sutton, R.B., Tail bands of the deslandres-d'azambuja system of the C2 molecule, Can. J. Res. Sect. A, 1940, 18, 74. [all data]

Herzberg, 1945
Herzberg, G., Molecular spectra and molecular structure. II. Infrared and Raman spectra of polyatomic molecules, Pub. D. Van Nostrand Company, Inc., Princeton, New Jersey, 1945, 0. [all data]

Cisak, Dabrowska, et al., 1969
Cisak, H.; Dabrowska, K.; Rytel, M., The Deslandres-d'Azambuja bands of isotopic C2 molecules, Acta Phys. Pol., 1969, 36, 497. [all data]

Bugrim, Lyutyi, et al., 1965
Bugrim, E.D.; Lyutyi, A.I.; Rossikhin, V.S.; Tsikora, I.L., New bands in the Swan system of the C2 molecule, Opt. Spectrosc. Engl. Transl., 1965, 19, 292, In original 524. [all data]

Phillips and Davis, 1968
Phillips, J.G.; Davis, S.P., Berkely analyses of molecular spectra, Pub. University of California Press, Berkeley and Los Angeles, 1968, 0. [all data]

Ballik and Ramsay, 1963
Ballik, E.A.; Ramsay, D.A., An extension of the Phillips system of C2 and a survey of C2 states, Astrophys. J., 1963, 137, 84. [all data]

Freymark, 1951
Freymark, H., Uber ein neues Bandensystem des C2-Molekuls im Ultravioletten, Ann. Phys. (Neue Folge), 1951, 8, 221. [all data]

Halmann and Laulicht, 1966
Halmann, M.; Laulicht, I., Isotope effects on vibrational transition probabilities. IV. Electronic transitions of isotopic C2, CO, CN, H2, and CH molecules, Astrophys. J. Suppl. Ser., 1966, 12, 307. [all data]

Cooper and Nicholls, 1975
Cooper, D.M.; Nicholls, R.W., Measurments of the electronic transition moments of C2-band systems, J. Quant. Spectrosc. Radiat. Transfer, 1975, 15, 139. [all data]

Landsverk, 1939
Landsverk, O.G., A 1«SIGMA»-->1«SIGMA» transition of the C2 molecule, Phys. Rev., 1939, 56, 769-777. [all data]

Smith, 1969
Smith, W.H., Transition probabilities for the Swan and Mulliken C2 bands, Astrophys. J., 1969, 156, 791. [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]

Jain, 1964
Jain, D.C., Transition probability parameters of the Swan and the Fox-Herzberg band systems of the C2 molecule, J. Quant. Spectrosc. Radiat. Transfer, 1964, 4, 427. [all data]

Phillips, 1950
Phillips, J.G., On the identification of the 3670 A band of the C2 molecule, Astrophys. J., 1950, 112, 131. [all data]

Messerle and Krauss, 1967, 2
Messerle, G.; Krauss, L., Ein neues c'1«PI»g - b1«PI»u - Bandensystem des C2 - Molekuls, Z. Naturforsch. A, 1967, 22, 2015. [all data]

Kini and Savadatti, 1969
Kini, K.S.; Savadatti, M.I., Extension of the C2(A3«PI»g-X'3«PI»u) band system, J. Phys. B:, 1969, 2, 307. [all data]

Callomon and Gilby, 1963
Callomon, J.H.; Gilby, A.C., New observations on the Swan bands of C2, Can. J. Phys., 1963, 41, 995. [all data]

Phillips, 1968
Phillips, J.G., Perturbations in the Swan system of the C2 molecule, J. Mol. Spectrosc., 1968, 28, 233. [all data]

Bleekrode and Nieuwpoort, 1965
Bleekrode, R.; Nieuwpoort, W.C., Absorption and emission measurements of C2 and CH electronic bands in low-pressure oxyacetylene flames, J. Chem. Phys., 1965, 43, 3680. [all data]

Bleekrode, 1967
Bleekrode, R., Absorption and emission spectroscopy of C2, CH and OH in low-pressure oxyacetylene flames, Philips Res. Rep. Suppl., 1967, 7, 1. [all data]

Herzberg, 1946
Herzberg, G., On the high pressure bands of carbon and the formation of C2 molecules, Phys. Rev., 1946, 70, 762. [all data]

Kunz, Harteck, et al., 1967
Kunz, C.; Harteck, P.; Dondes, S., Mechanism for excitation of the C2 high-pressure bands (C + C2O --> C2(A3«PI») + CO), J. Chem. Phys., 1967, 46, 4157. [all data]

Meinel and Messerle, 1968
Meinel, H.; Messerle, G., Investigation of the fine structure of the C2 high-pressure bands, Astrophys. J., 1968, 154, 381. [all data]

Dhumwad and Narasimham, 1968
Dhumwad, R.K.; Narasimham, N.A., Isotope shift studies of the high-pressure carbon bands, Can. J. Phys., 1968, 46, 1254. [all data]

Fink and Welge, 1967
Fink, E.H.; Welge, K.H., Lifetime measurements on CH(A2«DELTA»), CH(B2«SIGMA»-), and C2(A3«PI»g) by the phase-shift method, J. Chem. Phys., 1967, 46, 4315. [all data]

Jeunehomme and Schwenker, 1965
Jeunehomme, M.; Schwenker, R.P., Focused laser-beam experiment and the oscillator strength of the Swan system, J. Chem. Phys., 1965, 42, 2406. [all data]

Fairbairn, 1966
Fairbairn, A.R., A shock-tube study of the oscillator strength of the C2 Swan bands, J. Quant. Spectrosc. Radiat. Transfer, 1966, 6, 325. [all data]

Harrington, Modica, et al., 1966
Harrington, J.A.; Modica, A.P.; Libby, D.R., Shock-tube determination of the C2(A3«PI» --> X3«PI») and CF(A2«SIGMA»+ --> X2«PI») band-system oscillator strengths, J. Chem. Phys., 1966, 44, 3380. [all data]

Sviridov, Sobolev, et al., 1966
Sviridov, A.G.; Sobolev, N.N.; Novgorodov, M.Z., Determination of the matrix elements of the dipole moments of the electronic transitions of the Swan band system of the C2 molecule. II. Absorption method, J. Quant. Spectrosc. Radiat. Transfer, 1966, 6, 337. [all data]

Arnold, 1968
Arnold, J.O., A shock tube determination of the electronic transition moment of the C2(Swan), bands, J. Quant. Spectrosc. Radiat. Transfer, 1968, 8, 1781. [all data]

Danylewych and Nicholls, 1974
Danylewych, L.L.; Nicholls, R.W., Intensity measurements on the C2 (d3«PI»g-a3«PI»u) Swan band system. I. Intercept and partial band methods, Proc. R. Soc. London A, 1974, 339, 197-212. [all data]

Ortenberg, 1964
Ortenberg, F.S., Calculation of Franck-Condon factors for the NO, C2, and CO band systems, Opt. Spectrosc. Engl. Transl., 1964, 16, 398, In original 729. [all data]

Spindler, 1965
Spindler, R.J., Franck-Condon factors based on RKR potentials with applications to radiative absorption coefficients, J. Quant. Spectrosc. Radiat. Transfer, 1965, 5, 165. [all data]

Barger and Broida, 1965
Barger, R.L.; Broida, H.P., Spectra of C2 in solidified gases at 4º and 20 ºK, J. Chem. Phys., 1965, 43, 7, 2371-2376. [all data]

Weltner and McLeod, 1966
Weltner, W., Jr.; McLeod, D., Jr., Spectroscopy of Carbon Vapor Condensed in Rare-Gas Matrices at 4°K. III, J. Chem. Phys., 1966, 45, 8, 3096, https://doi.org/10.1063/1.1728066 . [all data]

Marenin and Johnson, 1970
Marenin, I.R.; Johnson, H.R., New molecular constants for the Phillips system of C2, J. Quant. Spectrosc. Radiat. Transfer, 1970, 10, 305. [all data]

Roux, Cerny, et al., 1976
Roux, F.; Cerny, D.; d'Incan, J., Experimental oscillator strengths in the C2(A1«PI»u-X1«SIGMA»g+) Phillips band system, Astrophys. J., 1976, 204, 940. [all data]

Veseth, 1975
Veseth, L., Molecular parameters for the a3«PI»u and b3«SIGMA»g- states in C2, Can. J. Phys., 1975, 53, 299. [all data]

Ballik and Ramsay, 1963, 2
Ballik, E.A.; Ramsay, D.A., The A'3«SIGMA»g--X'3«PI»u band system of the C2 molecule, Astrophys. J., 1963, 137, 61. [all data]

Brewer, Hicks, et al., 1962
Brewer, L.; Hicks, W.T.; Krikorian, O.H., Heat of sublimation and dissociation energy of gaseous C2, J. Chem. Phys., 1962, 36, 182. [all data]

Kordis and Gingerich, 1973
Kordis, J.; Gingerich, K.A., Gaseous phosphorus compounds. IX. Mass spectrometric studies of equilibria in the carbon-phosporus system, J. Chem. Phys., 1973, 58, 5058. [all data]

Messerle and Krauss, 1967, 3
Messerle, G.; Krauss, L., Spektroskopische Bestimmung der Dissoziationsenergie des C2-Molekuls aus den 3«PI»g - Termen, Z. Naturforsch. A, 1967, 22, 1744. [all data]

Dibeler and Liston, 1967
Dibeler, V.H.; Liston, S.K., Mass-spectrometric study of photoionization. VIII.Dicyanogen and the cyanogen halides, J. Chem. Phys., 1967, 47, 4548. [all data]


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