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Ethynyl radical

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Gas phase thermochemistry data

Go To: Top, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, Vibrational and/or electronic energy levels, References, Notes

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

Quantity Value Units Method Reference Comment
Deltafgas476.98kJ/molReviewChase, 1998Data last reviewed in March, 1967
Deltafgas556. ± 8.kJ/molN/ATsang, 1996 
Quantity Value Units Method Reference Comment
gas,1 bar207.44J/mol*KReviewChase, 1998Data last reviewed in March, 1967

Gas Phase Heat Capacity (Shomate Equation)

Cp° = 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
    Cp = heat capacity (J/mol*K)
    H° = standard enthalpy (kJ/mol)
    S° = standard entropy (J/mol*K)
    t = temperature (K) / 1000.

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View table.

Temperature (K) 298. - 1200.1200. - 6000.
A 33.4091639.29220
B 24.1133113.32081
C -6.600595-1.952364
D 0.2789120.086290
E -0.2594590.978203
F 465.1311464.3027
G 239.5148248.5949
H 476.9760476.9760
ReferenceChase, 1998Chase, 1998
Comment Data last reviewed in March, 1967 Data last reviewed in March, 1967

Reaction thermochemistry data

Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, Ion clustering data, Vibrational and/or electronic energy levels, 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

(C2H2- bullet 4294967295Ethynyl radical) + Ethynyl radical = C2H2-

By formula: (C2H2- bullet 4294967295C2H) + C2H = C2H2-

Quantity Value Units Method Reference Comment
Deltar328. ± 15.kJ/molN/AErvin, Gronert, et al., 1990gas phase; Vinylidene neutral: «DELTA»Hf<=99±2 kcal, Kiefer, Sidhu, et al., 1989
Deltar187. ± 14.kJ/molTherGuo and Grabowski, 1990gas phase; Between PhF, Me3P

Gas phase ion energetics data

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Ion clustering data, Vibrational and/or electronic energy levels, 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
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi

View reactions leading to C2H+ (ion structure unspecified)

Quantity Value Units Method Reference Comment
IE (evaluated)11.61 ± 0.07eVN/AN/AL
Quantity Value Units Method Reference Comment
Proton affinity (review)753.kJ/molN/AHunter and Lias, 1998HL
Quantity Value Units Method Reference Comment
Gas basicity720.8kJ/molN/AHunter and Lias, 1998HL

Electron affinity determinations

EA (eV) Method Reference Comment
2.9689 ± 0.0011N/AZhou, Garand, et al., 2007B
2.9690 ± 0.0060LPESErvin and Lineberger, 1991B
2.956 ± 0.020LPESTaylor, Xu, et al., 1998B
2.94 ± 0.10LPDJanousek, Brauman, et al., 1979Adiabatic EA: 3.18±0.25 eV; B
>2.30 ± 0.70EIAEThynne and MacNiel, 1971From C2H4; B
3.730 ± 0.050PDFeldman, 1970B
2.10 ± 0.30EIAELocht and Momigny, 1970From C2H2, C2H4; B
>2.79998EIAETrepka and Neuert, 1963From C2H4; B
2.64955SIPage and Goode, 1969The Magnetron method, lacking mass analysis, is not considered reliable.; B

Ionization energy determinations

IE (eV) Method Reference Comment
11.61 ± 0.07DERNorwood and Ng, 1989LL
11.7DERLias, Bartmess, et al., 1988LL
11.31 ± 0.13DEROno and Ng, 1981LLK
11.51DEROno and Ng, 1981Unpublished result of S.I.Miller and J.Berkowitz; LLK
11.96 ± 0.05DEROkabe and Dibeler, 1973LLK
11.96 ± 0.05DERDibeler, Walker, et al., 1973LLK
11.6 ± 0.5EIWyatt and Stafford, 1972LLK

Anion protonation reactions

C2H- + Hydrogen cation = Acetylene

By formula: C2H- + H+ = C2H2

Quantity Value Units Method Reference Comment
Deltar1580. ± 20.kJ/molAVGN/AAverage of 8 values; Individual data points
Quantity Value Units Method Reference Comment
Deltar1550. ± 20.kJ/molAVGN/AAverage of 7 values; Individual data points

Ion clustering data

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, Vibrational and/or electronic energy levels, 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

(C2H2- bullet 4294967295Ethynyl radical) + Ethynyl radical = C2H2-

By formula: (C2H2- bullet 4294967295C2H) + C2H = C2H2-

Quantity Value Units Method Reference Comment
Deltar328. ± 15.kJ/molN/AErvin, Gronert, et al., 1990gas phase; Vinylidene neutral: «DELTA»Hf<=99±2 kcal, Kiefer, Sidhu, et al., 1989
Deltar187. ± 14.kJ/molTherGuo and Grabowski, 1990gas phase; Between PhF, Me3P

Vibrational and/or electronic energy levels

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: Marilyn E. Jacox

State:   3ps Ryd


 Energy 
 (cm-1
 Med.   Transition   «lambda»min 
 (nm) 
 «lambda»max 
 (nm) 
 References

To = 72100 ± 1300 gas Cool and Goodwin, 1991

State:   C


 Energy 
 (cm-1
 Med.   Transition   «lambda»min 
 (nm) 
 «lambda»max 
 (nm) 
 References

To = 51387 ± 25 T Ar 160 195 Chang and Graham, 1982


Vib. 
sym. 
 No.   Approximate 
 type of mode 
 cm-1   Med.   Method   References

CC stretch 2175 ± 25 Ar AB Chang and Graham, 1982
Bend 630 ± 25 Ar AB Chang and Graham, 1982

State:   B


 Energy 
 (cm-1
 Med.   Transition   «lambda»min 
 (nm) 
 «lambda»max 
 (nm) 
 References

To = 39157.4 U gas B-X 235 313 Hsu, Wang, et al., 1992
Hsu, Lin, et al., 1993
Some, Remy, et al., 1995
Hsu, Shiu, et al., 1995
Chiang and Hsu, 1999
Fahr, 2003

State:   B'


 Energy 
 (cm-1
 Med.   Transition   «lambda»min 
 (nm) 
 «lambda»max 
 (nm) 
 References

To = 29360 T U Ar Graham, Dismuke, et al., 1974
Chang and Graham, 1982

State:   A


 Energy 
 (cm-1
 Med.   Transition   «lambda»min 
 (nm) 
 «lambda»max 
 (nm) 
 References

To = 3692.61 gas Carrick, Merer, et al., 1983
Curl, Carrick, et al., 1985
Yan, Hall, et al., 1987
Kanamori and Hirota, 1988
Kawaguchi, Amano, et al., 1988
Ervin and Lineberger, 1991
Yan and Amano, 1993
Hsu, Shiu, et al., 1995
Pfelzer, Havenith, et al., 1996
Hsu, Chen, et al., 1996
Taylor, Xu, et al., 1998, 2
Chiang and Hsu, 1999
Boye, Campos, et al., 2002
Sharp-Williams, Roberts, et al., 2011
To = 3685.8 Ne A-X 1100 2715 Forney, Jacox, et al., 1995
To = 3732 Ar Jacox and Olson, 1987
Forney, Jacox, et al., 1995


Vib. 
sym. 
 No.   Approximate 
 type of mode 
 cm-1   Med.   Method   References

Sigma+ 3 CC stretch 1706.2 T Ne AB Forney, Jacox, et al., 1995

State:   X


Vib. 
sym. 
 No.   Approximate 
 type of mode 
 cm-1   Med.   Method   References

Sigma+ 1 CH stretch 3298.85 T gas CC Stephens, Yan, et al., 1988
1 CH stretch 3293.3 Ne IR Wu and Cheng, 2008
Pi 2 Bend 371.60 gas DL PE Kanamori and Hirota, 1988
Kawaguchi, Amano, et al., 1988
Zhou, Garand, et al., 2007
Sigma+ 3 CC stretch 1840.57 gas DL Kanamori, Seki, et al., 1987
3 CC stretch 1835.5 Ne IR Forney, Jacox, et al., 1995
Andrews, Kushto, et al., 1999
Wu and Cheng, 2008
3 CC stretch 1846.2 m Ar IR Milligan, Jacox, et al., 1967
Jacox, 1975
Shepherd and Graham, 1987
Jacox and Olson, 1987
Andrews, Kushto, et al., 1999
3 CC stretch 1842 Kr IR Tanskanen, Khriachtchev, et al., 2004
3 CC stretch 1852 Xe IR Khriachtchev, Tanskanen, et al., 2003
Feldman, Sukhov, et al., 2003

Additional references: Jacox, 1994, page 32; Jacox, 1998, page 142; Jacox, 2003, page 28; Tucker, Kutner, et al., 1974; Okabe, 1975; Sastry, Helminger, et al., 1981; Ziurys, Saykally, et al., 1982; Gottlieb, Gottlieb, et al., 1983; Saito, Hikida, et al., 1984; Saykally, Veseth, et al., 1984; Suto and Lee, 1984; Fournier, Kaddouri, et al., 1985; Bogey, Demuynck, et al., 1985; Tiee, Sander, et al., 1985; Shokoohi, Watson, et al., 1986; Yan, Dane, et al., 1987; Vervloet and Herman, 1988; Kanamori and Hirota, 1988, 2; Brown and Evenson, 1988; Fletcher and Leone, 1989; Bogey, Demuynck, et al., 1989; Yan, Warner, et al., 1991; Schmidt, Peric, et al., 1998; Chiang and Hsu, 2000; Muller, Klaus, et al., 2000; Tarroni and Carter, 2003; Tarroni and Carter, 2004

Notes

mMedium
UUpper bound
TTentative assignment or approximate value
oEnergy separation between the v = 0 levels of the excited and electronic ground states.

References

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, Vibrational and/or electronic energy levels, 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]

Tsang, 1996
Tsang, W., Heats of Formation of Organic Free Radicals by Kinetic Methods in Energetics of Organic Free Radicals, Martinho Simoes, J.A.; Greenberg, A.; Liebman, J.F., eds., Blackie Academic and Professional, London, 1996, 22-58. [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]

Kiefer, Sidhu, et al., 1989
Kiefer, J.H.; Sidhu, S.S.; Kumaran, S.S.; Irdan, E.A., RRKM Model of C2H4 Dissociation: Heat of Formation of Vinylidene, Chem. Phys. Lett., 1989, 159, 1, 32, https://doi.org/10.1016/S0009-2614(89)87448-2 . [all data]

Guo and Grabowski, 1990
Guo, Y.; Grabowski, J.J., Gas Phase Ion Chemistry of the Vinylidene Radical Anion and the Acidity of the Vinyl Radical, Int. J. Mass Spectrom. Ion Proc., 1990, 97, 3, 253, https://doi.org/10.1016/0168-1176(90)85003-K . [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]

Zhou, Garand, et al., 2007
Zhou, J.; Garand, E.; Neumark, D.M., Vibronic structure in C2H and C2D from anion slow electron velocity-map imaging spectroscopy, J. Chem. Phys., 2007, 127, 11, 114313, https://doi.org/10.1063/1.2768932 . [all data]

Ervin and Lineberger, 1991
Ervin, K.M.; Lineberger, W.C., Photoelectron Spectra of C2- and C2H-, J. Phys. Chem., 1991, 95, 3, 1167, https://doi.org/10.1021/j100156a026 . [all data]

Taylor, Xu, et al., 1998
Taylor, T.R.; Xu, C.S.; Neumark, D.M., Photoelectron spectra of the C2nH- (n=1-4) and C2nD- (n=1-3) anions, J. Chem. Phys., 1998, 108, 24, 10018-10026, https://doi.org/10.1063/1.476462 . [all data]

Janousek, Brauman, et al., 1979
Janousek, B.K.; Brauman, J.I.; Simons, J., An experimental and theoretical determination of the electron affinity of the enhynyl radical HC2, J. Chem. Phys., 1979, 71, 2057. [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]

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]

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

Norwood and Ng, 1989
Norwood, K.; Ng, C.Y., A state-selected study of the unimolecular decompoisition of C2H2+(A,B) using the photoion photoelectron coincidence method, J. Chem. Phys., 1989, 91, 2898. [all data]

Lias, Bartmess, et al., 1988
Lias, S.G.; Bartmess, J.E.; Liebman, J.F.; Holmes, J.L.; Levin, R.D.; Mallard, W.G., Gas-phase ion and neutral thermochemistry, J. Phys. Chem. Ref. Data, Suppl. 1, 1988, 17, 1-861. [all data]

Ono and Ng, 1981
Ono, Y.; Ng, C.Y., The heat of formation of C2H+, J. Chem. Phys., 1981, 74, 6985. [all data]

Okabe and Dibeler, 1973
Okabe, H.; Dibeler, V.H., Photon impact studies of C2HCN and CH3CN in the vacuum ultraviolet; heats of formation of C2H and CH3CN, J. Chem. Phys., 1973, 59, 2430. [all data]

Dibeler, Walker, et al., 1973
Dibeler, V.H.; Walker, J.A.; McCulloh, K.E., Observations on hot bands in the molecular and dissociative photoionization of acetylene and the heat of formation of the ethynyl ion, J. Chem. Phys., 1973, 59, 2264. [all data]

Wyatt and Stafford, 1972
Wyatt, J.R.; Stafford, F.E., Mass spectrometric determination of the heat of formation of ethynyl radical, C2H, and of some related species, J. Phys. Chem., 1972, 76, 1913. [all data]

Cool and Goodwin, 1991
Cool, T.A.; Goodwin, P.M., Observation of an electronic state of C2H near 9 eV by resonance ionization spectroscopy, J. Chem. Phys., 1991, 94, 11, 6978, https://doi.org/10.1063/1.460231 . [all data]

Chang and Graham, 1982
Chang, K.W.; Graham, W.R.M., Vacuum UV spectra of photolyzed C2H2 in solid Ar at 8 K, J. Chem. Phys., 1982, 76, 11, 5238, https://doi.org/10.1063/1.442919 . [all data]

Hsu, Wang, et al., 1992
Hsu, Y.-C.; Wang, P.-R.; Yang, M.-C.; Papousek, D.; Chen, Y.-T.; Chiang, W.-Y., Ultraviolet laser-induced fluorescence of the C2H radical, Chem. Phys. Lett., 1992, 190, 5, 507, https://doi.org/10.1016/0009-2614(92)85182-A . [all data]

Hsu, Lin, et al., 1993
Hsu, Y.-C.; Lin, J.J.-M.; Papousek, D.; Tsai, J.-J., The low-lying bending vibrational levels of the CCH (X 2«SIGMA»+) radical studied by laser-induced fluorescence, J. Chem. Phys., 1993, 98, 9, 6690, https://doi.org/10.1063/1.464761 . [all data]

Some, Remy, et al., 1995
Some, E.; Remy, F.; Macau-Hercot, D.; Dubois, I.; Breton, J.; Bredohl, H., The Near UV Emission Spectrum of C2H, J. Mol. Spectrosc., 1995, 173, 1, 44, https://doi.org/10.1006/jmsp.1995.1216 . [all data]

Hsu, Shiu, et al., 1995
Hsu, Y.-C.; Shiu, Y.-J.; Lin, C.-M., Laser-induced fluorescence spectroscopy of CCH (X 2«SIGMA»+) in vibrationally excited levels up to 4500 cm-1, J. Chem. Phys., 1995, 103, 14, 5919, https://doi.org/10.1063/1.470472 . [all data]

Chiang and Hsu, 1999
Chiang, W.-Y.; Hsu, Y.-C., Laser spectroscopy of CCH in the 36 600--39 700 cm[sup -1] region, J. Chem. Phys., 1999, 111, 4, 1454, https://doi.org/10.1063/1.479389 . [all data]

Fahr, 2003
Fahr, A., Ultraviolet absorption spectrum and cross-sections of ethynyl (C2H) radicals, J. Mol. Spectrosc., 2003, 217, 2, 249, https://doi.org/10.1016/S0022-2852(02)00039-5 . [all data]

Graham, Dismuke, et al., 1974
Graham, W.R.M.; Dismuke, K.I.; Weltner, W., Jr., C2H radical: 13C hyperfine interaction and optical spectrum, J. Chem. Phys., 1974, 60, 10, 3817, https://doi.org/10.1063/1.1680824 . [all data]

Carrick, Merer, et al., 1983
Carrick, P.G.; Merer, A.J.; Curl, R.F., A 2«PI»<--X 2«SIGMA»+ infrared electronic transition of C2Ha), J. Chem. Phys., 1983, 78, 6, 3652, https://doi.org/10.1063/1.445112 . [all data]

Curl, Carrick, et al., 1985
Curl, R.F.; Carrick, P.G.; Merer, A.J., Rotational analysis of the A <-- X system of C2Ha), J. Chem. Phys., 1985, 82, 8, 3479, https://doi.org/10.1063/1.448927 . [all data]

Yan, Hall, et al., 1987
Yan, W.-B.; Hall, J.L.; Stephens, J.W.; Richnow, M.L.; Curl, R.F., Color center laser spectroscopy of vibrationally excited C2H, J. Chem. Phys., 1987, 86, 4, 1657, https://doi.org/10.1063/1.452163 . [all data]

Kanamori and Hirota, 1988
Kanamori, H.; Hirota, E., Vibronic bands of the CCH radical observed by infrared diode laser kinetic spectroscopy, J. Chem. Phys., 1988, 89, 7, 3962, https://doi.org/10.1063/1.454877 . [all data]

Kawaguchi, Amano, et al., 1988
Kawaguchi, K.; Amano, T.; Hirota, E., Infrared diode laser spectroscopy of the «nu»2 + «nu»3 band of CCH, J. Mol. Spectrosc., 1988, 131, 1, 58, https://doi.org/10.1016/0022-2852(88)90106-3 . [all data]

Yan and Amano, 1993
Yan, W.-B.; Amano, T., Difference-frequency laser spectroscopy of the 3«nu»2+«nu»3 band of C2H, J. Chem. Phys., 1993, 99, 6, 4312, https://doi.org/10.1063/1.466084 . [all data]

Pfelzer, Havenith, et al., 1996
Pfelzer, C.; Havenith, M.; Peric, M.; Murtz, P.; Urban, W., Faraday Laser Magnetic Resonance Spectroscopy of Vibrationally Excited C2H, J. Mol. Spectrosc., 1996, 176, 1, 28, https://doi.org/10.1006/jmsp.1996.0058 . [all data]

Hsu, Chen, et al., 1996
Hsu, Y.-C.; Chen, F.-T.; Chou, L.-C.; Shiu, Y.-J., 193.3 nm photodissociation of acetylene: Nascent state distribution of CCH radical studied by laser-induced fluorescence, J. Chem. Phys., 1996, 105, 20, 9153, https://doi.org/10.1063/1.472763 . [all data]

Taylor, Xu, et al., 1998, 2
Taylor, T.R.; Xu, C.; Neumark, D.M., Photoelectron spectra of the C[sub 2n]H[sup -] (n=1--4) and C[sub 2n]D[sup -] (n=1--3) anions, J. Chem. Phys., 1998, 108, 24, 10018, https://doi.org/10.1063/1.476462 . [all data]

Boye, Campos, et al., 2002
Boye, S.; Campos, A.; Douin, S.; Fellows, C.; Gauyacq, D.; Shafizadeh, N.; Halvick, Ph.; Boggio-Pasqua, M., Visible emission from the vibrationally hot C[sub 2]H radical following vacuum-ultraviolet photolysis of acetylene: Experiment and theory, J. Chem. Phys., 2002, 116, 20, 8843, https://doi.org/10.1063/1.1471239 . [all data]

Sharp-Williams, Roberts, et al., 2011
Sharp-Williams, E.N.; Roberts, M.A.; Nesbitt, D.J., High resolution slit-jet infrared spectroscopy of ethynyl radical: 2«PI»--2«SIGMA»+ vibronic bands with sub-Doppler resolution, J. Chem. Phys., 2011, 134, 6, 064314, https://doi.org/10.1063/1.3532088 . [all data]

Forney, Jacox, et al., 1995
Forney, D.; Jacox, M.E.; Thompson, W.E., The Infrared and Near-Infrared Spectra of HCC and DCC Trapped in Solid Neon, J. Mol. Spectrosc., 1995, 170, 1, 178, https://doi.org/10.1006/jmsp.1995.1065 . [all data]

Jacox and Olson, 1987
Jacox, M.E.; Olson, W.B., The A 2«PI»--X 2«SIGMA»+ transition of HC2 isolated in solid argon, J. Chem. Phys., 1987, 86, 6, 3134, https://doi.org/10.1063/1.452024 . [all data]

Stephens, Yan, et al., 1988
Stephens, J.W.; Yan, W.-B.; Richnow, M.L.; Solka, H.; Curl, R.F., Infrared kinetic spectroscopy of C2H and C2D, J. Mol. Struct., 1988, 190, 41, https://doi.org/10.1016/0022-2860(88)80269-2 . [all data]

Wu and Cheng, 2008
Wu, Y.-J.; Cheng, B.-M., Infrared absorption spectra of ethynyl radicals isolated in solid Ne: Identification of the fundamental C--H stretching mode, Chem. Phys. Lett., 2008, 461, 1-3, 53, https://doi.org/10.1016/j.cplett.2008.07.008 . [all data]

Kanamori, Seki, et al., 1987
Kanamori, H.; Seki, K.; Hirota, E., Infrared diode laser kinetic spectroscopy of the CCH radical «nu»3 band, J. Chem. Phys., 1987, 87, 1, 73, https://doi.org/10.1063/1.453571 . [all data]

Andrews, Kushto, et al., 1999
Andrews, L.; Kushto, G.P.; Zhou, M.; Willson, S.P.; Souter, P.F., Infrared spectrum of CCH[sup +] in solid argon and neon, J. Chem. Phys., 1999, 110, 9, 4457, https://doi.org/10.1063/1.478329 . [all data]

Milligan, Jacox, et al., 1967
Milligan, D.E.; Jacox, M.E.; Abouaf-Marguin, L., Vacuum-Ultraviolet Photolysis of Acetylene in Inert Matrices. Spectroscopic Study of the Species C2, J. Chem. Phys., 1967, 46, 12, 4562, https://doi.org/10.1063/1.1840602 . [all data]

Jacox, 1975
Jacox, M.E., Matrix isolation study of the vibrational spectrum and structure of HC2, Chem. Phys., 1975, 7, 3, 424, https://doi.org/10.1016/0301-0104(75)87025-X . [all data]

Shepherd and Graham, 1987
Shepherd, R.A.; Graham, W.R.M., FTIR study of D and 13C substituted C2H in solid argon, J. Chem. Phys., 1987, 86, 5, 2600, https://doi.org/10.1063/1.452062 . [all data]

Tanskanen, Khriachtchev, et al., 2004
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Khriachtchev, Tanskanen, et al., 2003
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Notes

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