Ethynyl radical

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Vibrational and/or electronic energy levels

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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: Marilyn E. Jacox

State:   3ps Ryd


 Energy 
 (cm-1
 Med.   Transition   λmin 
 (nm) 
 λmax 
 (nm) 
 References

To = 72100 ± 1300 gas Cool and Goodwin, 1991

State:   C


 Energy 
 (cm-1
 Med.   Transition   λmin 
 (nm) 
 λmax 
 (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   λmin 
 (nm) 
 λmax 
 (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   λmin 
 (nm) 
 λmax 
 (nm) 
 References

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

State:   A


 Energy 
 (cm-1
 Med.   Transition   λmin 
 (nm) 
 λmax 
 (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
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

Σ+ 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

Σ+ 1 CH stretch 3298.85 T gas CC Stephens, Yan, et al., 1988
1 CH stretch 3293.3 Ne IR Wu and Cheng, 2008
Π 2 Bend 371.60 gas DL PE Kanamori and Hirota, 1988
Kawaguchi, Amano, et al., 1988
Zhou, Garand, et al., 2007
Σ+ 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, 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.

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 2Σ+) 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 2Σ+) 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 2Π←X 2Σ+ 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 ν2 + ν3 band of CCH, J. Mol. Spectrosc., 1988, 131, 1, 58, https://doi.org/10.1016/0022-2852(88)90106-3 . [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]

Yan and Amano, 1993
Yan, W.-B.; Amano, T., Difference-frequency laser spectroscopy of the 3ν2+ν3 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
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: 2Π--2Σ+ 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 2Π--X 2Σ+ 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]

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]

Kanamori, Seki, et al., 1987
Kanamori, H.; Seki, K.; Hirota, E., Infrared diode laser kinetic spectroscopy of the CCH radical ν3 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
Tanskanen, H.; Khriachtchev, L.; Lundell, J.; Rasanen, M., Organo-noble-gas hydride compounds HKrCCH, HXeCCH, HXeCC, and HXeCCXeH: Formation mechanisms and effect of [sup 13]C isotope substitution on the vibrational properties, J. Chem. Phys., 2004, 121, 17, 8291, https://doi.org/10.1063/1.1799611 . [all data]

Khriachtchev, Tanskanen, et al., 2003
Khriachtchev, L.; Tanskanen, H.; Lundell, J.; Pettersson, M.; Kiljunen, H.; Rasanen, M., Fluorine-Free Organoxenon Chemistry: HXeCCH, HXeCC, and HXeCCXeH, J. Am. Chem. Soc., 2003, 125, 16, 4696, https://doi.org/10.1021/ja034485d . [all data]

Feldman, Sukhov, et al., 2003
Feldman, V.I.; Sukhov, F.F.; Orlov, A.Yu.; Tyulpina, I.V., Experimental Evidence for the Formation of HXeCCH: The First Hydrocarbon with an Inserted Rare-Gas Atom, J. Am. Chem. Soc., 2003, 125, 16, 4698, https://doi.org/10.1021/ja034585j . [all data]

Jacox, 1994
Jacox, M.E., Vibrational and electronic energy levels of polyatomic transient molecules, American Chemical Society, Washington, DC, 1994, 464. [all data]

Jacox, 1998
Jacox, M.E., Vibrational and electronic energy levels of polyatomic transient molecules: supplement A, J. Phys. Chem. Ref. Data, 1998, 27, 2, 115-393, https://doi.org/10.1063/1.556017 . [all data]

Jacox, 2003
Jacox, M.E., Vibrational and electronic energy levels of polyatomic transient molecules: supplement B, J. Phys. Chem. Ref. Data, 2003, 32, 1, 1-441, https://doi.org/10.1063/1.1497629 . [all data]

Tucker, Kutner, et al., 1974
Tucker, K.D.; Kutner, M.L.; Thaddeus, P., The ethynyl radical C2H - A new interstellar molecule, Astrophys. J., 1974, 193, L115, https://doi.org/10.1086/181646 . [all data]

Okabe, 1975
Okabe, H., J. Chem. Phys., 1975, 62, 2782. [all data]

Sastry, Helminger, et al., 1981
Sastry, K.V.L.N.; Helminger, P.; Charo, A.; Herbst, E.; De Lucia, F.C., Laboratory millimeter and submillimeter spectrum of CCH, Astrophys. J., 1981, 251, L119, https://doi.org/10.1086/183706 . [all data]

Ziurys, Saykally, et al., 1982
Ziurys, L.M.; Saykally, R.J.; Plambeck, R.L.; Erickson, N.R., Detection of the N = 3-2 transition of CCH in Orion and determination of the molecular rotational constants, Astrophys. J., 1982, 254, 94, https://doi.org/10.1086/159709 . [all data]

Gottlieb, Gottlieb, et al., 1983
Gottlieb, C.A.; Gottlieb, E.W.; Thaddeus, P., Laboratory and astronomical measurement of the millimeter wave spectrum of the ethynyl radical CCH, Astrophys. J., 1983, 264, 740, https://doi.org/10.1086/160647 . [all data]

Saito, Hikida, et al., 1984
Saito, Y.; Hikida, T.; Ichimura, T.; Mori, Y., Fluorescence of excited ethynyl radicals produced by pulsed vacuum ultraviolet photolyses of C2H2, C2D2, and C2HBr, J. Chem. Phys., 1984, 80, 1, 31, https://doi.org/10.1063/1.446448 . [all data]

Saykally, Veseth, et al., 1984
Saykally, R.J.; Veseth, L.; Evenson, K.M., Laser magnetic resonance rotational spectroscopy of 2Σ radicals: Ethynyl (CCH), J. Chem. Phys., 1984, 80, 6, 2247, https://doi.org/10.1063/1.447001 . [all data]

Suto and Lee, 1984
Suto, M.; Lee, L.C., Quantitative photoexcitation and fluorescence studies of C2H2 in vacuum ultraviolet, J. Chem. Phys., 1984, 80, 10, 4824, https://doi.org/10.1063/1.446503 . [all data]

Fournier, Kaddouri, et al., 1985
Fournier, J.; Kaddouri, A.; Berthier, G., Evidence of emission from an excited linear triplet state in the photolysis of acetylene trapped in a rigid matrix at 4.8 K, J. Phys. Chem., 1985, 89, 19, 4120, https://doi.org/10.1021/j100265a038 . [all data]

Bogey, Demuynck, et al., 1985
Bogey, M.; Demuynck, C.; Destombes, J.L., Astron. Astrophys., 1985, 144, L15. [all data]

Tiee, Sander, et al., 1985
Tiee, J.J.; Sander, R.K.; Quick, C.R., Jr.; Romero, R.J.; Estler, R., Proc. SPIE 540 (Proc. Southwest Conf. Optics), 1985, 322. [all data]

Shokoohi, Watson, et al., 1986
Shokoohi, F.; Watson, T.A.; Reisler, H.; Kong, F.; Renlund, A.M.; Wittig, C., Photolytic production of ethynyl radical (C2H): collisional quenching of A2.PI. .fwdarw. X2.SIGMA.+ infrared emission and the removal of excited C2H, J. Phys. Chem., 1986, 90, 22, 5695, https://doi.org/10.1021/j100280a044 . [all data]

Yan, Dane, et al., 1987
Yan, W.-B.; Dane, C.B.; Zeitz, D.; Hall, J.; Curl, R.F., Color center laser spectroscopy of C2H and C2D, J. Mol. Spectrosc., 1987, 123, 2, 486, https://doi.org/10.1016/0022-2852(87)90294-3 . [all data]

Vervloet and Herman, 1988
Vervloet, M.; Herman, M., Fourier transform emission spectroscopy of C2H, Chem. Phys. Lett., 1988, 144, 1, 48, https://doi.org/10.1016/0009-2614(88)87087-8 . [all data]

Kanamori and Hirota, 1988, 2
Kanamori, H.; Hirota, E., Infrared diode laser kinetic spectroscopy of the CCD radical ν3 band, J. Chem. Phys., 1988, 88, 11, 6699, https://doi.org/10.1063/1.454414 . [all data]

Brown and Evenson, 1988
Brown, J.M.; Evenson, K.M., The far-infrared laser magnetic resonance spectrum of vibrationally excited C2H, J. Mol. Spectrosc., 1988, 131, 1, 161, https://doi.org/10.1016/0022-2852(88)90115-4 . [all data]

Fletcher and Leone, 1989
Fletcher, T.R.; Leone, S.R., Photodissociation dynamics of C2H2 at 193 nm: Vibrational distributions of the CCH radical and the rotational state distribution of the A(010) state by time-resolved Fourier transform infrared emission, J. Chem. Phys., 1989, 90, 2, 871, https://doi.org/10.1063/1.456112 . [all data]

Bogey, Demuynck, et al., 1989
Bogey, M.; Demuynck, C.; Destombes, J.L., Submillimetre wave spectra of the, Mol. Phys., 1989, 66, 5, 955, https://doi.org/10.1080/00268978900100651 . [all data]

Yan, Warner, et al., 1991
Yan, W.-B.; Warner, H.E.; Amano, T., Difference-frequency laser spectroscopy of gas phase C2D in the 2800 cm-1 region, J. Chem. Phys., 1991, 94, 3, 1712, https://doi.org/10.1063/1.459943 . [all data]

Schmidt, Peric, et al., 1998
Schmidt, C.; Peric, M.; Murtz, P.; Wienkoop, M.; Havenith, M.; Urban, W., Faraday Laser Magnetic Resonance Spectroscopy of Vibrationally Excited C2D, J. Mol. Spectrosc., 1998, 190, 1, 112, https://doi.org/10.1006/jmsp.1998.7563 . [all data]

Chiang and Hsu, 2000
Chiang, W.-Y.; Hsu, Y.-C., Fluorescence lifetimes and predissociation processes in the B [sup 2]A[sup ´] state of CCH, J. Chem. Phys., 2000, 112, 17, 7394, https://doi.org/10.1063/1.481339 . [all data]

Muller, Klaus, et al., 2000
Muller, H.S.P.; Klaus, T.; Winnewisser, G., Astron. Astrophys., 2000, 357, L65. [all data]

Tarroni and Carter, 2003
Tarroni, R.; Carter, S., Theoretical calculation of vibronic levels of C[sub 2]H and C[sub 2]D to 10 000 cm[sup -1], J. Chem. Phys., 2003, 119, 24, 12878, https://doi.org/10.1063/1.1627755 . [all data]

Tarroni and Carter, 2004
Tarroni, R.; Carter, S., Theoretical calculation of absorption intensities of C, Mol. Phys., 2004, 102, 21-22, 2167, https://doi.org/10.1080/00268970410001713254 . [all data]


Notes

Go To: Top, Vibrational and/or electronic energy levels, References