Silicon dicarbide

Formula: C₂Si
Molecular weight: 52.1069
CAS Registry Number: 12071-27-1
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Other data available:
- Gas phase thermochemistry data
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Gas phase ion energetics data

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Data compiled as indicated in comments:
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

Electron affinity determinations

EA (eV)	Method	Reference	Comment
1.37 ± 0.10	LPES	Nakajima, Taguwa, et al., 1995	Vertical Detachment Energy: 1.54±0.06 eV; B

Ionization energy determinations

IE (eV)	Method	Reference	Comment
10.1 ± 0.5	EI	Stearns and Kohl, 1973	LLK
10.3 ± 0.5	EI	Guido and Gigli, 1973	LLK
10.2 ± 0.3	EI	Drowart, DeMaria, et al., 1958	RDSH

Vibrational and/or electronic energy levels

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Data compiled by: Marilyn E. Jacox

State: A

Energy (cm^-1)	Med.	Transition	λ_min (nm)	λ_max (nm)	References


T_o = 20065.505	gas	A-X	402	507	Kleman, 1956
					Verma and Nagaraj, 1974
					Bondybey, 1982
					Bredohl, Dubois, et al., 1988
					Butenhoff and Rohlfing, 1991
T_o = 20142	Ne	A-X	409	611	Weltner and McLeod, 1964
					Bondybey, 1982

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


a₁	1	CC stretch	1462	gas	EM AB	Kleman, 1956 Verma and Nagaraj, 1974 Bondybey, 1982
	1	CC stretch	1462	gas	LF	Bredohl, Dubois, et al., 1988 Butenhoff and Rohlfing, 1991
	1	CC stretch	1462	Ne	AB LF	Weltner and McLeod, 1964 Bondybey, 1982
	1	CC stretch	1457	Ar	AB	Shepherd and Graham, 1986
	2	CSi s-stretch	455.04	gas	LF EM	Bondybey, 1982 Bredohl, Dubois, et al., 1988 Butenhoff and Rohlfing, 1991
	2	CSi s-stretch	462	Ne	AB LF	Weltner and McLeod, 1964 Bondybey, 1982
	2	CSi s-stretch	448	Ar	AB	Shepherd and Graham, 1986
b₂	3	CSi a-stretch	487	gas	LF	Butenhoff and Rohlfing, 1991

State: X

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


a₁	1	CC stretch	1746.0 ± 2.8		gas	EM LF	Kleman, 1956 Butenhoff and Rohlfing, 1991
	1	CC stretch	1746	s	Ne	IR LF	Weltner and McLeod, 1964 Bondybey, 1982
	1	CC stretch	1741.3		Ar	IR	Shepherd and Graham, 1985 Presilla-Marquez, Graham, et al., 1990
	2	CSi s-stretch	840.6 ± 1.2		gas	EM LF	Kleman, 1956 Shepherd and Graham, 1988 Butenhoff and Rohlfing, 1991
	2	CSi s-stretch	836	m	Ne	IR LF	Weltner and McLeod, 1964 Bondybey, 1982
	2	CSi s-stretch	824.3		Ar	IR	Shepherd and Graham, 1985 Presilla-Marquez, Graham, et al., 1990
b₂	3	CSi a-stretch	196.37 ± 0.04		gas	MW LF	Gottlieb, Vrtilek, et al., 1989 Butenhoff and Rohlfing, 1991
	3	CSi a-stretch	172	H	Ne	LF	Bondybey, 1982
	3	CSi a-stretch	160.4		Ar	IR	Presilla-Marquez, Graham, et al., 1990

Additional references: Jacox, 1994, page 66; Jacox, 1998, page 170; Michalopoulos, Geusic, et al., 1984; Thaddeus, Cummins, et al., 1984; Snyder, Henkel, et al., 1985; Suenram, Lovas, et al., 1989; Coudert, 1993; Ross, Butenhoff, et al., 1994

Notes

Medium

Strong

(1/2)(2ν)

Energy separation between the v = 0 levels of the excited and electronic ground states.

References

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

Nakajima, Taguwa, et al., 1995
Nakajima, A.; Taguwa, T.; Nakao, K.; Gomei, M.; Kishi, R.; Iwata, S.; Kaya, K., Photoelectron Spectroscopy of silicon-carbon cluster Anions (SinCm-), J. Chem. Phys., 1995, 103, 6, 2050, https://doi.org/10.1063/1.469731 . [all data]

Stearns and Kohl, 1973
Stearns, C.A.; Kohl, F.J., Mass spectrometric determination of the dissociation energies of gaseous Al₂, AlSi, and AlSiO, High Temp. Sci., 1973, 5, 113. [all data]

Guido and Gigli, 1973
Guido, M.; Gigli, G., Mass spectrometric study of the CeSiC molecules, J. Chem. Phys., 1973, 59, 3437. [all data]

Drowart, DeMaria, et al., 1958
Drowart, J.; DeMaria, G.; Inghram, M.G., Thermodynamic study of SiC utilizing a mass spectrometer, J. Chem. Phys., 1958, 29, 1015. [all data]

Kleman, 1956
Kleman, B., Laboratory Excitation of the Blue-Green Bands Observed in the Spectra of N-Type Stars., Astrophys. J., 1956, 123, 162, https://doi.org/10.1086/146142 . [all data]

Verma and Nagaraj, 1974
Verma, R.D.; Nagaraj, S., Can. J. Phys., 1974, 52, 1938. [all data]

Bondybey, 1982
Bondybey, V.E., Laser vaporization of silicon carbide. Lifetime and spectroscopy of silicon carbide (SiC2), J. Phys. Chem., 1982, 86, 17, 3396, https://doi.org/10.1021/j100214a026 . [all data]

Bredohl, Dubois, et al., 1988
Bredohl, H.; Dubois, I.; Leclercq, H.; Melen, F., Rotational analysis of the 000-000 and 010-000 bands of SiC2, J. Mol. Spectrosc., 1988, 128, 2, 399, https://doi.org/10.1016/0022-2852(88)90156-7 . [all data]

Butenhoff and Rohlfing, 1991
Butenhoff, T.J.; Rohlfing, E.A., Laser-induced fluorescence spectroscopy of jet-cooled SiC2, J. Chem. Phys., 1991, 95, 1, 1, https://doi.org/10.1063/1.461476 . [all data]

Weltner and McLeod, 1964
Weltner, W., Jr.; McLeod, D., Jr., Spectroscopy of Silicon Carbide and Silicon Vapors Trapped in Neon and Argon Matrices at 4° and 20°K, J. Chem. Phys., 1964, 41, 1, 235, https://doi.org/10.1063/1.1725627 . [all data]

Shepherd and Graham, 1986
Shepherd, R.A.; Graham, W.R.M., Proc. 17th Internatl. Sympos. on Free Radicals, 1986, Natl. Bur. Stand. Special Publ. 716. [all data]

Shepherd and Graham, 1985
Shepherd, R.A.; Graham, W.R.M., FTIR matrix isolation study of carbon-13 substituted SiC2, J. Chem. Phys., 1985, 82, 11, 4788, https://doi.org/10.1063/1.448696 . [all data]

Presilla-Marquez, Graham, et al., 1990
Presilla-Marquez, J.D.; Graham, W.R.M.; Shepherd, R.A., Fourier transform far infrared spectroscopy of the ν'3 vibration of SiC2 in Ar at 10 K, J. Chem. Phys., 1990, 93, 8, 5424, https://doi.org/10.1063/1.459638 . [all data]

Shepherd and Graham, 1988
Shepherd, R.A.; Graham, W.R.M., Some implications from matrix studies for the structure and vibrational assignments of SiC2, J. Chem. Phys., 1988, 88, 5, 3399, https://doi.org/10.1063/1.453938 . [all data]

Gottlieb, Vrtilek, et al., 1989
Gottlieb, C.A.; Vrtilek, J.M.; Thaddeus, P., Laboratory Measurement of the Rotational Spectrum of SiCC, Astrophys. J., 1989, 343, L29, https://doi.org/10.1086/185503 . [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]

Michalopoulos, Geusic, et al., 1984
Michalopoulos, D.L.; Geusic, M.E.; Langridge-Smith, P.R.R.; Smalley, R.E., Visible spectroscopy of jet-cooled SiC2: Geometry and electronic structure, J. Chem. Phys., 1984, 80, 8, 3556, https://doi.org/10.1063/1.447201 . [all data]

Thaddeus, Cummins, et al., 1984
Thaddeus, P.; Cummins, S.E.; Linke, R.A., Identification of the SiCC radical toward IC +10216 - The first molecular ring in an astronomical source, Astrophys. J., 1984, 283, L45, https://doi.org/10.1086/184330 . [all data]

Snyder, Henkel, et al., 1985
Snyder, L.E.; Henkel, C.; Hollis, J.M.; Lovas, F.J., Observations of the SiC2 radical toward IRC + 10216 at 1.27 centimeters, Astrophys. J., 1985, 290, L29, https://doi.org/10.1086/184436 . [all data]

Suenram, Lovas, et al., 1989
Suenram, R.D.; Lovas, F.J.; Matsumura, K., Laboratory measurement of the 1(01)-0(00) transition and electric dipole moment of SiC2, Astrophys. J., 1989, 342, L103, https://doi.org/10.1086/185495 . [all data]

Coudert, 1993
Coudert, L.H., Analysis of the Rotational Levels of SiC2, J. Mol. Spectrosc., 1993, 160, 1, 225, https://doi.org/10.1006/jmsp.1993.1170 . [all data]

Ross, Butenhoff, et al., 1994
Ross, S.C.; Butenhoff, T.J.; Rohlfing, E.A.; Rohlfing, C.M., SiC2: A molecular pinwheel, J. Chem. Phys., 1994, 100, 6, 4110, https://doi.org/10.1063/1.466348 . [all data]

Notes

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

Symbols used in this document:

EA Electron affinity
Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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