Silicon dimer

• Formula: Si₂
• Molecular weight: 56.1710
• IUPAC Standard InChI: InChI=1S/Si2/c1-2 Copy

  
• IUPAC Standard InChIKey: NTQGILPNLZZOJH-UHFFFAOYSA-N Copy
• CAS Registry Number: 12597-35-2
• Chemical structure:
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• Information on this page:
  • Gas phase thermochemistry data
  • Constants of diatomic molecules
  • References
  • Notes
• Other data available:
  • Gas phase ion energetics data
• Data at other public NIST sites:
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Gas phase thermochemistry data

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

Gas Phase Heat Capacity (Shomate Equation)

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

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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

Data collected through August, 1977

Notes

References

Go To: Top, Gas phase thermochemistry 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.

Chase, 1998
Chase, M.W., Jr., NIST-JANAF Themochemical Tables, Fourth Edition, J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]

Dubois and Leclercq, 1971
Dubois, I.; Leclercq, H., Absorption spectrum of Si₂ in the visible and near-ultraviolet region, Can. J. Phys., 1971, 49, 3053. [all data]

Milligan and Jacox, 1970
Milligan, D.E.; Jacox, M.E., Infrared and ultraviolet spectra of the products of the vacuum-ultraviolet photolysis of silane isolated in an argon matrix, J. Chem. Phys., 1970, 52, 2594. [all data]

Douglas, 1955
Douglas, A.E., The spectrum of the Si₂ molecule, Can. J. Phys., 1955, 33, 801. [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]

Verma and Warsop, 1963
Verma, R.D.; Warsop, P.A., The absorption spectrum of the Si₂ molecule, Can. J. Phys., 1963, 41, 152. [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]

Verhaegen, Stafford, et al., 1964
Verhaegen, G.; Stafford, F.E.; Drowart, J., Mass spectrometric study of the systems boron-carbon and boron-carbon-silicon, J. Chem. Phys., 1964, 40, 1622. [all data]

Notes

Go To: Top, Gas phase thermochemistry data, Constants of diatomic molecules, References

• Symbols used in this document:
  

  S°gas,1 bar	Entropy of gas at standard conditions (1 bar)
  ΔfH°gas	Enthalpy of formation of gas at standard conditions

• Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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