Silicon dimer


Gas phase thermochemistry data

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.

Quantity Value Units Method Reference Comment
Δfgas141.00kcal/molReviewChase, 1998Data last reviewed in March, 1967
Quantity Value Units Method Reference Comment
gas,1 bar54.924cal/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 (cal/mol*K)
    H° = standard enthalpy (kcal/mol)
    S° = standard entropy (cal/mol*K)
    t = temperature (K) / 1000.

View plot Requires a JavaScript / HTML 5 canvas capable browser.

View table.

Temperature (K) 298. to 1100.1100. to 6000.
A 5.78391111.45460
B 7.548471-1.038701
C -1.9747400.247912
D -0.926286-0.017322
E 0.035998-0.049805
F 139.0810136.6430
G 59.9708967.09510
H 141.0000141.0000
ReferenceChase, 1998Chase, 1998
Comment Data last reviewed in March, 1967 Data last reviewed in March, 1967

Gas phase ion energetics data

Go To: Top, Gas phase thermochemistry 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 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
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
B - John E. Bartmess

View reactions leading to Si2+ (ion structure unspecified)

Electron affinity determinations

EA (eV) Method Reference Comment
2.230 ± 0.010N/APeppernick, Gunaratne, et al., 2010Stated electron affinity is the Vertical Detachment Energy; B
2.202 ± 0.010LPESArnold, Kitsopoulos, et al., 1993B
2.199 ± 0.012LPESNimlos, Harding, et al., 1987B
<2.60011IMRBMandich, Bondybey, et al., 1987The values from this reference are ca. 0.4-0.8 eV more bound than from other references; B

Ionization energy determinations

IE (eV) Method Reference Comment
7.9LSWinstead, Paukstis, et al., 1995LL
≤8.04 ± 0.13DERBoo and Armentrout, 1987LBLHLM
7.3EIVerhaegen, Stafford, et al., 1964RDSH
7.4 ± 0.3EIDrowart, DeMaria, et al., 1958RDSH

References

Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, 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]

Peppernick, Gunaratne, et al., 2010
Peppernick, S.J.; Gunaratne, K.D.D.; Sayres, S.G.; Castleman, A.W., Photoelectron imaging of small silicon cluster anions, Si-n- (n=2-7), J. Chem. Phys., 2010, 132, 4, 044302, https://doi.org/10.1063/1.3299271 . [all data]

Arnold, Kitsopoulos, et al., 1993
Arnold, C.C.; Kitsopoulos, T.N.; Neumark, D.M., Reassignment of the Si2(-) Photodetachment Spectra, J. Chem. Phys., 1993, 99, 1, 766, https://doi.org/10.1063/1.465757 . [all data]

Nimlos, Harding, et al., 1987
Nimlos, M.R.; Harding, L.B.; Ellison, G.B., The Electronic States of Si2 and Si2- as Revealed by Photoelectron Spectroscopy, J. Chem. Phys., 1987, 87, 9, 5116, https://doi.org/10.1063/1.453679 . [all data]

Mandich, Bondybey, et al., 1987
Mandich, M.L.; Bondybey, V.E.; Reents, W.D., Reactive Etching of Positive and Negative Silicon Cluster Ions by Nitrogen Dioxide, J. Chem. Phys., 1987, 86, 7, 4245, https://doi.org/10.1063/1.451885 . [all data]

Winstead, Paukstis, et al., 1995
Winstead, C.B.; Paukstis, S.J.; Walters, J.L.; Gole, J.L., Multiphoton ionization of Ag2: Assessment of a new excited electronic state and resolution of the Ag2 ionization potential, J. Chem. Phys., 1995, 102, 1877. [all data]

Boo and Armentrout, 1987
Boo, B.H.; Armentrout, P.B., Reaction of silicon ion (2P) with silane (SiH4, SiD4) heats of formation of SiHn, SiHn+ (n=1,2,3), and Si2Hn+ (n=0,1,2,3) remarkable isotope exchange reaction involving four hydrogen shifts, J. Am. Chem. Soc., 1987, 109, 3549. [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]

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]


Notes

Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics data, References