Silicon timer
- Formula: Si3
- Molecular weight: 84.2565
- IUPAC Standard InChI: InChI=1S/Si3/c1-2-3-1
- IUPAC Standard InChIKey: VJNZTIUQOVUHQB-UHFFFAOYSA-N
- CAS Registry Number: 12597-37-4
- Chemical structure:
This structure is also available as a 2d Mol file or as a computed 3d SD file
The 3d structure may be viewed using Java or Javascript. - Other names: Silicon
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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 |
|---|---|---|---|---|---|
| ΔfH°gas | 635.97 | kJ/mol | Review | Chase, 1998 | Data last reviewed in March, 1967 |
| Quantity | Value | Units | Method | Reference | Comment |
| S°gas,1 bar | 267.87 | J/mol*K | Review | Chase, 1998 | Data 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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| Temperature (K) | 298. to 6000. |
|---|---|
| A | 62.88678 |
| B | -2.292034 |
| C | 1.518324 |
| D | -0.155889 |
| E | -0.664449 |
| F | 615.0815 |
| G | 340.8504 |
| H | 635.9680 |
| Reference | Chase, 1998 |
| Comment | 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:
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 |
|---|---|---|---|
| 2.400 ± 0.030 | N/A | Peppernick, Gunaratne, et al., 2010 | Stated electron affinity is the Vertical Detachment Energy; B |
| 2.30177 ± 0.00087 | ZEKE | Arnold and Neumark, 1994 | B |
| 2.33 | LPES | Kitsopoulos, Chick, et al., 1990 | B |
| 2.00 ± 0.20 | LPES | Cheshnovsky, Yang, et al., 1987 | EA given is Vertical Detachment Energy. Adiabatic EA est as up to 1 eV smaller; B |
| <2.60011 | IMRB | Mandich, Bondybey, et al., 1987 | The 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 |
|---|---|---|---|
| 8.0 ± 0.3 | EI | Drowart, DeMaria, et al., 1958 | RDSH |
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 and Neumark, 1994
Arnold, C.C.; Neumark, D.M.,
Threshold Photodetachment Zero-Electron Kinetic Energy Spectroscopy of Si-3(-),
J. Chem. Phys., 1994, 100, 3, 1797, https://doi.org/10.1063/1.466532
. [all data]
Kitsopoulos, Chick, et al., 1990
Kitsopoulos, T.N.; Chick, C.J.; Weaver, A.; Neumark, D.M.,
Vibrationally Resolved Photoelectron Spectra of Si-3- and Si-4-,
J. Chem. Phys., 1990, 93, 8, 6108, https://doi.org/10.1063/1.459004
. [all data]
Cheshnovsky, Yang, et al., 1987
Cheshnovsky, O.; Yang, S.H.; Pettiette, C.L.; Craycraft, M.J.; Liu, Y.; Smalley, R.E.,
Ultraviolet Photoelectron Spectroscopy of Semiconductor Clusters: Silicon and Germanium,
Chem. Phys. Lett., 1987, 138, 2-3, 119, https://doi.org/10.1016/0009-2614(87)80353-6
. [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]
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
- Symbols used in this document:
EA Electron affinity 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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