silicon
- Formula: Si
- Molecular weight: 28.0855
- IUPAC Standard InChIKey: XUIMIQQOPSSXEZ-UHFFFAOYSA-N
- CAS Registry Number: 7440-21-3
- Chemical structure:
This structure is also available as a 2d Mol file - Permanent link for this species. Use this link for bookmarking this species for future reference.
- Information on this page:
- Data at other public NIST sites:
- NIST Atomic Spectra Database - Lines Holdings (on physics web site)
- NIST Atomic Spectra Database - Levels Holdings (on physics web site)
- NIST Atomic Spectra Database - Ground states and ionization energies (on physics web site)
- Computational Chemistry Comparison and Benchmark Database
- Gas Phase Kinetics Database
- X-ray Photoelectron Spectroscopy Database, version 5.0
- Options:
Gas phase thermochemistry data
Go To: Top, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering 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 | 450. ± 8. | kJ/mol | Review | Cox, Wagman, et al., 1984 | CODATA Review value |
ΔfH°gas | 450.00 | kJ/mol | Review | Chase, 1998 | Data last reviewed in March, 1967 |
Quantity | Value | Units | Method | Reference | Comment |
S°gas,1 bar | 167.981 ± 0.004 | J/mol*K | Review | Cox, Wagman, et al., 1984 | CODATA Review value |
S°gas,1 bar | 167.98 | 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.
View plot Requires a JavaScript / HTML 5 canvas capable browser.
Temperature (K) | 3504.616 to 6000. |
---|---|
A | 14.59321 |
B | 5.224644 |
C | -1.078879 |
D | 0.074000 |
E | 2.309405 |
F | 450.3365 |
G | 190.2494 |
H | 450.0018 |
Reference | Chase, 1998 |
Comment | Data last reviewed in March, 1967 |
Condensed 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.
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔfH°liquid | 48.47 | kJ/mol | Review | Chase, 1998 | Data last reviewed in March, 1967 |
Quantity | Value | Units | Method | Reference | Comment |
S°liquid,1 bar | 44.46 | J/mol*K | Review | Chase, 1998 | Data last reviewed in March, 1967 |
Quantity | Value | Units | Method | Reference | Comment |
S°solid,1 bar | 18.81 ± 0.08 | J/mol*K | Review | Cox, Wagman, et al., 1984 | CODATA Review value |
Quantity | Value | Units | Method | Reference | Comment |
S°solid | 18.82 | J/mol*K | Review | Chase, 1998 | Data last reviewed in March, 1967 |
Liquid 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.
View plot Requires a JavaScript / HTML 5 canvas capable browser.
Temperature (K) | 1685. to 3504.616 |
---|---|
A | 27.19604 |
B | -1.198306×10-10 |
C | 5.353262×10-11 |
D | -6.956612×10-12 |
E | -4.294375×10-12 |
F | 40.36163 |
G | 77.37178 |
H | 48.46997 |
Reference | Chase, 1998 |
Comment | Data last reviewed in March, 1967 |
Solid 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.
View plot Requires a JavaScript / HTML 5 canvas capable browser.
Temperature (K) | 298. to 1685. |
---|---|
A | 22.81719 |
B | 3.899510 |
C | -0.082885 |
D | 0.042111 |
E | -0.354063 |
F | -8.163946 |
G | 43.27846 |
H | 0.000000 |
Reference | Chase, 1998 |
Comment | Data last reviewed in March, 1967 |
Phase change 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.
Antoine Equation Parameters
log10(P) = A − (B / (T + C))
P = vapor pressure (bar)
T = temperature (K)
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Temperature (K) | A | B | C | Reference | Comment |
---|---|---|---|---|---|
1997. to 2560. | 9.56436 | 23308.848 | -123.133 | Stull, 1947 | Coefficents calculated by NIST from author's data. |
Reaction thermochemistry data
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Gas phase ion energetics data, Ion clustering 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 by: John E. Bartmess
Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. A general reaction search form is also available. Future versions of this site may rely on reaction search pages in place of the enumerated reaction displays seen below.
Individual Reactions
By formula: (Si4- • 4294967295Si) + Si = Si4-
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 411. ± 29. | kJ/mol | N/A | Nakajima, Taguwa, et al., 1995 | gas phase; Vertical Detachment Energy: 2.15±0.04 eV. |
(CAS Reg. No. 11080-58-3 • 4294967295) +
= CAS Reg. No. 11080-58-3
By formula: (CAS Reg. No. 11080-58-3 • 4294967295Si) + Si = CAS Reg. No. 11080-58-3
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 305. ± 14. | kJ/mol | N/A | Kawamata, Neigishi, et al., 1996 | gas phase; Vertical Detachment Energy: 0.81±0.05 eV. |
(CAS Reg. No. 106389-62-2 • 4294967295) +
= CAS Reg. No. 106389-62-2
By formula: (CAS Reg. No. 106389-62-2 • 4294967295Si) + Si = CAS Reg. No. 106389-62-2
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 469. ± 34. | kJ/mol | N/A | Xu, Taylor, et al., 1998 | gas phase |
By formula: (Si3- • 4294967295Si) + Si = Si3-
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 19. ± 18. | kJ/mol | N/A | Arnold and Neumark, 1994 | gas phase |
(CAS Reg. No. 64236-73-3 • 4294967295) +
= CAS Reg. No. 64236-73-3
By formula: (CAS Reg. No. 64236-73-3 • 4294967295Si) + Si = CAS Reg. No. 64236-73-3
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 523. ± 17. | kJ/mol | N/A | Nimlos, Harding, et al., 1987 | gas phase |
By formula: (HSi- • 4294967295Si) + Si = HSi-
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 350. ± 13. | kJ/mol | N/A | Kasdan, Herbst, et al., 1975 | gas phase |
Gas phase ion energetics data
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Ion clustering data, References, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Data evaluated as indicated in comments:
HL - Edward P. Hunter and Sharon G. Lias
L - Sharon G. Lias
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
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
View reactions leading to Si+ (ion structure unspecified)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
IE (evaluated) | 8.15169 | eV | N/A | N/A | L |
Quantity | Value | Units | Method | Reference | Comment |
Proton affinity (review) | 837. | kJ/mol | N/A | Hunter and Lias, 1998 | HL |
Quantity | Value | Units | Method | Reference | Comment |
Gas basicity | 814.1 | kJ/mol | N/A | Hunter and Lias, 1998 | HL |
Electron affinity determinations
EA (eV) | Method | Reference | Comment |
---|---|---|---|
1.389517 ± 0.000044 | LPD | Blondel, Chaibi, et al., 2005 | (28)Si: 1.3895213(13) eV; revised analysis of Blondel, Delsart, et al., 2001; B |
1.38952 | LPD | Blondel, Delsart, et al., 2001 | Given: 1.3895220(24) eV, or 11207.252(18) cm-1; B |
1.389517 ± 0.000044 | LPD | Scheer, Bilodeau, et al., 1998 | Given: 1.389521(20) eV; B |
1.3850 ± 0.0050 | LPES | Kasdan, Herbst, et al., 1975 | B |
Ionization energy determinations
IE (eV) | Method | Reference | Comment |
---|---|---|---|
8.15169 | EVAL | Lide, 1992 | LL |
8.152 | S | Kelly, 1987 | LBLHLM |
8.2 ± 0.5 | EI | Muenow, 1974 | LLK |
8.15166 ± 0.00003 | S | Brown, Tilford, et al., 1974 | LLK |
8.1 ± 0.5 | EI | Guido and Gigli, 1973 | LLK |
8.5 ± 0.5 | EI | Hildenbrand, 1972 | LLK |
8.15169 | S | Moore, 1970 | RDSH |
Ion clustering data
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, 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.
Data compiled by: John E. Bartmess
Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. Searches may be limited to ion clustering reactions. A general reaction search form is also available.
Clustering reactions
By formula: (HSi- • 4294967295Si) + Si = HSi-
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 350. ± 13. | kJ/mol | N/A | Kasdan, Herbst, et al., 1975 | gas phase |
By formula: (Si3- • 4294967295Si) + Si = Si3-
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 19. ± 18. | kJ/mol | N/A | Arnold and Neumark, 1994 | gas phase |
By formula: (Si4- • 4294967295Si) + Si = Si4-
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 411. ± 29. | kJ/mol | N/A | Nakajima, Taguwa, et al., 1995 | gas phase; Vertical Detachment Energy: 2.15±0.04 eV. |
References
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
Cox, Wagman, et al., 1984
Cox, J.D.; Wagman, D.D.; Medvedev, V.A.,
CODATA Key Values for Thermodynamics, Hemisphere Publishing Corp., New York, 1984, 1. [all data]
Chase, 1998
Chase, M.W., Jr.,
NIST-JANAF Themochemical Tables, Fourth Edition,
J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]
Stull, 1947
Stull, Daniel R.,
Vapor Pressure of Pure Substances. Organic and Inorganic Compounds,
Ind. Eng. Chem., 1947, 39, 4, 517-540, https://doi.org/10.1021/ie50448a022
. [all data]
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]
Kawamata, Neigishi, et al., 1996
Kawamata, H.; Neigishi, Y.; Kishi, R.; Iwata, S.; Nakajima, A.; Kaya, K.,
Photoelectron Spectroscopy of Silicon-Fluorine Binary Cluster Anions (SinFm-),
J. Chem. Phys., 1996, 105, 13, 5369, https://doi.org/10.1063/1.472377
. [all data]
Xu, Taylor, et al., 1998
Xu, C.S.; Taylor, T.R.; Burton, G.R.; Neumark, D.M.,
Vibrationally reserved photoelectron spectroscopy of silicon cluster anions Si-n(-) (n=3-7),
J. Chem. Phys., 1998, 108, 4, 1395-1406, https://doi.org/10.1063/1.475511
. [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]
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]
Kasdan, Herbst, et al., 1975
Kasdan, A.; Herbst, E.; Lineberger, W.C.,
Laser photoelectron spectrometry of the negative ions of silicon and its hydrides,
J. Chem. Phys., 1975, 62, 541. [all data]
Hunter and Lias, 1998
Hunter, E.P.; Lias, S.G.,
Evaluated Gas Phase Basicities and Proton Affinities of Molecules: An Update,
J. Phys. Chem. Ref. Data, 1998, 27, 3, 413-656, https://doi.org/10.1063/1.556018
. [all data]
Blondel, Chaibi, et al., 2005
Blondel, C.; Chaibi, W.; Delsart, C.; Drag, C.; Goldfarb, F.; Kroger, S.,
The electron affinities of O, Si, and S revisited with the photodetachment microscope,
Eur. Phys. J. D, 2005, 33, 3, 335-342, https://doi.org/10.1140/epjd/e2005-00069-9
. [all data]
Blondel, Delsart, et al., 2001
Blondel, C.; Delsart, C.; Goldfarb, F.,
Electron spectrometry at the mu eV level and the electron affinities of Si and F,
J. Phys. B: Atom. Mol. Opt. Phys., 2001, 34, 9, L281-L288, https://doi.org/10.1088/0953-4075/34/9/101
. [all data]
Scheer, Bilodeau, et al., 1998
Scheer, M.; Bilodeau, R.C.; Brodie, C.A.; Haugen, H.K.,
Systematic study of the stable states of C-, Si-, Ge-, and Sn- via infrared laser spectroscopy,
Phys. Rev. A, 1998, 58, 4, 2844-2856, https://doi.org/10.1103/PhysRevA.58.2844
. [all data]
Lide, 1992
Lide, D.R. (Editor),
Ionization potentials of atoms and atomic ions
in Handbook of Chem. and Phys., 1992, 10-211. [all data]
Kelly, 1987
Kelly, R.L.,
Atomic and ionic spectrum lines of hydrogen through kryton,
J. Phys. Chem. Ref. Data, 1987, 16. [all data]
Muenow, 1974
Muenow, D.W.,
Mass spectrometric determination of the heats of formation and atomization energies of the molecules Ge2N and GeSiN,
J. Chem. Phys., 1974, 60, 3382. [all data]
Brown, Tilford, et al., 1974
Brown, C.M.; Tilford, S.G.; Tousey, R.; Ginter, M.L.,
Absorption spectrum of Si I between 1500 and 1900 A,
J. Opt. Soc. Am., 1974, 64, 1665. [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]
Hildenbrand, 1972
Hildenbrand, D.L.,
The gaseous equilibrium Ge + SiO = GeO + Si and the dissociation energy of SiO,
High Temp. Sci., 1972, 4, 244. [all data]
Moore, 1970
Moore, C.E.,
Ionization potentials and ionization limits derived from the analyses of optical spectra,
Natl. Stand. Ref. Data Ser., (U.S. Natl. Bur. Stand.), 1970, 34, 1. [all data]
Notes
Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Reaction thermochemistry data, Gas phase ion energetics data, Ion clustering data, References
- Symbols used in this document:
EA Electron affinity IE (evaluated) Recommended ionization energy S°gas,1 bar Entropy of gas at standard conditions (1 bar) S°liquid,1 bar Entropy of liquid at standard conditions (1 bar) S°solid Entropy of solid at standard conditions S°solid,1 bar Entropy of solid at standard conditions (1 bar) ΔfH°gas Enthalpy of formation of gas at standard conditions ΔfH°liquid Enthalpy of formation of liquid at standard conditions ΔrH° Enthalpy of reaction at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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