Si3 anion
- Formula: Si3-
- Molecular weight: 84.2570
- CAS Registry Number: 106411-50-1
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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.
Data compiled by: John E. Bartmess
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔfH°gas | 103.0 ± 3.8 | kcal/mol | R-EA | Arnold and Neumark, 1994 |
Reaction 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.
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: (Si3- • 4294967295Si) + Si = Si3-
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 4.6 ± 4.3 | kcal/mol | N/A | Arnold and Neumark, 1994 | gas phase |
Ion clustering 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.
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: (Si3- • 4294967295Si) + Si = Si3-
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 4.6 ± 4.3 | kcal/mol | N/A | Arnold and Neumark, 1994 | gas phase |
Vibrational and/or electronic energy levels
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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: Marilyn E. Jacox
State: ?
Energy (cm-1) |
Med. | Transition | λmin (nm) |
λmax (nm) |
References | ||
---|---|---|---|---|---|---|---|
Td = 18565 ± 10 | gas | Kitsopoulos, Chick, et al., 1990 | |||||
Arnold and Neumark, 1994 | |||||||
State: 2A1
Energy (cm-1) |
Med. | Transition | λmin (nm) |
λmax (nm) |
References | ||
---|---|---|---|---|---|---|---|
To = 9946 ± 2 | Ne | 2A1-X | 820 | 1040 | Fulara, Freivogel, et al., 1996 | ||
Vib. sym. |
No. | Approximate type of mode |
cm-1 | Med. | Method | References | |
---|---|---|---|---|---|---|---|
a1 | 1 | Sym. stretch | 495 ± 5 | Ne | AB | Fulara, Freivogel, et al., 1996 | |
2 | Bend | 402 ± 5 | Ne | AB | Fulara, Freivogel, et al., 1996 | ||
State: X
Vib. sym. |
No. | Approximate type of mode |
cm-1 | Med. | Method | References | |
---|---|---|---|---|---|---|---|
a1 | 1 | Sym. stretch | 565 ± 15 | T | gas | TPE | Arnold and Neumark, 1994 |
Additional references: Jacox, 1994, page 68; Jacox, 1998, page 173
Notes
T | Tentative assignment or approximate value |
o | Energy separation between the v = 0 levels of the excited and electronic ground states. |
d | Photodissociation threshold |
References
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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
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]
Fulara, Freivogel, et al., 1996
Fulara, J.; Freivogel, P.; Grutter, M.; Maier, J.P.,
Electronic Absorption Spectra of Si,
J. Phys. Chem., 1996, 100, 46, 18042, https://doi.org/10.1021/jp962575h
. [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]
Notes
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- Symbols used in this document:
ΔfH°gas Enthalpy of formation of gas at standard conditions ΔrH° Enthalpy of reaction at standard conditions - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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