Si4 anion
- Formula: Si4-
- Molecular weight: 112.3425
- CAS Registry Number: 106389-61-1
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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 | 112.3 ± 5.4 | kcal/mol | R-EA | Nakajima, Taguwa, et al., 1995 | Vertical Detachment Energy: 2.15±0.04 eV. |
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: (Si4- • 4294967295Si) + Si = Si4-
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 98.2 ± 6.9 | kcal/mol | N/A | Nakajima, Taguwa, et al., 1995 | gas phase; Vertical Detachment Energy: 2.15±0.04 eV. |
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 = 17180 ± 80 | gas | Kitsopoulos, Chick, et al., 1990 | |||||
Arnold and Neumark, 1993 | |||||||
Xu, Taylor, et al., 1998 | |||||||
State: A
Energy (cm-1) |
Med. | Transition | λmin (nm) |
λmax (nm) |
References | ||
---|---|---|---|---|---|---|---|
To = 11438 | gas | A-X | 747 | 875 | Achiba, Kohno, et al., 2005 | ||
To = 11460 ± 3 | Ne | A-X | 780 | 875 | Fulara, Freivogel, et al., 1996 | ||
Vib. sym. |
No. | Approximate type of mode |
cm-1 | Med. | Method | References | |
---|---|---|---|---|---|---|---|
Ag | 1 | 343 | gas | MPD | Achiba, Kohno, et al., 2005 | ||
ag | 1 | 352 ± 4 | Ne | AB | Fulara, Freivogel, et al., 1996 | ||
2 | 277 | gas | MPD | Achiba, Kohno, et al., 2005 | |||
2 | 278 ± 4 | Ne | AB | Fulara, Freivogel, et al., 1996 | |||
State: X
Vib. sym. |
No. | Approximate type of mode |
cm-1 | Med. | Method | References | |
---|---|---|---|---|---|---|---|
ag | 2 | 365 | gas | TPE | Arnold and Neumark, 1993 | ||
Additional references: Jacox, 1994, page 183; Jacox, 1998, page 247; Jacox, 2003, page 218
Notes
o | Energy separation between the v = 0 levels of the excited and electronic ground states. |
d | Photodissociation threshold |
References
Go To: Top, Gas phase thermochemistry data, Ion clustering data, Vibrational and/or electronic energy levels, Notes
Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.
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]
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]
Arnold and Neumark, 1993
Arnold, C.C.; Neumark, D.M.,
Study of Si4 and Si4- using threshold photodetachment (ZEKE) spectroscopy,
J. Chem. Phys., 1993, 99, 5, 3353, https://doi.org/10.1063/1.465145
. [all data]
Xu, Taylor, et al., 1998
Xu, C.; Taylor, T.R.; Burton, G.R.; Neumark, D.M.,
Vibrationally resolved photoelectron spectroscopy of silicon cluster anions Si[sub n][sup -] (n=3--7),
J. Chem. Phys., 1998, 108, 4, 1395, https://doi.org/10.1063/1.475511
. [all data]
Achiba, Kohno, et al., 2005
Achiba, Y.; Kohno, M.; Ohara, M.; Suzuki, S.; Shiromaru, H.,
Electron detachment spectroscopic study on carbon and silicon cluster anions,
J. Electron Spectrosc. Relat. Phenom., 2005, 142, 3, 231, https://doi.org/10.1016/j.elspec.2004.09.016
. [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]
Jacox, 2003
Jacox, M.E.,
Vibrational and electronic energy levels of polyatomic transient molecules: supplement B,
J. Phys. Chem. Ref. Data, 2003, 32, 1, 1-441, https://doi.org/10.1063/1.1497629
. [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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