Tetrasulfur
- Formula: S4
- Molecular weight: 128.260
- CAS Registry Number: 19269-85-3
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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.
| Quantity | Value | Units | Method | Reference | Comment |
|---|---|---|---|---|---|
| S°gas,1 bar | 74.247 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in September, 1977 |
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.
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| Temperature (K) | 298. to 6000. |
|---|---|
| A | 19.09190 |
| B | 0.783077 |
| C | -0.000024 |
| D | 0.000002 |
| E | -0.281991 |
| F | -6.672871 |
| G | 95.53090 |
| H | 0.000000 |
| Reference | Chase, 1998 |
| Comment | Data last reviewed in September, 1977 |
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:
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 S4+ (ion structure unspecified)
Electron affinity determinations
| EA (eV) | Method | Reference | Comment |
|---|---|---|---|
| 2.220 ± 0.030 | LPD | Hunsicker, Jones, et al., 1995 | Vertical Detachment Energy: 2.42±0.05 eV); B |
Ionization energy determinations
| IE (eV) | Method | Reference | Comment |
|---|---|---|---|
| 10.1 ± 0.2 | EI | Rosinger, Grade, et al., 1983 | LBLHLM |
| 10.4 ± 0.5 | EI | Hagemann, 1962 | 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]
Hunsicker, Jones, et al., 1995
Hunsicker, S.; Jones, R.O.; Gantefor, G.,
Rings and chains in sulfur cluster anions S- to S-9(-): Theory (simulated annealing) and experiment (photoelectron detachment),
J. Chem. Phys., 1995, 102, 15, 5917, https://doi.org/10.1063/1.469326
. [all data]
Rosinger, Grade, et al., 1983
Rosinger, W.; Grade, M.; Hirschwald, W.,
Detection of ion states of S2 to S8 by electron impact,
Int. J. Mass Spectrom. Ion Processes, 1983, 47, 239. [all data]
Hagemann, 1962
Hagemann, R.,
Determination de la chaleur de formation de S2O par spectrometrie de masse,
Compt. Rend., 1962, 255, 1102. [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) - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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