Cesium
- Formula: Cs
- Molecular weight: 132.9054519
- IUPAC Standard InChIKey: TVFDJXOCXUVLDH-UHFFFAOYSA-N
- CAS Registry Number: 7440-46-2
- Chemical structure:
This structure is also available as a 2d Mol file - Other names: Caesium
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- Other data available:
- 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)
- Gas Phase Kinetics Database
- X-ray Photoelectron Spectroscopy Database, version 5.0
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Gas phase thermochemistry data
Go To: Top, 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 | 18.3 ± 0.24 | kcal/mol | Review | Cox, Wagman, et al., 1984 | CODATA Review value |
ΔfH°gas | 18.28 | kcal/mol | Review | Chase, 1998 | Data last reviewed in June, 1968 |
Quantity | Value | Units | Method | Reference | Comment |
S°gas,1 bar | 41.9696 ± 0.0007 | cal/mol*K | Review | Cox, Wagman, et al., 1984 | CODATA Review value |
S°gas,1 bar | 41.969 | cal/mol*K | Review | Chase, 1998 | Data last reviewed in June, 1968 |
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) | 947.967 to 1000. | 1000. to 4000. | 4000. to 6000. |
---|---|---|---|
A | 4.967981 | 8.234761 | -43.26979 |
B | -1.354951×10-8 | -3.297469 | 19.11800 |
C | 1.725201×10-8 | 0.987707 | -2.195451 |
D | -7.377821×10-9 | -0.032919 | 0.078861 |
E | -9.368041×10-11 | -0.944165 | 89.40179 |
F | 16.80280 | 13.91510 | 123.7130 |
G | 47.98141 | 50.32139 | 57.90600 |
H | 18.28400 | 18.28400 | 18.28400 |
Reference | Chase, 1998 | Chase, 1998 | Chase, 1998 |
Comment | Data last reviewed in June, 1968 | Data last reviewed in June, 1968 | Data last reviewed in June, 1968 |
Gas phase ion energetics data
Go To: Top, Gas phase 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:
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 Cs+ (ion structure unspecified)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
IE (evaluated) | 3.89390 ± 0.000002 | eV | N/A | N/A | L |
Electron affinity determinations
EA (eV) | Method | Reference | Comment |
---|---|---|---|
0.471630 ± 0.000044 | N/A | Scheer, Tho/gersen, et al., 1998 | Given: 0.47164(6) eV; B |
0.471630 ± 0.000044 | LPD | Slater, Read, et al., 1978 | Given: 0.47160(25) eV; B |
0.4700 ± 0.0030 | LPES | Patterson, Hotop, et al., 1974 | B |
Ionization energy determinations
IE (eV) | Method | Reference | Comment |
---|---|---|---|
3.89390 | EVAL | Lide, 1992 | LL |
3.9 | EI | Busse and Weil, 1982 | LBLHLM |
3.89 | PE | Williams and Potts, 1976 | LLK |
3.89 | EI | Nygaard and Hahn, 1974 | LLK |
3.89390 ± 0.000002 | S | Moore, 1970 | RDSH |
Ion clustering data
Go To: Top, Gas phase 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: (Br- • 4294967295Cs) + Cs = Br-
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 29.80 ± 0.96 | kcal/mol | N/A | Miller, Leopold, et al., 1986 | gas phase; Extrapolated by polarizability and radius from experimental data. |
References
Go To: Top, Gas phase 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]
Scheer, Tho/gersen, et al., 1998
Scheer, M.; Tho/gersen, J.; Bilodeau, R.C.; Brodie, C.A.; Haugen, H.K.,
Experimental Evidence that the 6s6p2Pj States of Cs- are Shape Resonances,
Phys. Rev. Lett., 1998, 80, 4, 684, https://doi.org/10.1103/PhysRevLett.80.684
. [all data]
Slater, Read, et al., 1978
Slater, J.; Read, F.H.; Novick, S.E.; Lineberger, W.C.,
Alkali Negative Ions. III. Multichannel Photodetachment of Cs- and K-,
Phys. Rev. A, 1978, 17, 1, 201, https://doi.org/10.1103/PhysRevA.17.201
. [all data]
Patterson, Hotop, et al., 1974
Patterson, T.A.; Hotop, H.; Kasdan, A.; Norcross, D.W.; Lineberger, W.C.,
Resonances in Alkali Negative-Ion Photodetachment and Electron Affinities of the Corresponding Neutrals,
Phys. Rev. Lett., 1974, 32, 5, 189, https://doi.org/10.1103/PhysRevLett.32.189
. [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]
Busse and Weil, 1982
Busse, B.; Weil, K.G.,
Mass spectrometric studies on the vapour phase composition over solid and fused Cs3Sb,
Ber. Bunsen-Ges. Phys. Chem., 1982, 86, 93. [all data]
Williams and Potts, 1976
Williams, T.A.; Potts, A.W.,
Complexities in the HeI photoelectron spectra of alkali metal vapours,
J. Electron Spectrosc. Relat. Phenom., 1976, 8, 331. [all data]
Nygaard and Hahn, 1974
Nygaard, K.J.; Hahn, Y.B.,
Ion fluorescene in cesium,
Physica, 1974, 75, 333. [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]
Miller, Leopold, et al., 1986
Miller, T.M.; Leopold, D.G.; Murray, K.K.; Lineberger, W.C.,
Electron Affinities of the Alkali Halides and the Structure of their Negative Ions,
J. Chem. Phys., 1986, 85, 5, 2368, https://doi.org/10.1063/1.451091
. [all data]
Notes
Go To: Top, Gas phase 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) 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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