selenium
- Formula: Se
- Molecular weight: 78.96
- IUPAC Standard InChIKey: BUGBHKTXTAQXES-UHFFFAOYSA-N
- CAS Registry Number: 7782-49-2
- Chemical structure:
This structure is also available as a 2d Mol file - Other names: Selenium atom
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- Information on this page:
- 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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Phase change 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.
Data compiled as indicated in comments:
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
Tc | 1766. | K | N/A | Rau, 1974 | Uncertainty assigned by TRC = 1.76 K; TRC |
Quantity | Value | Units | Method | Reference | Comment |
Pc | 271.551 | bar | N/A | Rau, 1974 | Uncertainty assigned by TRC = 2.7133 bar; TRC |
Quantity | Value | Units | Method | Reference | Comment |
ρc | 15.64 | mol/l | N/A | Rau, 1974 | Uncertainty assigned by TRC = 0.0156 mol/l; TRC |
Antoine Equation Parameters
log10(P) = A − (B / (T + C))
P = vapor pressure (bar)
T = temperature (K)
View plot Requires a JavaScript / HTML 5 canvas capable browser.
Temperature (K) | A | B | C | Reference | Comment |
---|---|---|---|---|---|
629. to 953. | 6.33714 | 6588.125 | 86.633 | Stull, 1947 | Coefficents calculated by NIST from author's data. |
Gas phase ion energetics 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 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
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
B - John E. Bartmess
View reactions leading to Se+ (ion structure unspecified)
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
IE (evaluated) | 9.75238 | eV | N/A | N/A | L |
Electron affinity determinations
EA (eV) | Method | Reference | Comment |
---|---|---|---|
2.0206 | N/A | Vandevraye, Drag, et al., 2012 | Given: 2.0206046(11) eV; B |
2.020682 ± 0.000044 | LPD | Mansour, Edge, et al., 1988 | B |
Ionization energy determinations
IE (eV) | Method | Reference | Comment |
---|---|---|---|
9.75238 | EVAL | Lide, 1992 | LL |
9.752 | S | Kelly, 1987 | LBLHLM |
9.75238 | S | Moore, 1970 | RDSH |
Ion clustering data
Go To: Top, Phase change 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: (Se2- • 4294967295Se) + Se = Se2-
Quantity | Value | Units | Method | Reference | Comment |
---|---|---|---|---|---|
ΔrH° | 300. ± 13. | kJ/mol | N/A | Snodgrass, Coe, et al., 1989 | gas phase |
References
Go To: Top, Phase change 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.
Rau, 1974
Rau, H.,
Vapour composition and critical constants of selenium,
J. Chem. Thermodyn., 1974, 6, 525. [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]
Vandevraye, Drag, et al., 2012
Vandevraye, M.; Drag, C.; Blondel, C.,
Electron affinity of selenium measured by photodetachment microscopy,
Phys. Rev. A, 2012, 85, 1, 015401, https://doi.org/10.1103/PhysRevA.85.015401
. [all data]
Mansour, Edge, et al., 1988
Mansour, N.B.; Edge, C.J.; Larson, D.J.,
Laser Photodetachment Spectroscopy of Se- and S-,
Nucl. Instrum. Meth. Phys. Res. B, 1988, 31, 1-2, 313-316, https://doi.org/10.1016/0168-583X(88)90437-5
. [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]
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]
Snodgrass, Coe, et al., 1989
Snodgrass, J.T.; Coe, J.V.; McHugh, K.M.; Freidhoff, C.B.; Bowen, K.H.,
Photoelectron Spectroscopy of the Selenium and Tellurium Containing Negative Ions: SeO2-, Se2- and Te2-,
J. Phys. Chem., 1989, 93, 4, 1249, https://doi.org/10.1021/j100341a016
. [all data]
Notes
Go To: Top, Phase change data, Gas phase ion energetics data, Ion clustering data, References
- Symbols used in this document:
EA Electron affinity IE (evaluated) Recommended ionization energy Pc Critical pressure Tc Critical temperature ΔrH° Enthalpy of reaction at standard conditions ρc Critical density - Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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