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neptunium


Phase change 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.

Antoine Equation Parameters

log10(P) = A − (B / (T + C))
    P = vapor pressure (bar)
    T = temperature (K)

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Temperature (K) A B C Reference Comment
1617.99 - 2073.994.1571819215.926-114.171Ackermann and Rauh, 1975Coefficents calculated by NIST from author's data.

Gas phase ion energetics data

Go To: Top, Phase change 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
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron

Quantity Value Units Method Reference Comment
IE (evaluated)6.2655 ± 0.0002eVN/AN/AL

Ionization energy determinations

IE (eV) Method Reference Comment
6.2655 ± 0.0002LSTrautmann, 1994LL
6.2657EVALLide, 1992LL
6.2657 ± 0.0005SWorden and Conway, 1979LLK
6.1 ± 0.1EIRauh and Ackermann, 1975LLK
6.19 ± 0.12EVALSugar, 1974LLK
6.20 ± 0.12SSugar, 1973LLK
6.16 ± 0.06SISmith and Hertel, 1969RDSH

References

Go To: Top, Phase change 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.

Ackermann and Rauh, 1975
Ackermann, R.J.; Rauh, E.G., The Thermodynamics of Vaporization of Neptunium and Plutonium, J. Chem. Thermodyn., 1975, 7, 3, 211-218, https://doi.org/10.1016/0021-9614(75)90058-0 . [all data]

Trautmann, 1994
Trautmann, N., Accurate determination of the first ionization potential of actinides by laser spectroscopy, J. Alloys Compd., 1994, 213/214, 28. [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]

Worden and Conway, 1979
Worden, E.F.; Conway, J.G., Laser spectroscopy of neptunium; first ionization potential, lifetimes and new high-lying energy levels of Np I, J. Opt. Soc. Am., 1979, 69, 733. [all data]

Rauh and Ackermann, 1975
Rauh, E.G.; Ackermann, R.J., The first ionization potentials of neptunium and neptunium monoxide, J. Chem. Phys., 1975, 62, 1584. [all data]

Sugar, 1974
Sugar, J., Revised ionization energies of the neutral actinides, J. Chem. Phys., 1974, 60, 4103. [all data]

Sugar, 1973
Sugar, J., Ionization energies of the neutral actinides, J. Chem. Phys., 1973, 59, 788. [all data]

Smith and Hertel, 1969
Smith, D.H.; Hertel, G.R., First ionization potentials of Th, Np, and Pu by surface ionization, J. Chem. Phys., 1969, 51, 3105. [all data]


Notes

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