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 (atm)
    T = temperature (K)

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Temperature (K) A B C Reference Comment
1617.99 to 2073.994.1514719215.926-114.171Ackermann and Rauh, 1975Coefficents 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
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

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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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