neptunium

• Formula: Np
• Molecular weight: 237
• IUPAC Standard InChI: InChI=1S/Np Copy

  
• IUPAC Standard InChIKey: LFNLGNPSGWYGGD-UHFFFAOYSA-N Copy
• CAS Registry Number: 7439-99-8
• Chemical structure:
  This structure is also available as a 2d Mol file
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• Information on this page:
  • Gas phase ion energetics data
  • References
  • Notes
• Other data available:
  • Phase change data
• 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)
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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

Ionization energy determinations

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.

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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• Symbols used in this document:
  

  IE (evaluated)

  Recommended ionization energy

• Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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