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
• Permanent link for this species. Use this link for bookmarking this species for future reference.
• Information on this page:
  • Phase change data
  • Gas phase ion energetics data
  • References
  • Notes
• 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)
• Options:
  • Switch to calorie-based units

Phase change data

Go To: Top, 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.

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.

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

Ionization energy determinations

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

Go To: Top, Phase change data, Gas phase ion energetics data, References

• Symbols used in this document:
  

  IE (evaluated)

  Recommended ionization energy

• Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
• The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high quality copy of the Database and to verify that the data contained therein have been selected on the basis of sound scientific judgment. However, NIST makes no warranties to that effect, and NIST shall not be liable for any damage that may result from errors or omissions in the Database.
• Customer support for NIST Standard Reference Data products.