软件包：libchemistry-isotope-perl（0.11-2）

table of the isotopes exact mass data

Chemistry::Isotope contains the exact mass data from the table of the isotopes. It has an exportable function, isotope_mass, which returns the mass of an atom in mass units given its mass number (A) and atomic number (Z); and a function isotope_abundance which returns a table with the natural abundance of the isotopes given an element symbol.

The table of the masses includes 2931 nuclides and is taken from http://ie.lbl.gov/txt/awm95.txt (G. Audi and A.H. Wapstra, Nucl. Phys. A595, 409, 1995)

The table of natural abundances includes 288 nuclides and is taken from the Commission on Atomic Weights and Isotopic Abundances report for the International Union of Pure and Applied Chemistry in Isotopic Compositions of the Elements 1989, Pure and Applied Chemistry, 1998, 70, 217. http://www.iupac.org/publications/pac/1998/pdf/7001x0217.pdf

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