NAME

       Chemistry::Isotope - Table of the isotopes exact mass data

SYNOPSIS

           use Chemistry::Isotope ':all';

           # get the exact atomic mass for an isotope
           my $m  = isotope_mass(235, 92); # 235.043923094753

           my $ab_table = isotope_abundance('C');
           while (my ($A, $percent_ab) = each %$ab_table) {
               print "$A\t$percent_ab\n";
           }
           # this should print (the order may vary):
           # 12    98.93
           # 13    1.07

DESCRIPTION

       This module 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>

FUNCTIONS

   isotope_mass($A, $Z)
       Return the mass for the atom with the given mass number and atomic number, or undef if the
       nuclide is not in the data table.

   isotope_abundance($symbol)
       Returns a hash reference with the natural abundance information for the isotopes of a
       given element. The hash keys are the mass numbers, and the values are the abundance
       percentages. For example, isotope_abundance('C') returns the following structure:

           {
               '13' => '1.07',
               '12' => '98.93'
           };

VERSION

       0.11

SEE ALSO

       Chemistry::Atom

       The PerlMol website <http://www.perlmol.org/>

AUTHOR

       Ivan Tubert-Brohman <itub@cpan.org>

COPYRIGHT

       Copyright (c) 2005 Ivan Tubert-Brohman. All rights reserved. This program is free
       software; you can redistribute it and/or modify it under the same terms as Perl itself.