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 1.07DESCRIPTION
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
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.