nistiso

<p>A data frame giving the masses, standard isotopic
  abundances and nucleon numbers of most chemical elements
  as provided by the Physical Measurement Laboratory of the
  National Institute of Standards and Technology (but taken
  from separate publications). It includes the four
  variables <code>element</code> (the chemical symbol),
  <code>mass</code>, <code>abundance</code> and <code>nucleons</code>,
  arranged so that each isotope is uniquely specified by
  one row.</p>

datasets

data

Provides a function that quickly computes the fine structure
isotope patterns of a set of chemical formulas to a given degree of
accuracy (up to the limit set by errors in floating point arithmetic). A
data-set comprising the masses and isotopic abundances of individual
elements is also provided and calculation of isotopic gross structures
is also supported.

Andreas Ipsen

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nistiso: Masses, isotope patterns and nucleon numbers of the elements

Description

Arguments

References