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Polydispersity Index

This index is a number calculated from a simple 2 parameter fi t to the
correlation data (the cumulants analysis). The Polydispersity Index is
dimensionless and scaled such that values smaller than 0.05 are rarely
seen other than with highly monodisperse standards. Values greater
than 0.7 indicate that the sample has a very broad size distribution and
is probably not suitable for the dynamic light scattering (DLS) technique.
The various size distribution algorithms work with data that falls between
these two extremes. The calculations for these parameters are defi ned in
the ISO standard document 13321:1996 E and ISO 22412:2008.
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