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If the parent molecule has nNuclei non zero, then
each state will have nNuclei LinearNucleus
objects. (In principle the Spin
and AsNext
properties should be set at the molecule level, but in fact have
been implemented at the state level, and any change in these two
properties is copied to all the states in the molecule.) The
following coupling scheme is normally used:

F_{1}
= J_{1 + }I_{1; }F_{2} = F_{1 + }I_{2}; ... F = F_{n-1} + I_{n
}

though at alternative scheme must be used for equivalent nuclei,
as described under the AsNext
setting.Note that only nuclei not explicitly simulated with nucleus
objects should be included in calculating the SymWt and AsymWt statistical weights. If all
equivalent nuclei have been explicitly included, then the
statistical weights should be calculated as if there were an
additional pair of equivalent spin zero nuclei, which will mean
AsymWt must be set to zero. A simple
check for correct operation is to compare the rotational
structure with and without the nuclei explicitly included, with
the weights calculated in the latter case including all nuclei.
If the linewidth is set somewhat larger than the width of the
hyperfine structure the spectra should appear identical.

For interactions between nuclei, see the Nuclear Spin - Nuclear Spin Coupling.