  Motivated by the recent success of optical trapping of alkali bosons, we have
studied the zeroth sound modes of dilute Fermi gases with arbitrary spin-f,
which are spin-S excitations ($0\leq S\leq 2f$). The dispersion of the mode (S)
depends on a single Landau parameter $F^{(S)}$, which is related to the
scattering lengths of the system through a simple formula. Measurement of (even
a subset of) these modes in finite magnetic fields will enable one to determine
all the interaction parameters of the system.
