  Parametrized crystal-field analyses are presented for both the six and seven
fold coordinated, C$_{1}$ symmetry Sm$^{3+}$ centers in Y$_{2}$SiO$_{5}$, based
on extensive spectroscopic data spanning the infrared to optical regions. Laser
site-selective excitation and fluorescence spectroscopy as well as Zeeman
absorption spectroscopy performed along multiple crystallographic directions
has been utilised, in addition to previously determined $g$ tensors for the
$^{6}$H$_{5/2}$Z$_{1}$ and $^{4}$G$_{5/2}$A$_{1}$ states. The resultant
analyses give good approximation to the experimental energy levels and magnetic
splittings, yielding crystal-field parameters consistent with the few other
lanthanide ions for which such analyses are available.
