  CS$_2$ is identified as a molecule for which distinction can be made between
dynamic and geometric alignment induced by intense laser fields. Measured
anisotropic angular distributions of fragment ions arise from (i) dynamic
alignment of the S-C-S axes along the laser polarization vector for 35-ps laser
pulses and (ii) geometric alignment due to an angle-dependent ionization rate
in the case of 100-fs pulses. Results of classical calculations of the
alignment dynamics support our observations. By comparing mass spectra obtained
with linearly- and circularly-polarized light it is not possible to distinguish
between dynamic and geometric alignment.
  33.80.Rv, 33.90.+h, 42.50.Vk
