  We investigate how optimal control theory can be used to improve Circular
Dichroism (CD) signals for A--band of fenchone measured via the photoionization
yield upon further excitation. These transitions are electric dipole forbidden
to first order, which translates into low population transfer to the excited
state (~8%) but also allows for a clearer interplay between electric and
magnetic transition dipole moments, which are of the same order of magnitude.
Using a model including the electronic ground and excited A state as well as
all permanent and transition multipole moments up to the electric quadrupole,
we find that the absolute CD signal of randomly oriented molecules can be
increased by a factor 3.5 when using shaped laser pulses, with the anisotropy
parameter g increasing from 0.06 to 1. Our insights provide additional evidence
on how optimal control can assist in amplifying chiral signatures via
interactions of permanent and transition multipole moments.
