  The real and imaginary parts of the susceptibility are fundamentally
associated with the molecular dispersion and absorption, respectively.
Measurement of the molecular dispersion has given insight into underlying
molecular dynamics such as the identification of conical intersections and
solute-solvent interactions. We show that when using a shaped pulse(s), it is
possible to mix the real and imaginary parts of the nonlinear susceptibility
into the molecular absorption. We then explain how to separate the real and
imaginary parts of the nonlinear susceptibility when using a shaped pulse(s).
We describe how the imaginary (absorption-like) and real (dispersion-like)
parts of the nonlinear susceptibility can be used to understand molecular
dynamics involving conical intersections in solvated molecules. We calculate
the inhomogenous lineshape for a solvated molecule and show that when the phase
is resonant with a vibrational line that the lineshape changes from
absorption-like to dispersion-like. We find that the linear polarization is
sensitive to the phase of the pulse.
