  The field-free alignment and orientation of the linear molecule by the
two-color trapezoidal laser pulses were theoretically investigated. The
trapezoidal shape of a laser pulse allows to enhance the maximum alignment
degree for the same intensity and duration comparing to the conventional
Gaussian laser pulse. The alignment and orientation persist after the pulse for
both non-adiabatic and adiabatic regimes. While the maximum (during the pulse)
alignment degree quickly saturates and remains almost constant with the pulse
duration increase, the dependencies of the maximum (outside the laser pulse)
alignment and orientation degrees on the pulse duration show the clear periodic
structures in the adiabatic regime. The effect of the non-zero temperature is
also shown. Applying additional the monochromatic or two-color prepulse
increases the maximum orientation degree, but the application of the two-color
prepulse leads to a higher maximum orientation degree than the monochromatic
prepulse. The effect of the relative phase variation on the molecular
orientation in case of one and two pulses was also discussed.
