Long-Lasting Orientation of Symmetric-Top Molecules Excited by Two-Color Femtosecond Pulses

Impulsive orientation of symmetric-top molecules excited by two-color femtosecond pulses is considered. In addition to the well-known transient appearing immediately after pulse and then reemerging periodically due quantum revivals, we report phenomenon field-free long-lasting orientation. Long-lasting means that time averaged remains non-zero until destroyed other physical effects, e.g., intermolecular collisions. The effect caused combined action field-polarizability field-hyperpolarizability interactions. dependence degree on temperature parameters can be measured second (or higher-order) harmonic generation, may used control deflection traveling through inhomogeneous electrostatic fields.