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

• URL: http://arxiv.org/abs/2104.00307v1
• Date: Thu, 1 Apr 2021 07:28:31 GMT
• Title: Long-Lasting Orientation of Symmetric-top Molecules Excited by Two-Color Femtosecond Pulses
• Authors: Long Xu, Ilia Tutunnikov, Yehiam Prior, and Ilya Sh. Averbukh
• Abstract summary: Impulsive orientation of symmetric-top molecules excited by two-color femtosecond pulses is considered. In addition to the well-known transient orientation appearing immediately after the pulse, we report the phenomenon of field-free long-lasting orientation.
• Score: 4.239093018686964
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Impulsive orientation of symmetric-top molecules excited by two-color femtosecond pulses is considered. In addition to the well-known transient orientation appearing immediately after the pulse and then reemerging periodically due to quantum revivals, we report the phenomenon of field-free long-lasting orientation. Long-lasting means that the time averaged orientation remains non-zero until destroyed by other physical effects, e.g. intermolecular collisions. The effect is caused by the combined action of the field-polarizability and field-hyperpolarizability interactions. The dependence of degree of long-lasting orientation on temperature and pulse's parameters is considered. The effect can be measured by means of second (or higher-order) harmonic generation, and may be used to control the deflection of molecules traveling through inhomogeneous electrostatic fields.

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