Time-resolved (TR) spectra of 5CB in the millisecond domain were obtained during excitation with electric fields of different time dependence: ac, dc, and ac + dc. The response to ac excitation occurs mainly at twice the modulating frequency. The effect of the addition of dc to an ac field is the induction of an additional response at the ac frequency. The additional 'single frequency' response persists indefinitely, even though the response to the application of only a permanent dc field relaxes within roughly 200 ms. The amplitude of the oscillating responses diminishes with increasing ac frequency. This result is in accordance with the expected response to the torque exerted by the ac field. Different functional group absorptions respond without a significant phase difference in this time scale.

PDF Article

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
Login to access OSA Member Subscription