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The Nature of the Dielectric Response of Methanol Revealed by the Terahertz Kerr Effect

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons21693

Kampfrath,  Tobias
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
Department of Physics, Freie Universität Berlin;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons37877

Campen,  R. Kramer
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons22250

Wolf,  Martin
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons79062

Sajadi,  Mohsen
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Kampfrath, T., Campen, R. K., Wolf, M., & Sajadi, M. (2018). The Nature of the Dielectric Response of Methanol Revealed by the Terahertz Kerr Effect. The Journal of Physical Chemistry Letters, 9(6), 1279-1283. doi:10.1021/acs.jpclett.7b03281.


Cite as: http://hdl.handle.net/21.11116/0000-0001-1C52-4
Abstract
The dielectric response of liquids in the terahertz (THz) and sub-THz frequency range arises from low-energy collective molecular motions, which are often strongly influenced by intermolecular interactions. To shed light on the microscopic origin of the THz dielectric response of the simplest alcohol, methanol, we resonantly excite this liquid with an intense THz electric-field pulse and monitor the relaxation of the induced optical birefringence. We find a unipolar THz-Kerr-effect signal which, in contrast to aprotic polar liquids, shows a weak coupling between the THz electric field and the permanent molecular dipole moment of the liquid. We assign this weak coupling to the restricted translational rather than rotational nature of the excited mode. Our approach opens a new avenue to the assignment of the dielectric spectrum of liquids to a microscopic origin.