The Nature of the Dielectric Response of Methanol Revealed by the Terahertz Kerr Effect,The Journal of Physical Chemistry Letters

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The Nature of the Dielectric Response of Methanol Revealed by the Terahertz Kerr Effect
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2018-02-23 00:00:00 , DOI: 10.1021/acs.jpclett.7b03281
Tobias Kampfrath _{1,

2} , R. Kramer Campen ₁ , Martin Wolf ₁ , Mohsen Sajadi ₁

Affiliation

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.

中文翻译：

太赫兹克尔效应揭示的甲醇介电响应的性质

太赫兹（THz）和次THz频率范围内的液体介电响应是由低能集体分子运动引起的，该运动通常受分子间相互作用的强烈影响。为了阐明最简单的醇（甲醇）的THz介电响应的微观起源，我们用强烈的THz电场脉冲共振激发了这种液体，并监测了诱导的光学双折射的弛豫。我们发现一个单极的THz-Kerr效应信号，与非质子极性液体相反，它显示了THz电场与液体的永久分子偶极矩之间的弱耦合。我们将此弱耦合分配给受激模式的受限制的平移而不是旋转性质。

更新日期：2018-02-23

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