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Updated: May 9, 2026

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
Published on: February 4, 2017
Field-free orientation by a single-cycle THz pulse: the NaI and IBr molecules
Ze-Yu Zhao1, Yong-Chang Han, Yin Huang
1School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China.
Abstract:
The field-free orientation induced by a single-cycle terahertz (THz) laser pulse is studied for two "heavy" molecules, NaI and IBr. Two methods are used and compared in the calculations: One is to solve the exact time-dependent Schrödinger equation (ETDSE) considering the full-rovibrational degrees of freedom, and the other is to invoke the rigid-rotor approximation (RRA). Calculations are performed for the central frequency varying from 0.05 to 1.0 THz and for the peak intensity taken to be 5 × 10(7), 2 × 10(8), and 5 × 10(8) W∕cm(2), respectively. The degree of field-free orientation,
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