The influence of magnetic field on the echo-like free induction decay in NO₂

Highlights: • The effect of magnetic field on the terahertz free induction in NO₂ was studied. • The magnetic field reduces the integrated intensity of the FID signal. • A large rotation angle of the polarization plane was observed at the magnetic field of 120 G. The effect of magnetic field on the free induction in NO₂ was studied. The experiments were performed using the Free Electron Laser in the terahertz frequency domain. A magnetic field affects the free induction decay in two ways. First, it reduces the integral intensity of the free induction radiation. Second, application of the magnetic field results in the rotation of the polarization of the free induction radiation. Both effects were observed experimentally as well as simulated numerically using a theoretical model. A large angle of the polarization plane rotation was observed upon application of magnetic field of 120 G.