Spectroscopic analysis of molecular motion modes  revealed by the terahertz Kerr effect

Guang Lu; Yong Tan; Hang Zhao; Yuejin Zhao

doi:10.1117/12.2687481

26 November 2023 Spectroscopic analysis of molecular motion modes revealed by the terahertz Kerr effect

Guang Lu, Yong Tan, Hang Zhao, Yuejin Zhao

Proceedings Volume 12776, Infrared, Millimeter-Wave, and Terahertz Technologies X; 1277611 (2023) https://doi.org/10.1117/12.2687481
Event: SPIE/COS Photonics Asia, 2023, Beijing, China

Conference Poster

Abstract

The novel time-resolved terahertz (THz) Kerr effect (TKE) spectroscopy is a powerful tool for the study of the intermolecular structure and low-frequency molecular dynamics of liquid water. Here, we further observe the Kerr effect response in free-flowing aqueous membranes induced by strong ultra-broadband THz pulses. The intermolecular hydrogen bonding dynamics of a series of ionic aqueous solutions were investigated and a significantly enhanced Kerr effect response associated with polarization anisotropy was obtained. We analyze the spectra of the obtained Kerr effect responses of water and aqueous solutions and focus on the vibrational features of multiple molecular modes on the spectra. We decompose the molecular responses of ionic aqueous solutions into Debye relaxation related to molecular reorientation motions, intermolecular hydrogen bond bending and stretching modes associated with restricted translational motions, and specific ion-water hydrogen bond vibrational modes. The effects of different ions and vibrational modes on the hydrogen bonding network excited by the THz electric field and their corresponding manifestations in the spectrum are analyzed and compared. Our measurements positively affect the deeper understanding of intermolecular dynamics in liquid media.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Guang Lu, Yong Tan, Hang Zhao, and Yuejin Zhao "Spectroscopic analysis of molecular motion modes revealed by the terahertz Kerr effect", Proc. SPIE 12776, Infrared, Millimeter-Wave, and Terahertz Technologies X, 1277611 (26 November 2023); https://doi.org/10.1117/12.2687481

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