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Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems
Published on: February 10, 2020
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Time-resolved THz Stark spectroscopy of molecules in solution
Bong Joo Kang1,2, Egmont J Rohwer1, David Rohrbach1
1Institute of Applied Physics, University of Bern, Bern, Switzerland.
Nature Communications
|May 17, 2024
Summary
This study introduces time-resolved terahertz (THz) Stark spectroscopy, enabling molecular studies in liquid solutions. This breakthrough overcomes previous limitations, allowing analysis of molecular dynamics at ambient conditions.
Area of Science:
- Physical Chemistry
- Molecular Spectroscopy
- Terahertz Science
Background:
- Stark spectroscopy traditionally faced challenges in liquid solutions due to overwhelming background signals from molecular orientation.
- Previous methods required freezing solvents to immobilize molecules, preventing studies in liquid environments at ambient conditions.
Purpose of the Study:
- To develop a novel method for performing Stark spectroscopy on molecules in liquid solutions.
- To enable dynamic studies of molecular vibrations and rotations in various solvents and temperatures.
Main Methods:
- Utilizing intense single-cycle terahertz (THz) pulses as the electric field source for time-resolved measurements.
- Employing THz frequencies where molecular dipole moments do not have sufficient time to orient.
Main Results:
- Demonstrated the feasibility of time-resolved THz Stark spectroscopy in both non-polar and polar solvents.
- Verified the technique's accuracy by comparing results with conventional Stark spectroscopy and first-principle calculations for selected molecular systems.
Conclusions:
- THz Stark spectroscopy overcomes the limitations of traditional methods, opening new avenues for studying molecular dynamics in liquids.
- This technique allows for unprecedented investigations of molecular behavior in solution across a range of temperatures and solvent types.
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