What is it about?
Stimulated Raman scattering (SRS) spectroscopy as a powerful tool for uncovering the structure, composition and dynamic behavior of matter has been applied to understand the micro-dynamics of water-hydrogen peroxide mixture under the breakdown induced by a strong focused laser pulse. It has been observed that SRS peak intensities of O-O and O-H bond stretches are competitive and they are up to the coupling direction of the excess electrons from water and hydrogen peroxide. Notably, a high-order (5th order) SRS peak originating from H2O2 is detected due to the Raman-active enhancement, which is caused by surplus electrons and the amplification of vibration energy.
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Why is it important?
Our experiments provide the way how to regulate O-O and O-H stimulated Raman scattering peaks in water-hydrogen peroxide mixture solution with excess electrons produced by laser-induced breakdown. By controlling the laser power to generate the excess electrons, the competitive, different-order SRS peaks can be examined. This holds the potential for advancing multi-wavelength selective regulation in terms of the component contributions.
Perspectives
This paper just makes people think about the working mechanism of chemical bonds in common water-hydrogen peroxide mixture under strong light illumination, such as laser.
Cunming Liu
Argonne National Laboratory
Read the Original
This page is a summary of: Regulation of O–H and O–O stimulated Raman scattering peaks in H2O–H2O2 solution by excess electrons, Applied Physics Letters, June 2023, American Institute of Physics,
DOI: 10.1063/5.0158424.
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