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The nature of light has been a subject of inquiry since antiquity. In the seventeenth century, Isaac Newton performed experiments with lenses and prisms and was able to demonstrate that white light consists of the individual colors of the rainbow combined together. Newton explained his optics findings in terms of a "corpuscular" view of light, in which light was composed of streams of extremely tiny particles traveling at high speeds according to Newton's laws of motion.
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Enhanced Stimulated Raman Scattering by a Pressure-Controlled Shock Wave in Liquid Water.

Fabing Li1, Ying Wang1, Zhanlong Li1

  • 1Coherent Light and Atomic and Molecular Spectroscopy Laboratory, College of Physics, Jilin University, Changchun 130012, China.

The Journal of Physical Chemistry Letters
|August 8, 2019
PubMed
Summary
This summary is machine-generated.

High pressure significantly enhances stimulated Raman scattering (SRS) in water, shifting spectral peaks and indicating the formation of ice-like structures due to shock wave effects.

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Area of Science:

  • Spectroscopy
  • Condensed Matter Physics
  • Physical Chemistry

Background:

  • Stimulated Raman scattering (SRS) is a sensitive probe of molecular vibrations.
  • Understanding water's behavior under high pressure is crucial for various scientific fields.
  • Previous studies have explored water under pressure, but SRS spectral changes require further investigation.

Purpose of the Study:

  • To investigate the effect of high pressure on stimulated Raman scattering (SRS) spectra of liquid water.
  • To analyze spectral shifts and new peak formations under varying pressures.
  • To elucidate the underlying mechanisms responsible for pressure-induced SRS enhancement.

Main Methods:

  • Utilizing a Nd:YAG laser to induce stimulated Raman scattering in liquid water.
  • Conducting experiments at atmospheric and elevated pressures.
  • Analyzing SRS spectra in both forward and backward scattering directions.

Main Results:

  • Observed distinct spectral features for liquid water at high pressures compared to atmospheric pressure.
  • Noted a low-frequency shift in the main SRS peak (around 3400 cm⁻¹) under high pressure.
  • Identified a new spectral peak at lower frequencies, indicative of strong hydrogen bonds.
  • Detected a distinct peak around 3140 cm⁻¹ in the backward direction at 400 MPa, suggesting an ice-like structure.
  • Found that normalized SRS intensity increased with pressure, indicating significant enhancement.

Conclusions:

  • High pressure significantly enhances the stimulated Raman scattering of water molecules.
  • Pressure-induced spectral changes, including peak shifts and new peak formation, are linked to alterations in hydrogen bonding and structural ordering.
  • The observed enhancement is attributed to shock wave dynamics, characterized by long duration and reduced velocity.