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Related Experiment Video

Updated: Jul 18, 2025

Non-equilibrium Microwave Plasma for Efficient High Temperature Chemistry
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Laser ablation plasma expansion using microwaves.

Yuji Ikeda1, Joey Kim Soriano2, Hironori Ohba3,4

  • 1i-Lab., Inc., #213 KIBC Bldg., 5-5-2 Minatojima-Minami, Chuo, Kobe, 650-0047, Japan. yuji@i-lab.net.

Scientific Reports
|August 25, 2023
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Summary

Microwaves significantly boost laser ablation plasma, increasing emission and volume while lowering temperature. This method enhances laser-induced breakdown spectroscopy and reduces hazardous fumes, aiding in nuclear debris cleanup.

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Area of Science:

  • Plasma Physics
  • Materials Science

Background:

  • Laser ablation produces transient plasma for material analysis.
  • Controlling plasma properties like emission and volume is crucial for applications.
  • Transient plasmas often have high temperatures, limiting some applications and safety.

Purpose of the Study:

  • To investigate the effect of microwaves on laser ablation plasma of a Zr target.
  • To assess the potential of microwaves in sustaining and enhancing plasma expansion.
  • To evaluate the impact on plasma temperature, emission intensity, and spatial volume.

Main Methods:

  • Utilizing microwaves to interact with transient laser ablation plasma.
  • Measuring plasma emission intensity and spatial volume.
  • Monitoring plasma temperature changes using spectroscopic methods.

Main Results:

  • Microwaves increased plasma emission intensity by 2-3 orders of magnitude.
  • Plasma spatial volume expanded by 18 times.
  • Plasma temperature decreased from 10,000 K to approximately 3000 K.
  • Microwave application enabled sustained plasma in air, indicating non-equilibrium conditions.

Conclusions:

  • Microwaves effectively enhance laser ablation plasma emission and volume at lower temperatures.
  • This technique improves laser-induced breakdown spectroscopy performance and safety.
  • Microwaves can mitigate toxic fume and dust generation during ablation, beneficial for hazardous material handling.