The resonant heating of heavy water solutions under the terahertz pulse irradiation

- A resonant heating of heavy water solution under terahertz pulse irradiation is observed.
- The resonant frequencies exhibit a large difference between heavy water and normal water.
- Several rotational collective modes are addressed as the mechanisms of the resonant phenomena.
- The specific location of the resonant peak is dependent on the intensity of the terahertz pulse.
- The shifting of peak location stems from different efficiency of each resonant mode under different pulse intensities.

The heating effect of terahertz pulse with various frequencies and intensities on the heavy water solution is investigated using the molecular dynamics simulation. Resonant absorptions are found for both heavy water and light water, but at a different resonant frequency which is about 16THz for heavy water and 21THz for light water. This resonant phenomenon can be explained perfectly by the collective rotational modes that may release water molecules from hydrogen bonding. The findings not only illustrate the heating mechanism of heavy water solution under the terahertz pulse irradiation, but also demonstrate a novel difference between light water and heavy water that could have potential applications.