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Shin-Ichi Ohkoshi1,2, Marie Yoshikiyo3, Asuka Namai3

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We identified a unique terahertz (THz) vibration for cesium (Cs) ions in metal-organic frameworks. This discovery enables non-contact THz-light detection of Cs ions in hazardous environments.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Spectroscopy

Background:

  • Terahertz (THz) technologies offer advanced capabilities for analysis and nondestructive sensing.
  • Heavy atoms in porous materials exhibit slow vibrations, resonating with low-frequency THz light.
  • Cyanide-bridged metal frameworks provide cages suitable for adsorbing ions like cesium (Cs).

Purpose of the Study:

  • To investigate the vibration mode of Cs ions within a cyanide-bridged metal framework.
  • To develop a THz-light-based method for detecting Cs ions.

Main Methods:

  • Utilizing first-principles phonon mode calculations.
  • Conducting terahertz time-domain spectroscopy (THz-TDS) measurements.

Main Results:

  • A distinct vibration mode for Cs ions was observed at 1.5 THz in a cyanide-bridged manganese-iron framework.
  • This Cs ion vibration is spectrally separated from other lattice vibrations.
  • A THz-light detection method for Cs ions was successfully developed.

Conclusions:

  • The unique vibrational signature of Cs ions in metal-organic frameworks can be exploited for sensing applications.
  • This THz-based method allows for non-contact detection of Cs ions.
  • The developed technique is valuable for monitoring Cs ions in dangerous or harmful environments.