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2017 ; 7
(1
): 8088
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Cesium ion detection by terahertz light
#MMPMID28839222
Ohkoshi SI
; Yoshikiyo M
; Namai A
; Nakagawa K
; Chiba K
; Fujiwara R
; Tokoro H
Sci Rep
2017[Aug]; 7
(1
): 8088
PMID28839222
show ga
Recent developments in terahertz technologies provide new tools for analysis,
inspection, and nondestructive sensing. If a heavy atom is encapsulated in a cage
of a porous material, the atom should vibrate slowly and resonate with a
low-frequency terahertz light. From this perspective, a cyanide-bridged metal
framework is a suitable system because it contains many cages that can adsorb Cs
ions. Herein we show the vibration mode of a Cs ion in a cage of a
cyanide-bridged metal framework. First-principles phonon mode calculations and
terahertz time-domain spectroscopy (THz-TDS) measurements indicate that the
vibration mode of a Cs ion in a cyanide-bridged manganese-iron framework is at
1.5?THz, which is significantly apart from other lattice vibrations. Taking
advantage of this feature, we develop a THz-light detection method for Cs ions,
which is useful for non-contact sensing of Cs ions in dangerous environments or
harmful circumstances.