Optical constants of ice Ih crystal at terahertz frequencies

Zhang, Chun; Lee, Kwang-Su; Zhang, X.-C.; Wei, Xing; Shen, Y. R.

doi:10.1063/1.1386401

Cited by 48 publications

(56 citation statements)

References 16 publications

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“…The frequency dependence of the real part of the dielectric constants ε [14]. Our experimental data shows good agreement with the reported data at the same temperature.…”

Section: Dielectric Parameters Of Water Ice and Heavy Water Icesupporting

confidence: 80%

“…THz-TDS is a convenient analytical technique that allows one to determine the optical constants and absorption coefficients of samples without using the Kramers-Kronig relationship [35]. Several studies on water and ice using THz spectroscopy have been reported so far [14,36]. However, the temperature range used in these studies was very limited.…”

Section: Introductionmentioning

confidence: 99%

“…The dielectric constants, which are fundamental parameters of a material, provide information on the water reorientation and proton disorder of the crystalline lattice of a hydrogen-bonded material. Although the dielectric parameters of ice have been reported in detail for a wide frequency and temperature range [1,[10][11][12][13][14][15][16][17][18][19][20][21], there are few such studies for gas hydrates. Davidson et al provided a systematic discussion of the relaxation and reorientation of water molecules of gas hydrates using dielectric parameters [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

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Research on Hydrogen-Bonded Materials Using Terahertz Technology

Takeya¹,

Kawase²

2017

Terahertz Spectroscopy - A Cutting Edge Technology

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We measured terahertz (THz) characterization of hydrogen-bonded materials using THz time domain spectroscopy (TDS) with a gas-cooling cryostat. The temperature and frequency dependencies of the complex dielectric constants of icy materials were measured over a wide temperature range. We checked the dielectric parameters of ices and gas hydrates using a mathematical model. Ice exhibits increasing absorption with frequency in the THz range because of the low-frequency tail of the infrared-absorption band. This behavior is also observed in gas hydrates. The parameters describing the frequency dependence of ε″ are treated as functions of temperature. From the THz spectroscopy on gas hydrates, we showed that the dielectric constants of the gas hydrates in the THz range can be analyzed using methods for ice. The complex dielectric constants in the THz range contribute to the infrared polarization and phonon absorption of the water molecules on the hydrogen-bonding matrices, so we suggest that THz-TDS is useful for physical and chemical studies of gas hydrates.

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“…The frequency dependence of the real part of the dielectric constants ε [14]. Our experimental data shows good agreement with the reported data at the same temperature.…”

Section: Dielectric Parameters Of Water Ice and Heavy Water Icesupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Research on Hydrogen-Bonded Materials Using Terahertz Technology

Takeya¹,

Kawase²

2017

Terahertz Spectroscopy - A Cutting Edge Technology

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“…Ice in DNA solutions has no resonance in the THz range 42 but produces a background that is predicted to have higher absorption than methylation resonance peaks. The amplitude of the absorption peaks in the nucleoside is less than 10 cm −1 , whereas ice exhibits absorption coefficients of a few tens cm −1 in the THz range 43 . The frozen samples were attached to a quartz window and maintained at a constant temperature (253 K) during the THz-TDS measurement process.…”

Section: Looking For Thz Molecular Resonance In Cancer Dnasmentioning

confidence: 99%

Terahertz molecular resonance of cancer DNA

Cheon

Son

2017

2017 42nd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)

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Carcinogenesis involves the chemical and structural alteration of biomolecules in cells. Aberrant methylation of DNA is a well-known carcinogenic mechanism and a common chemical modification of DNA. Terahertz waves can directly observe changes in DNA because the characteristic energies lie in the same frequency region. In addition, terahertz energy levels are not high enough to damage DNA by ionization. Here, we present terahertz molecular resonance fingerprints of DNA methylation in cancer DNA. Methylated cytidine, a nucleoside, has terahertz characteristic energies that give rise to the molecular resonance of methylation in DNA. Molecular resonance is monitored in aqueous solutions of genomic DNA from cancer cell lines using a terahertz time-domain spectroscopic technique. Resonance signals can be quantified to identify the types of cancer cells with a certain degree of DNA methylation. These measurements reveal the existence of molecular resonance fingerprints of cancer DNAs in the terahertz region, which can be utilized for the early diagnosis of cancer cells at the molecular level.The early detection of cancer is among the most important issues in medical diagnosis because it provides a chance to treat cancer before it grows too large and spreads to other organs 1-3 . Many techniques from a variety of fields have been attempted to achieve early cancer detection, including optical techniques. Of these, terahertz (THz) spectroscopy shows high sensitivity for chemical changes in biological molecules without causing ionization, owing to its low photon energy [4][5][6][7][8] . THz cancer diagnostics have attracted much attention, in particular because the THz technique can distinguish normal tissue from cancer tissues via spectroscopic imaging and has been further improved with nanoparticle contrast agents to achieve higher contrast 9-13 . However, this method is still insufficient for cancer diagnostics because it provides only nonspecific information (location, size, and demarcation) but no molecular or biological information regarding the cancer 1,[14][15][16] . This issue is also present in current medical imaging techniques such as magnetic resonance imaging (MRI), computed tomography (CT) and positron emission tomography (PET). These techniques require contrast agents to enhance detection and cannot provide tumour-specific information. Cancer biomarkers play a significant role in providing molecular information for the specific diagnosis of early-stage cancers 17,18 . In particular, carcinogenesis causes chemical and structural alterations to the DNA in cells, and detecting such changes would be important in identifying cancers. Several groups have attempted to characterize the spectral properties of DNA in the THz frequency range.B. M. Fischer et. al. reported on the THz resonance features of DNA components (nucleobases and deoxynucleosides) using a THz spectroscopic system. M. Brucherseifer et al. measured the differences in the transmission changes and refractive indices of single-and double-stranded DN...

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“…8 THz waves propagate further in aqueous ice because there are fewer molecular vibration modes. The smooth spectrum of ice crystals in the 0.25 -1.0 THz range measured with THz-TDS was reported by Zhang et al 9 Using inelastic neutron scattering, researchers observed the density of the vibration states of crystalline and amorphous ice, which contribute to the translational, librational and internal vibrational modes, from 0.8 -31. 4 THz with a frequency resolution of 0.5 -2.0 THz.…”

Section: Introductionmentioning

confidence: 99%

Detecting a Sodium Chloride Ion Pair in Ice Using Terahertz Time-domain Spectroscopy

2007

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The hydrogen bond resonance of a sodium chloride (NaCl) ion pair trapped in aqueous ice has been observed by transmission terahertz time-domain spectroscopy. The absorption peak of a sodium chloride ion pair in ice is 1.65 THz at 83 K. By investigating the interaction of the cation and anion with other chemical compounds, we deduce that the absorption peak originates from the hydrogen bond resonance of sodium chloride and water molecules. The charge redistribution that occurs when other ion pairs are added to aqueous salt solution changes the absorption spectrum. Furthermore, the results also indicate that simple molecules such as sodium halides have fingerprints in the terahertz region when the ions are trapped in ice. NaCl ion pairs in seawater and in Ringer's solution were examined.

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Optical constants of ice Ih crystal at terahertz frequencies

Cited by 48 publications

References 16 publications

Research on Hydrogen-Bonded Materials Using Terahertz Technology

Research on Hydrogen-Bonded Materials Using Terahertz Technology

Terahertz molecular resonance of cancer DNA

Detecting a Sodium Chloride Ion Pair in Ice Using Terahertz Time-domain Spectroscopy

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