Dielectric spectra of liquid water: Ultrabroadband modeling and interpretation

Волков, А. А.; Chuchupal, S. V.

doi:10.1016/j.molliq.2022.120044

Cited by 5 publications

(7 citation statements)

References 109 publications

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“…In Ref. [ 27 ], we described it analytically by a set of strongly damped oscillators, arranged in a pyramid and interconnected. We interpreted the IR active pyramid as a fingerprint of the oscillatory motion of nested charged molecular structures.…”

Section: Resultsmentioning

confidence: 99%

“…Ref. [ 27 ] on this issue) demonstrates at the same time, a rather simple and physically clear fact, namely the presence of a local energy-saturated oscillator in water which allows simple parametrization. Thus, the known spectral peak at 180 cm −1 (5 THz) assumes a worthy place in the problem of its application to thermodynamics.…”

Section: Methodsmentioning

confidence: 99%

“…The 5-THz oscillation is presented as a local resonant one, similar to those known in solid state physics (excitons, polarons) [ 50 ]. The localization time (ion life), according to our data, is on the scale of picoseconds [ 27 ].…”

Section: Methodsmentioning

confidence: 99%

“…With this approach, we attempted to consider the thermodynamics of liquid water within the framework of an ion–molecular model inspired by the panoramic dielectric spectra of water [ 27 ]. A specific effect taken from dielectric spectroscopy is introduced into the model—an energy-enriched oscillator at 5 THz.…”

Section: Methodsmentioning

confidence: 99%

“… The model spectral pyramid of the dielectric response of liquid water (see also Figure 10 in Ref. [ 27 ]) superimposed on reference data obtained from Ref. [ 28 ].…”

Section: Figurementioning

confidence: 99%

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Isochores and Heat Capacity of Liquid Water in Terms of the Ion–Molecular Model

Волков

Chuchupal

2023

IJMS

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Thermodynamics of liquid water in terms of a non-standard approach—the ion–molecular model—is considered. Water is represented as a dense gas of neutral H2O molecules and single charged H3O+ and OH− ions. The molecules and ions perform thermal collisional motion and interconvert due to ion exchange. The energy-rich process—vibrations of an ion in a hydration shell of molecular dipoles—well known to spectroscopists with its dielectric response at 180 cm−1 (5 THz), is suggested to be key for water dynamics. Taking into account this ion–molecular oscillator, we compose an equation of state of liquid water to obtain analytical expressions for the isochores and heat capacity.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“… The model spectral pyramid of the dielectric response of liquid water (see also Figure 10 in Ref. [ 27 ]) superimposed on reference data obtained from Ref. [ 28 ].…”

Section: Figurementioning

confidence: 99%

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Isochores and Heat Capacity of Liquid Water in Terms of the Ion–Molecular Model

Волков

Chuchupal

2023

IJMS

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Analysis of terahertz spectra of water and NaCl solutions obtained in attenuated total reflectance configuration

Mendoz Galván,

Justo Guerrero,

Strupiechonski

2023

Terahertz Emitters, Receivers, and Applications XIV

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This research addresses the complex issues encountered when studying biological and chemical samples in the terahertz (THz) range, mainly due to water's high absorption properties. Using THz-Attenuated Total Reflectance (ATR) spectroscopy, we investigate water and NaCl solutions and provide both experimental data and a comprehensive interpretation of the optical phenomena observed. . Our focus lies in understanding the changes in ATR responses in the THz range for solutions in both bulk and thin film forms, using a non-linear regression analysis of effective optical functions. Moving beyond the traditional low-absorption limit, our study highlights the need for precise equations. We further reveal the significant impact on the optical constants n and k of solutions when NaCl is introduced, offering valuable insights for interpreting spectral data for lossy samples using ATR. Our work seeks to deepen understanding and encourage further research of biological and chemical solutions at THz frequencies.

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Terahertz spectroscopy of thick and diluted water solutions

Novelli

2024

Opt. Express

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While bright terahertz sources are used to perform nonlinear experiments, they can be advantageous for high-precision linear measurements of opaque samples. By placing the sample away from the focus, nonlinearities can be suppressed, and sizeable amounts of transmitted radiation detected. Here, this approach is demonstrated for a 0.5 mm thick layer of liquid water in a static sample holder. Variations of the index of refraction as small as (7 ± 2) · 10−4 were detected at 0.58 THz for an aqueous salt solution containing ten millimoles of sodium chloride. To my knowledge, this precision is unprecedented in time-domain spectroscopy studies of diluted aqueous systems or other optically thick and opaque materials.

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Dielectric spectra of liquid water: Ultrabroadband modeling and interpretation

Cited by 5 publications

References 109 publications

Isochores and Heat Capacity of Liquid Water in Terms of the Ion–Molecular Model

Isochores and Heat Capacity of Liquid Water in Terms of the Ion–Molecular Model

Analysis of terahertz spectra of water and NaCl solutions obtained in attenuated total reflectance configuration

Terahertz spectroscopy of thick and diluted water solutions

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