Optical Constants of Water in the 200-nm to 200-μm Wavelength Region

Hale, George M.; Querry, Marvin R.

doi:10.1364/ao.12.000555

Cited by 4,018 publications

(2,279 citation statements)

References 36 publications

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“…1. The broadband complex dielectric constants obtained were in good agreement with previous infrared spectroscopy results reported by Zelsman (62) and Hale and Querry (63), providing credibility for our spectroscopic measurements and K-K transform. As seen in the inset of Fig.…”

Section: Data Acquisitionsupporting

confidence: 90%

“…As seen in the inset of Fig. 1, several noticeable resonant peaks are identified in the imaginary part, such as broad intermolecular bands around 5 and 18 THz (62) and relatively sharp intramolecular and overtone/combination bands in the MIR and NIR regions (63). Broader features of intermolecular bands in the THz and FIR regions reflect the heterogeneous structure of liquid water.…”

Section: Data Acquisitionmentioning

confidence: 97%

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Hydrogen Bond Network of Water around Protein Investigated with Terahertz and Infrared Spectroscopy

Shiraga

Ogawa

Kondo

2016

Biophysical Journal

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The dynamical and structural properties of water at protein interfaces were characterized on the basis of the broadband complex dielectric constant (0.25 to 400 THz) of albumin aqueous solutions. Our analysis of the dielectric responses between 0.25 and 12 THz first revealed hydration water with retarded reorientational dynamics extending~8.5 Å (corresponding to three to four layers) out from the albumin surface. Second, the number of nonhydrogen-bonded water was decreased in the presence of the albumin solute, indicating protein inhibits the fragmentation of the water hydrogen-bond network. Finally, water molecules at the albumin interface were found to form a distorted hydrogen-bond structure due to topological and energetic disorder of the protein surface. In addition, the intramolecular O-H stretching vibration of water (~100 THz), which is sensitive to hydrogen-bond environment, pointed to a trend that hydration water has a larger population of strongly hydrogen-bonded water molecules compared with that of bulk water. From these experimental results, we concluded that the ''strengthened'' water hydrogen bonds at the protein interface dynamically slow down the reorientational motion of water and form the less-defective hydrogen-bond network by inhibiting the fragmentation of water-water hydrogen bonds. Nevertheless, such a strengthened water hydrogen-bond network is composed of heterogeneous hydrogen-bond distances and angles, and thus characterized as structurally ''distorted.''

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Section: Data Acquisitionsupporting

confidence: 90%

Section: Data Acquisitionmentioning

confidence: 97%

Hydrogen Bond Network of Water around Protein Investigated with Terahertz and Infrared Spectroscopy

Shiraga

Ogawa

Kondo

2016

Biophysical Journal

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“…3 A value of n = 1.33 was used as the refractive index of the electrolyte, regardless of wavelength. 4 Illumination intensities identical to those used experimentally (see Section S2) were used in the simulations. Simulations of the film morphology utilized the peak intensity wavelength of the experimental sources described in Section S2.…”

Section: Simulation Of Film Morphologymentioning

confidence: 99%

Morphological Expression of the Coherence and Relative Phase of Optical Inputs to the Photoelectrodeposition of Nanopatterned Se–Te Films

et al. 2016

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Highly anisotropic and ordered nanoscale lamellar morphologies can be spontaneously generated over macroscopic areas, without the use of a photomask or any templating agents, via the photoelectrodeposition of Se–Te alloy films. To form such structures, the light source can be a single, linearly polarized light source that need not necessarily be highly coherent. In this work, the variation in the morphologies produced by this deposition process was evaluated in response to differences in the coherence and relative phase between multiple simultaneous linearly polarized illumination inputs. Specifically, the morphologies of photoelectrodeposits were evaluated when two tandem same-wavelength sources with discrete linear polarizations, both either mutually incoherent or mutually coherent (with defined phase differences), were used. Additionally, morphologies were simulated via computer modeling of the interfacial light scattering and absorption during the photoelectrochemical growth process. The morphologies that were generated using two coherent, in-phase sources were equivalent to those generated using only a single source. In contrast, the use of two coherent, out-of-phase sources produced a range of morphological patterns. For small out-of-phase addition of orthogonal polarization components, lamellar-type patterns were observed. When fully out-of-phase orthogonal sources (circular polarization) were used, an isotropic, mesh-type pattern was instead generated, similar to that observed when unpolarized illumination was utilized. In intermediate cases, anisotropic lamellar-type patterns were superimposed on the isotropic mesh-type patterns, and the relative height between the two structures scaled with the amount of out-of-phase addition of the orthogonal polarization components. Similar results were obtained when two incoherent sources were utilized. In every case, the long axis of the lamellar-type morphology component aligned parallel to the intensity-weighted average polarization orientation. The observations consistently agreed with computer simulations, indicating that the observed morphologies were fully determined by the nature of the illumination utilized during the growth process. The collective data thus indicated that the photoelectrodeposition process exhibits sensitivity toward the coherency, relative phase, and polarization orientations of all optical inputs and that this sensitivity is physically expressed in the morphology of the deposit.

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“…*>6 *m; integration over * in (3) was performed with a Lobatto quadrature scheme (Wiscombe, 1977). Mie intensity functions were computed with a program by Wiscombe (1980); complex refractive indexes of liquid water were taken from Hale and Querry (1973).…”

Section: Computationsmentioning

confidence: 99%

Phase Function Mean Properties at Visible and Infrared Wavelengths within a Sample of 239 Fog Spectra

Tonna¹,

Tomasi²

1992

Journal of the Meteorological Society of Japan

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The mean characteristics of the phase function and of the coefficients of its Legendre series expansion were studied within a sample of 239 observed fog droplet size spectra, by computing their mean value, dispersion coefficient, skewness and kurtosis, at 86 wavelengths in the *=0.35-90 *m spectral interval. The results showed that the mean spectral behavior of the above quantities retains all the features pertaining to single spectra, and that the values of the optical quantities obtained for the different spectra are widely dispersed about their mean values. In particular, the dispersion for the phase function, at visible wavelengths, has a minimum close to zero (disp=l.3 %) around 40*, surrounded by a wide interval (15-55*) of low dispersion; for the asymmetry parameter the dispersion increases with wavelength from 1.7 % at *=0.35 im *p to 48 % at *=90 *m. The data produced can serve as reference values for both experimental and theoretical needs.

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Optical Constants of Water in the 200-nm to 200-μm Wavelength Region

Cited by 4,018 publications

References 36 publications

Hydrogen Bond Network of Water around Protein Investigated with Terahertz and Infrared Spectroscopy

Hydrogen Bond Network of Water around Protein Investigated with Terahertz and Infrared Spectroscopy

Morphological Expression of the Coherence and Relative Phase of Optical Inputs to the Photoelectrodeposition of Nanopatterned Se–Te Films

Phase Function Mean Properties at Visible and Infrared Wavelengths within a Sample of 239 Fog Spectra

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