Far-Ultraviolet Spectroscopy in the Solid and Liquid States: A Review

Ozaki, Yukihiro; Morisawa, Yusuke; Ikehata, Akifumi; Higashi, Noboru

doi:10.1366/11-06496

Cited by 72 publications

(74 citation statements)

References 87 publications

(311 reference statements)

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“…The peak of H 2 O 2 is not shown in the graph because it is outside the wavelength range of the spectrophotometers -it was measured to be at 160 nm. 47,48) In addition, our earlier reports have shown that plasma treatment also changes the O 2 concentration in DI water. 33,34,49) Therefore, in order to curve-fit the changes in O 2 concentration, we obtained the reference spectrum of O 2 in Fig.…”

Section: Rons Uv-vis Spectra Profilesmentioning

confidence: 87%

UV–vis spectroscopy study of plasma-activated water: Dependence of the chemical composition on plasma exposure time and treatment distance

Szili

Ogawa

et al. 2017

Jpn. J. Appl. Phys.

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Plasma-activated water (PAW) is receiving much attention in biomedical applications because of its reported potent bactericidal properties. Reactive oxygen and nitrogen species (RONS) that are generated in water upon plasma exposure are thought to be the key components in PAW that destroy bacterial and cancer cells. In addition to developing applications for PAW, it is also necessary to better understand the RONS chemistry in PAW in order to tailor PAW to achieve a specific biological response. With this in mind, we previously developed a UV-vis spectroscopy method using an automated curve fitting routine to quantify the changes in H 2 O 2 , NO 2 % , NO 3 % (the major long-lived RONS in PAW), and O 2 concentrations. A major advantage of UV-vis is that it can take multiple measurements during plasma activation. We used the UV-vis procedure to accurately quantify the changes in the concentrations of these RONS and O 2 in PAW. However, we have not yet provided an in-depth commentary of how we perform the curve fitting procedure or its implications. Therefore, in this study, we provide greater detail of how we use the curve fitting routine to derive the RONS and O 2 concentrations in PAW. PAW was generated by treatment with a helium plasma jet. In addition, we employ UV-vis to study how the plasma jet exposure time and treatment distance affect the RONS chemistry and amount of O 2 dissolved in PAW. We show that the plasma jet exposure time principally affects the total RONS concentration, but not the relative ratios of RONS, whereas the treatment distance affects both the total RONS concentration and the relative RONS concentrations.

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Section: Rons Uv-vis Spectra Profilesmentioning

confidence: 87%

UV–vis spectroscopy study of plasma-activated water: Dependence of the chemical composition on plasma exposure time and treatment distance

Szili

Ogawa

et al. 2017

Jpn. J. Appl. Phys.

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“…An absorption peak at 209.2 nm was detected for NaNO 2 and 201.4 nm for HNO 3 . A shoulder of a peak was detected for H 2 O 2 because the H 2 O 2 peak is expected to exist at a much shorter wavelength of 160 nm [27,28]. …”

Section: Uv Absorption Profiles Of Reference Solutionsmentioning

confidence: 99%

In-situ UV Absorption Spectroscopy for Monitoring Transport of Plasma Reactive Species through Agarose as Surrogate for Tissue

Szili

Gaur

et al. 2015

J. Photopol. Sci. Technol.

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We demonstrated the efficacy of using a simple experimental approach, involving UV absorption spectroscopy, to monitor the transport of reactive oxygen and nitrogen species (RONS) through an agarose film (as surrogate for real tissue) into deionized (DI) water. The experiment involved placing a 4 mm thick agarose film over a quartz cuvette filled with DI water. The agarose film was exposed to a non-thermal, He atmospheric-pressure plasma jet (APPJ) and the UV absorption of the DI water was recorded in real-time. Our results indicate an accumulation of RONS within the agarose film during APPJ exposure and a subsequent time-lapsed release of RONS into the DI water. Curve fitting of the UV spectra suggested the APPJ transported and / or generated at least four RONS (NaNO 2 , HNO 3 , H 2 O 2 and O 2 ) through the 4 mm thick agarose film. Our approach of analyzing the delivery depth of RONS through synthetic tissue targets might find use in the future development of APPJ medical therapies and for improving our understanding of APPJ interactions with soft tissue.

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“…(32) The areas investigated consist mainly of the Cretaceous sedimentary rocks of the Izumi Group, Cretaceous granitoids, Cretaceous felsic volcanoclastic rocks of the Arima-Ikuno Group, sandstone, mudstone, chert, limestone and basalts of the Japanese accretionary complex of the Tamba belt, sandstone, conglomerate, mudstone, and tuffs of the Miocene Kobe Group, and Plicocene to Pleistocene sand, gravel and clays of the Osaka Group. (1) A geological outline map of Hyogo Prefecture and the sampling points are shown in Figure 1. (32) …”

Section: Examples Of Usefulness Of Fuv Spectroscopy In Studies Of Watmentioning

confidence: 99%

“…(1) To overcome the difficulty in liquid-and solid-state FUV spectroscopy, we recently developed two kinds of FUV spectrometers with quite different designs. (31,43) One is a compact FUV spectrometer by which one can measure spectra of liquid samples down to 180 nm with nitrogen gas purge.…”

Section: Developments Of Two Kinds Of New Types Of Fuv Spectrometersmentioning

confidence: 99%

“…FUV spectra of liquid and solid samples have also been investigated for more than 40 years, although their examples are limited. (1) In 1971, Rudloff et al (9) tried to measure FUV spectra of solids in the region of 36-6 eV (34-207 nm) using synchrotron radiation from an electron storage ring. Jung and Gress (10,11) also used synchrotron radiation to observe transmission FUV spectra in the 115-207 nm (10.8-6.0 eV) region of CH 3 OH and C 2 H 5 OH in liquid phases.…”

Section: Introduction To Fuv Spectroscopymentioning

confidence: 99%

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Far‐Ultraviolet ( FUV ) Spectroscopy in the Solid and Liquid States, Principle, Instrumentation, and Application of

Morisawa

Goto

Ikehata

et al. 2013

Encyclopedia of Analytical Chemistry

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This article outlines recent progress in ultraviolet (UV) spectroscopy in the 140–280 nm region of solid and liquid phases. In this article, we refer to the 120–200 nm region as the far‐UV (FUV) region. The word ‘vacuum UV region’ is not appropriate any more at least for the 120–200 nm region because most of recent spectrometers used in this region do not have the vacuum evaporation system but have the nitrogen gas purged system. FUV spectroscopy is concerned with electronic transitions of a molecule, but the absorptivity is very high in the FUV region, and, therefore, this region has been employed to investigate mainly for the electronic states and structure of gas molecules. To observe spectra of solid samples in the FUV region, reflection spectroscopy has been used. However, for liquid samples, in general, it is very difficult to use either absorption spectroscopy or reflection spectroscopy. Accordingly, FUV spectroscopy for liquid samples has almost been an undeveloped research area. To solve these difficulties in FUV spectroscopy we have recently developed a totally new FUV spectrometer based on the attenuated total reflection (ATR) technique that enables us to measure spectra of liquid and solid samples in the 140–280 nm region. This spectrometer has opened up a new era of FUV spectroscopy. This article consists of seven parts: (i) introduction to FUV spectroscopy, (ii) characteristics and advantages of FUV spectroscopy for the study of liquids and solids, (iii) development of new FUV spectrometers, (iv) FUV studies of liquid water and aqueous solutions, (v) FUV spectra of organic molecules in the liquid states, (vi) potential applications of FUV spectroscopy in liquid and solid states, and (vii) time‐resolved (TR) FUV spectroscopy. This article demonstrates that FUV holds considerable promise not only in basic science but also in applications such as qualitative and quantitative analyses, on‐line monitoring, environmental geochemical analysis, and surface analysis.

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Far-Ultraviolet Spectroscopy in the Solid and Liquid States: A Review

Cited by 72 publications

References 87 publications

UV–vis spectroscopy study of plasma-activated water: Dependence of the chemical composition on plasma exposure time and treatment distance

UV–vis spectroscopy study of plasma-activated water: Dependence of the chemical composition on plasma exposure time and treatment distance

In-situ UV Absorption Spectroscopy for Monitoring Transport of Plasma Reactive Species through Agarose as Surrogate for Tissue

Far‐Ultraviolet ( FUV ) Spectroscopy in the Solid and Liquid States, Principle, Instrumentation, and Application of

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