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Готові списки джерел за темами / Ultraviolet and visible spectroscopy / Статті в журналах

Статті в журналах з теми "Ultraviolet and visible spectroscopy"

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Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 28 січня 2023

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1

Ginter, R. "Ultraviolet and visible spectroscopy." Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 53, no. 12 (October 1997): 2189. http://dx.doi.org/10.1016/s1386-1425(97)00090-5.

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2

Powell, D. "Visible and ultraviolet spectroscopy." Spectrochimica Acta Part A: Molecular Spectroscopy 45, no. 8 (January 1989): 879. http://dx.doi.org/10.1016/0584-8539(89)80227-2.

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3

Denny, R. C., R. Sinclair, and P. J. Worsfold. "Visible and ultraviolet spectroscopy1." Analytica Chimica Acta 208 (1988): 359–60. http://dx.doi.org/10.1016/s0003-2670(00)80775-8.

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4

Lai, Qi, Shifu Zhu, Xueping Luo, Min Zou, and Shuanghua Huang. "Ultraviolet-visible spectroscopy of graphene oxides." AIP Advances 2, no. 3 (September 2012): 032146. http://dx.doi.org/10.1063/1.4747817.

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5

Tomita, S., S. Hayashi, Y. Tsukuda, and M. Fujii. "Ultraviolet-visible absorption spectroscopy of carbon onions." Physics of the Solid State 44, no. 3 (March 2002): 450–53. http://dx.doi.org/10.1134/1.1462669.

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6

Zhou, Yan, Kia Boon Ng, Lan Cheng, Daniel N. Gresh, Robert W. Field, Jun Ye, and Eric A. Cornell. "Visible and ultraviolet laser spectroscopy of ThF." Journal of Molecular Spectroscopy 358 (April 2019): 1–16. http://dx.doi.org/10.1016/j.jms.2019.02.006.

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7

Martelo-Vidal, M. J., and M. Vázquez. "Evaluation of ultraviolet, visible, and near infrared spectroscopy for the analysis of wine compounds." Czech Journal of Food Sciences 32, No. 1 (February 18, 2014): 37–47. http://dx.doi.org/10.17221/167/2013-cjfs.

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Анотація:

Spectroscopy of UV-VIS-NIR combined with chemometric analyses was used as a non-destructive technique to build models for the quantitative characterisation of the main compounds of wine. The work in mixtures can give insight into how interferences affect the performance of calibrations in wines. Ethanol, glycerol, glucose, tartaric acid, malic acid, lactic acid, and acetic acid were evaluated as pure compounds and in mixtures. Different pre-treatments for the spectra and modelling strategies such as partial least squares (PLS) regression or Principal Component Regression (PCR) were evaluated. All pure compounds studied showed a good relationship between spectra and concentrations. However, interferences were observed in the mixtures and only good models for ethanol, tartaric acid, and malic acid were obtained. The best model was obtained in the NIR region for ethanol and in the UV region for tartaric acid and malic acid. The results indicate that NIR spectroscopy could be used as an alternative to conventional chemical methods for ethanol determination and UV spectroscopy for the determination of tartaric acid and malic acid.

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8

BROWN, CHRIS W. "ULTRAVIOLET, VISIBLE, and NEAR-INFRARED SPECTROPHOTOMETERS." Applied Spectroscopy Reviews 35, no. 3 (December 7, 2000): 151–73. http://dx.doi.org/10.1081/asr-100101223.

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9

Black, John H. "Ultraviolet, Visible, and Infrared Spectroscopy of Interstellar Molecules." Highlights of Astronomy 8 (1989): 331–38. http://dx.doi.org/10.1017/s1539299600007954.

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ABSTRACTAbsorption line spectroscopy in the ultraviolet, visible, and infrared regions can provide important probes of interstellar chemistry. Significant recent developments include the application of optical absorption line techniques to the study of thick molecular clouds and the improvements in infrared detectors that will eventually lead to effective interstellar spectroscopy in the infrared. Demands for basic molecular data will grow in scope and in level of precision.

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10

Obrzut, Jan, and Frank E. Karasz. "Ultraviolet and visible spectroscopy of poly(paraphenylene vinylene)." Journal of Chemical Physics 87, no. 4 (August 15, 1987): 2349–58. http://dx.doi.org/10.1063/1.453116.

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11

Milichovsky, Miloslav, and Svatava Milichovska. "Characterization of oxidized cellulose with ultraviolet–visible spectroscopy." Journal of Applied Polymer Science 107, no. 3 (2007): 2045–52. http://dx.doi.org/10.1002/app.27232.

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12

Li, Jingwei, Yifei Tong, Li Guan, Shaofeng Wu, and Dongbo Li. "A UV-visible absorption spectrum denoising method based on EEMD and an improved universal threshold filter." RSC Advances 8, no. 16 (2018): 8558–68. http://dx.doi.org/10.1039/c7ra13202f.

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13

Li, Fengxiao, Bin Tang, Mingfu Zhao, Xinyu Hu, Shenghui Shi, and Mi Zhou. "Research on Correction Method of Water Quality Ultraviolet-Visible Spectrum Data Based on Compressed Sensing." Journal of Spectroscopy 2021 (July 2, 2021): 1–7. http://dx.doi.org/10.1155/2021/6650630.

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Анотація:

The turbidity interference caused by suspended particles in water seriously affects the accuracy of ultraviolet-visible spectroscopy in detecting water quality chemical oxygen demand. Based on this, the application of ultraviolet-visible spectroscopy to detect water quality chemical oxygen demand usually requires physical and mathematical methods to correct the spectral baseline interference caused by turbidity. Because of the slow response speed and unstable compensation effect of traditional correction methods, this paper proposes to use a compressed sensing algorithm to perform baseline correction and achieve good results. In the experiment, we selected formazin turbidity solution and sodium oxalate standard solution and carried out the research on the algorithm of turbidity correction for detecting chemical oxygen demand of water quality by ultraviolet-visible spectroscopy. The experiment obtains the absorption spectra of different concentrations of formazine turbidity solutions and the same concentration of sodium oxalate with different turbidity standard solutions at 210∼845 nm and analyzes the nonlinear effect of absorbance on turbidity. This article uses standard solution experiments to explore the compressed sensing theory for turbidity correction, and through the correction of the absorption spectrum of the actual water sample, it verifies the feasibility of the compression theory for turbidity correction. The method effectively corrects the baseline shift or drift of the water quality ultraviolet-visible absorption spectrum caused by suspended particles, while retaining the absorption characteristics of the ultraviolet spectrum, and it can effectively improve the accuracy and accuracy of the ultraviolet-visible spectroscopy water quality chemical oxygen demand detection.

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14

Autrey, Tom, Nancy Foster, Derek Hopkins, and John Price. "Tunable ultraviolet visible photoacoustic detection." Analytica Chimica Acta 434, no. 2 (May 2001): 217–22. http://dx.doi.org/10.1016/s0003-2670(01)00834-0.

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15

Dang Thi Ngoc, Hoa, and Tu Nguyen Thi Thanh. "Synthesis of TiO2/g-C3N4 material for visble light driven photocatalytic degradation of methylene blue." Vietnam Journal of Catalysis and Adsorption 9, no. 3 (October 1, 2020): 21–26. http://dx.doi.org/10.51316/jca.2020.044.

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In this study, an efficient strategy for the synthesis of solvent titanium dioxide and titanium dioxide/graphitic carbon nitride (TiO2/g-C3N4) heterostructure photocatalyst was applied to fabricate a kind of visible-light-driven photocatalyst. The obtained samples were characterised by means of X-ray diffraction, infrared spectroscopy, ultraviolet–visible spectroscopy, ultraviolet-visible diffuse reflectance spectroscopy and photoluminescence. The heterostructure shows higher absorption edge towards harvesting more solar energy compared with pure TiO2 and pure g-C3N4 respectively. The photocatalytic behaviour under visible light and kinetics of the TiO2/g-C3N4 catalyst via methylene blue degradation were addressed. The results showed that the introduction of solvent titanium dioxide into g-C3N4 enhanced the photocatalytic activity in the visible light region. TiO2/g-C3N4 is potential visible light driven photocatalyst for the organic substances degradation in aqueous solutions.

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16

Martin, Paul. "Spectroscopy with a Light Optical Microscope." Microscopy Today 21, no. 1 (December 21, 2012): 22–26. http://dx.doi.org/10.1017/s1551929512001034.

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The microspectrophotometer can be described as a type of hyphenated instrument: it is a hybrid that combines the magnifying power of a light microscope with a UV-visible-NIR (ultraviolet–visible–near infrared) range spectrophotometer. These instruments are used to measure the molecular spectra from microscopic samples, from the deep ultraviolet to the near infrared region. Microspectrophotometers can be configured in many different ways and used to measure absorbance, reflectance, and even emission spectra, such as fluorescence, of sub-micron-sized sample areas. With the addition of specialized algorithms, the microspectrophotometer can also be used to measure the thickness of thin films or to act as a colorimeter for microscopic samples.

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17

Zhou, Zhi Wei, Ling Fang Qiu, Xiao Bin Qiu, and Shu Wang Duo. "The Synthesis, Characterization and Visible-Light Photodegradation Performance of Graphitic Carbon Nitride Coupling with CoAPO-5." Solid State Phenomena 281 (August 2018): 878–84. http://dx.doi.org/10.4028/www.scientific.net/ssp.281.878.

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In order to enhance hole/electron separation and charge transfer in photocatalysts, the heterostructured g-C3N4/CoAPO-5 hybrids materials were synthesized via a simple grinding method and were investigated using X-ray diffraction (XRD), fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). The optical properties of g-C3N4/CoAPO-5 hybrids materials were measured by ultraviolet-visible diffuse-reflectance spectroscopy (DRS), photoluminescence (PL) spectra and ultraviolet-visible absorption (UV-Vis) spectra. Under visible-light illumination, this work shows the heterogeneous g-C3N4/CoAPO-5 hybrids present a superior photocatalytic activity.

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18

Antoine, Rodolphe, and Philippe Dugourd. "Visible and ultraviolet spectroscopy of gas phase protein ions." Physical Chemistry Chemical Physics 13, no. 37 (2011): 16494. http://dx.doi.org/10.1039/c1cp21531k.

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19

Alam, Injamul, Kadambinee Sa, Sonali Das, BVRS Subramanyam, Manoranjan Mandal, Subhasri Subudhi, Santosini Patra, and Pitamber Mahanandia. "Study of electrical properties of a few layers of graphene sheets under Ultraviolet and Visible light irradation." International Journal of Innovative Research in Physics 2, no. 4 (July 5, 2021): 8–14. http://dx.doi.org/10.15864/ijiip.2402.

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Graphene is an excellent 2D material due to its exceptional electrical properties which can be potentially used in optoelectronic. In order to use graphene in optoelectronics, the electrical properties need to be tuned. To tune electrical properties, few-layer graphene sheets (FLGS) prepared by electrochemical method have been used. The prepared FLGS has been characterized by Field Emission Scanning Electron Microscope (FESEM), Transmission Electron Microscope (TEM), X-ray Diffraction (XRD), Ultraviolet-Visible Spectroscopy (UV-Vis), Fourier Transform Infrared (FTIR), and Raman Spectroscopy. The optimized FLGS by characterization has been employed to tune the electrical properties in the presence and absence of water drop under ultraviolet and visible light. The obtained current of FLGS thin film is ~ 0.8mA whereas; the measured current under ultraviolet light is ~ 1.7mA and under visible light ~ 1.07mA. However, it has been observed that the measured current has decreased to under ultraviolet ~ 0.645mA and visible light ~ 0.96mA in the presence of water drop in FLGS film. Therefore, the findings suggest that the electrical properties of FLGS can be tuned for various applications in optoelectronic devices.

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20

Abdrabou, Ahmed, Medhat Abdallah, Gilan M. Sultan, Mohamed Mostafa, Hind Bayoumi, Ramy Magdy, Mohamed A. Abd El Kader, et al. "Tutankhamun’s Polychrome Wooden Shawabtis: Preliminary Investigation for Pigments and Gilding Characterization and Indirect Dating of Previous Restorations by the Combined Use of Imaging and Spectroscopic Techniques." Open Archaeology 8, no. 1 (January 1, 2022): 30–54. http://dx.doi.org/10.1515/opar-2022-0223.

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Анотація:

Abstract To the best of our knowledge, such a detailed study on polychrome wooden shawabtis of King Tutankhamun (18th Dynasty in ancient Egypt) has not been reported in the literature, so the purpose of our study is to noninvasively identify the polychrome layers and previously applied materials for a number of wooden shawabtis that belong to King Tutankhamun through a protocol based on imaging techniques integrated with single-spot spectroscopic techniques. In the first step, imaging techniques (visible, ultraviolet induced visible luminescence, ultraviolet reflected, visible-induced infrared luminescence, infrared reflected, and infrared false color) and optical microscopy were applied to gather information and provide evidence on the distribution of original and previously applied materials on the polychrome surfaces. In the second step of our work, we analyzed the selected areas with single-spot analyses (handheld X-ray fluorescence spectroscopy and visible reflectance spectroscopy) and X-ray diffraction analysis. The materials of the previous restoration interventions were studied by Fourier transform infrared spectroscopy. The application of a protocol based on imaging techniques integrated with data obtained from single-spot spectroscopic techniques allowed the characterization of a remarkable number of polychrome layers and some previous restoration materials and mapping of their distribution on the original surface, which provides not only essential data for the follow-up treatment and conservation works but also offers important information for the study of polychrome wooden shawabtis of other periods in ancient Egypt.

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21

Oujja, M., M. Sanz, F. Agua, J. F. Conde, M. García-Heras, A. Dávila, P. Oñate, et al. "Multianalytical characterization of Late Roman glasses including nanosecond and femtosecond laser induced breakdown spectroscopy." Journal of Analytical Atomic Spectrometry 30, no. 7 (2015): 1590–99. http://dx.doi.org/10.1039/c5ja00150a.

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Анотація:

Nanosecond and femtosecond laser induced breakdown spectroscopy, X-ray fluorescence, ultraviolet-visible spectroscopy and laser induced fluorescence were combined for the analysis of Late Roman glasses.

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22

Sweedler, Jonathan V., Rafi D. Jalkian, Gary R. Sims, and M. Bonner Denton. "Crossed Interferometric Dispersive Spectroscopy." Applied Spectroscopy 44, no. 1 (January 1990): 14–20. http://dx.doi.org/10.1366/0003702904085967.

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A novel design is described which combines dispersive and interferometric spectrometric instrumentation for ultraviolet visible spectroscopy, offering significant advantages in comparison to conventional spectroscopic configurations. The optical system incorporates the triangular common-path interferometer with an additional cross-dispersive element, allowing spectra to be obtained in a format compatible with rectangular CTD array detectors. The use of a cross-dispersive optical element reduces the distributive multiplex effects of interferometry in a rugged, compact, optically simple system.

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23

Su, Yan, Shao You Liu, and Wen Hua Tang. "Photodecomposition of Methylene Blue by the S, Al Doped TiO₂ Mesoporous Materials." Advanced Materials Research 499 (April 2012): 58–62. http://dx.doi.org/10.4028/www.scientific.net/amr.499.58.

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Mesoporous sulfur, aluminium doped TiO2 materials (S-Al-TiO2, S-TiO2, Al-TiO2) have been synthesized by solid-state reaction route. The textural properties of the samples are monitored by the X-ray diffraction (XRD), Scanning electron micrography (SEM), Fourier transform infrared spectroscopy (FT-IR), ultraviolet visible light spectroscopy (UV-Vis) and N2-physisorption. Moreover, compared with the pure TiO2, the photodecomposition properties of methylene blue (MB) irradiated with ultraviolet and visible light are presented on the doped TiO2 materials. It is shown that TiO2 doped by sulfur and /or aluminium are mesoporous materials, and the S and Al enter into the crystal lattice of TiO2. At 298K, the rule of pseudo-first-order reaction and excellent visible light catalytic activity are obtained in the photodecomposition of MB on the S-Al-TiO2, S-TiO2, Al-TiO2 and pure TiO2 materials. Interestingly, the reaction rate constant of MB on the S-Al-TiO2 meso- porous nanomaterial is 11.40 times irradiated with the ultraviolet than that with visible light irradiation. But there is 1.42 times corresponding to the pure TiO2. Within 50 min, ultraviolet degradation rate of MB over the S-Al-TiO2 is 98.5%.

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24

Kobayashi, Takayoshi. "Development of Ultrashort Pulse Lasers for Ultrafast Spectroscopy." Photonics 5, no. 3 (July 20, 2018): 19. http://dx.doi.org/10.3390/photonics5030019.

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Principles and information obtained by ultrafast spectroscopy and scheme of optical parametric amplifier are discussed. Realization of ultrashort visible and ultraviolet lasers based on the parametric processes are discussed.

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25

Malik, Monu, Ka Ho Chan, and Gisele Azimi. "Quantification of nickel, cobalt, and manganese concentration using ultraviolet-visible spectroscopy." RSC Advances 11, no. 45 (2021): 28014–28. http://dx.doi.org/10.1039/d1ra03962h.

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26

Emphasis, Katherine M., Reynaldo M. Vequizo, Rolando T. Canditato, Majvell Kay G. Odarve, Filchito Renè G. Bagsican, Jess E. Gambe, Bianca Rae B. Sambo, and Arnold C. Alguno. "Optical Characteristics of Chemically Prepared ZnO Nanostructures on Silica Modified Polyaniline Nanocomposites." Applied Mechanics and Materials 548-549 (April 2014): 196–200. http://dx.doi.org/10.4028/www.scientific.net/amm.548-549.196.

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Zinc oxide (ZnO) on silica modified polyaniline (SM-PANI) was prepared via chemical bath deposition and in situ polymerization. The optical characteristics of the nanocomposites were investigated using ultraviolet-visible (UV-Vis) spectroscopy. The bands showed higher absorbance in the visible region. Fourier transform infrared (FTIR) spectroscopy revealed that there is an interaction between SM-PANI and ZnO.

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27

Kaczmarek, Katarzyna, Andrzej Leniart, Barbara Lapinska, Slawomira Skrzypek, and Monika Lukomska-Szymanska. "Selected Spectroscopic Techniques for Surface Analysis of Dental Materials: A Narrative Review." Materials 14, no. 10 (May 17, 2021): 2624. http://dx.doi.org/10.3390/ma14102624.

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Анотація:

The presented work focuses on the application of spectroscopic methods, such as Infrared Spectroscopy (IR), Fourier Transform Infrared Spectroscopy (FT-IR), Raman spectroscopy, Ultraviolet and Visible Spectroscopy (UV-Vis), X-ray spectroscopy, and Mass Spectrometry (MS), which are widely employed in the investigation of the surface properties of dental materials. Examples of the research of materials used as tooth fillings, surface preparation in dental prosthetics, cavity preparation methods and fractographic studies of dental implants are also presented. The cited studies show that the above techniques can be valuable tools as they are expanding the research capabilities of materials used in dentistry.

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28

Abe, Shinsuke, Kazuhisa Fujita, Yoshihiro Kakinami, Ohmi Iiyama, Hirohisa Kurosaki, Michael A. Shoemaker, Yasuo Shiba, Masayoshi Ueda, and Masaharu Suzuki. "Near-Ultraviolet and Visible Spectroscopy of HAYABUSA Spacecraft Re-Entry." Publications of the Astronomical Society of Japan 63, no. 5 (October 25, 2011): 1011–21. http://dx.doi.org/10.1093/pasj/63.5.1011.

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29

Robles, Tony, David Paige, and Cort Anastasio. "Lens-coupled liquid core waveguide for ultraviolet-visible absorption spectroscopy." Review of Scientific Instruments 77, no. 7 (July 2006): 073103. http://dx.doi.org/10.1063/1.2219973.

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30

Shi, K. Y., S. D. Yin, X. X. Tao, Y. Du, H. He, Z. P. Lv, and N. Xu. "Quantitative Measurement of Coal Bio-solubilization by Ultraviolet-visible Spectroscopy." Energy Sources, Part A: Recovery, Utilization, and Environmental Effects 35, no. 15 (August 3, 2013): 1456–62. http://dx.doi.org/10.1080/15567036.2010.521800.

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31

Yaney, Perry P., Dahv A. V. Kliner, Paul E. Schrader, and Roger L. Farrow. "Distributed-feedback dye laser for picosecond ultraviolet and visible spectroscopy." Review of Scientific Instruments 71, no. 3 (March 2000): 1296–305. http://dx.doi.org/10.1063/1.1150455.

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32

Kurtz, Joe, and Donald R. Huffman. "Combined infrared and ultraviolet‐visible spectroscopy matrix‐isolated carbon vapor." Journal of Chemical Physics 92, no. 1 (January 1990): 30–35. http://dx.doi.org/10.1063/1.458478.

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33

Daly, Steven, Alexander Kulesza, Geoffrey Knight, Luke MacAleese, Rodolphe Antoine, and Philippe Dugourd. "Visible and Ultraviolet Spectroscopy of Gas Phase Rhodamine 575 Cations." Journal of Physical Chemistry A 119, no. 22 (May 19, 2015): 5634–41. http://dx.doi.org/10.1021/acs.jpca.5b03187.

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34

Simon, Arno, Lutz Wunsch, and G�nter Zachmann. "FT transmission spectroscopy in the visible and ultraviolet spectral ranges." Mikrochimica Acta 95, no. 1-6 (January 1988): 311–13. http://dx.doi.org/10.1007/bf01349776.

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35

Manning, Thomas J., and James D. Winefordner. "A variable bandpass filter for ultraviolet/visible Fourier transform spectroscopy." Review of Scientific Instruments 61, no. 5 (May 1990): 1554–56. http://dx.doi.org/10.1063/1.1141171.

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36

Vetter, R., W. Reuter, and S. D. Peyerimhoff. "Theoretical spectroscopy of difluoromethylene in the visible and ultraviolet region." Chemical Physics 161, no. 3 (April 1992): 379–92. http://dx.doi.org/10.1016/0301-0104(92)80154-n.

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37

Rocha, Fellipy S., Anderson J. Gomes, Claure N. Lunardi, Serge Kaliaguine, and Gregory S. Patience. "Experimental methods in chemical engineering: Ultraviolet visible spectroscopy-UV-Vis." Canadian Journal of Chemical Engineering 96, no. 12 (November 13, 2018): 2512–17. http://dx.doi.org/10.1002/cjce.23344.

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38

Bigio, Irving J., and Judith R. Mourant. "Ultraviolet and visible spectroscopies for tissue diagnostics: fluorescence spectroscopy and elastic-scattering spectroscopy." Physics in Medicine and Biology 42, no. 5 (May 1, 1997): 803–14. http://dx.doi.org/10.1088/0031-9155/42/5/005.

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39

Gao, Yana, Jianguo Lu, Jianhua Zhang, and Xifeng Li. "The energy band tailored by Al incorporation in solution-processed IZO TFTs." RSC Advances 5, no. 47 (2015): 37635–39. http://dx.doi.org/10.1039/c5ra01800e.

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Анотація:

An intuitional measurement of energy band tailored aluminum indium zinc oxide (AIZO) work function and valance band energy level was conducted by ultraviolet photoelectron spectroscopy (UPS) along with the UV-visible spectroscopy analysis.

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40

van der Pal, Karin J., Mark Maric, Wilhelm van Bronswijk, and Simon W. Lewis. "Ultraviolet-visible spectroscopic characterisation of automotive window tints for forensic purposes." Analytical Methods 7, no. 13 (2015): 5391–95. http://dx.doi.org/10.1039/c5ay01381j.

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41

Wang, Xueliang, Yiyang Liu, Miao Shen, Xiaobin Fu, Ling Han, Guohong Ma, Hongtao Liu, and Long Yan. "The investigation of molten ZnCl2 natural particle suspensions." Analytical Methods 12, no. 9 (2020): 1229–36. http://dx.doi.org/10.1039/c9ay02680k.

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42

Nakum, Kiran, and Rajendrasinh N. Jadeja. "Synthesis, characterization, and electrochemical study of a mononuclear Cu(II) complex with a 4-acyl pyrazolone ligand." Zeitschrift für Naturforschung B 73, no. 10 (October 25, 2018): 713–18. http://dx.doi.org/10.1515/znb-2018-0117.

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Abstract1-(2-Chlorophenyl)-3-methyl-4-propionyl-1H-pyrazol-5(4H)-one was synthesized and characterized by Fourier transform infrared (FT-IR) spectroscopy, 1H nuclear magnetic resonance, and single-crystal X-ray analysis. Its Cu(II) complex was prepared and characterized by FT-IR, thermo gravimetric analysis-differential thermal analysis, ultraviolet-visible spectroscopy, cyclic voltammetry, and single-crystal X-ray structure determination. On the basis of analytical and spectroscopic techniques, a distorted square planar geometry of the complex has been found.

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Zhang, Ye, Li Yun Cao, Jian Feng Huang, and Jian Peng Wu. "Influence of S⁄La Molar Ratio on the Morphology and Optical Property of La₂S₃ Microcrystalline Prepared by Microwave Hydrothermal." Key Engineering Materials 512-515 (June 2012): 223–26. http://dx.doi.org/10.4028/www.scientific.net/kem.512-515.223.

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The La2S3 microcrystalline were prepared by microwave hydrothermal method (M–H). The influences of different S⁄La molar ratio on the phase composition, and morphology of the La2S3 microcrystalline were particularly investigated. The obtained samples were characterized by X–ray diffraction (XRD), scanning electron microscopy (SEM), ultraviolet and visible–spectroscopy (UV–vis) and photoluminescence spectroscopy (PL) at room temperature. XRD results show that the decrease of S⁄La molar ratio from 6⁄3 to 6⁄6, the improving in crystallization of the obtained microcrystalline is observed with the decrease in S⁄La molar ratio. The morphology of prepared La2S3 transforms from irregular shapes to quasi-sphere structure. The as-prepared microcrystalline show excellent absorbency of ultraviolet light and are almost transparent to visible light to exhibit stable violet-blue photoluminescence properties under the ultraviolet light excitation at room temperature.

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Ciaravella, A., J. C. Raymond, S. Fineschi, L. Gardner, J. Michels, R. O’Neal, J. Kohl, et al. "Ultraviolet Spectroscopy of a Coronal Mass Ejection." International Astronomical Union Colloquium 167 (1998): 370–75. http://dx.doi.org/10.1017/s025292110004793x.

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AbstractA coronal mass ejection (CME) event was observed on December 23, 1996 with the Ultraviolet Coronagraph Spectrometer in both ultraviolet and visible light channels at 0.5 R⊙ over the solar limb. The CME was followed during its evolution in the bright lines of Lyα (1216Å), Lyβ (1026Å), Lyγ (972Å), C III (977Å) and the OVI doublet (1032, 1037Å) and in several weaker lines. The Lyα peak intensity shows an excursion of two orders of magnitude during the CME evolution, and blue shifts up to 0.8Å (~200 km/sec). The data provide the emission measure in the Log T range 4.0–5.5 with a 0.3 sampling. Line intensities and profiles have been measured, providing important diagnostics for a detailed study of the CME’s physical and dynamical parameters.

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45

Dalmau, Rafael, Samuel Kirby, Jeffrey Britt, and Raoul Schlesser. "(Invited) Deep Level Defects in AlN Studied By UV-Visible Spectroscopy." ECS Transactions 109, no. 8 (September 30, 2022): 31–40. http://dx.doi.org/10.1149/10908.0031ecst.

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Ultraviolet-visible (UV-Vis) spectroscopy was used to measure the optical absorption and emission from high-quality, 2-inch AlN substrates grown by physical vapor transport (PVT). Spatially uniform UV absorption coefficients below 20 cm-1 at 4.68 eV (265 nm) were demonstrated. The complementary spectroscopic data were used to elucidate the mechanism of UV absorption reduction in AlN containing high levels of the carbon impurity and co-doped with Si. Formation of a carbon-silicon defect complex, which shifted the absorption deeper in the UV, was demonstrated by photoluminescence (PL) emission and PL excitation (PLE) measurements. Additional deep levels in AlN related to cation vacancy complexes with oxygen were identified and discussed.

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46

Li, Ming. "Spectroscopic Study on the Species and Color Differences of Gem-Quality Red Garnets from Malawi." Journal of Spectroscopy 2022 (September 27, 2022): 1–9. http://dx.doi.org/10.1155/2022/1638042.

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To reveal the species of gem-grade red garnets with similar colors, especially the mechanisms underlying their subtle color differences, a series of tests, including conventional gemological tests, X-ray diffraction, Fourier-transform infrared spectroscopy, ultraviolet-visible spectroscopy, and X-ray photoelectron spectroscopy, were performed on gem-grade red garnets mined from Malawi. The results demonstrated that the color difference is not caused by the difference in species, and both the purplish-red and maroon-red garnets were magnesium-aluminum garnets (pyrope). They both contained the transition metal ions Fe2+, Mn2+, Fe3+, and Cr3+, with Fe2+ and Mn2+ occupying crystal site A and Fe3+ and Cr3+ occupying crystal site B. Cr3+ absorption peaks were observed at 367 and 690 nm; Fe3+ absorption peaks were observed at 502, 528, and 570 nm; and Mn2+ absorption peaks were observed at 400, 423, and 460 nm, which contributed to their respective colors. However, while the maroon-red pyrope had a larger Fe2+/Fe3+ ratio than the purplish-red pyrope, it lacked Mn2+ ions, which is the cause of the color difference between the two pyrope garnets. To date, the study of color differences in red garnets remains a major controversial topic. This study proposed an innovative spectroscopic approach, particularly the combination of ultraviolet-visible spectroscopy and X-ray photoelectron spectroscopy, thus providing a novel methodology for investigating color differences in red garnets.

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Reddy, B. Jagannatha, Ray L. Frost, Matt L. Weier, and Wayde N. Martens. "Ultraviolet-Visible, near Infrared and Mid Infrared Reflectance Spectroscopy of Turquoise." Journal of Near Infrared Spectroscopy 14, no. 4 (August 2006): 241–50. http://dx.doi.org/10.1255/jnirs.641.

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48

Mitsuke, Koichiro. "Ultraviolet and visible dispersed spectroscopy for the photofragments produced from H2O in the extreme ultraviolet." Journal of Chemical Physics 117, no. 18 (November 8, 2002): 8334–40. http://dx.doi.org/10.1063/1.1511181.

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Kolar, Wesley, and Ron Williams. "Comparison of Interferogram Noises in the Ultraviolet and Visible Regions." Applied Spectroscopy 46, no. 4 (April 1992): 615–19. http://dx.doi.org/10.1366/0003702924124989.

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The sources of noise in ultraviolet (UV), visible, and near-infrared (NIR) interferograms acquired with silicon and germanium diodes as well as photomultiplier tube (PMT) detectors have been investigated. Similar conditions were used with each detector so that noises could be compared with minimal bias. Interferograms were produced from tungsten and deuterium lamps as well as an inductively coupled plasma (ICP). Data were collected from two instruments; a Mattson Sirius 100 UV/Vis spectrometer, and a Chelsea Instruments FT 500. The signal was the average of 4 to 100 interferograms, while the standard deviation of the data was the noise. In addition to the average and the standard deviation, which are the first two moments of the frequency distribution, the third moment (known as skew) was employed to analyze the symmetry of noise distributions.

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50

Zhou, Xiaosong, Fei Yang, Bei Jin, Tang Xu, Yaqing Yang, and Xiaohui Yao. "Photosensitization of Carbon Nitride Photoelectrodes with CdS: A Novel Architecture with Highly Efficient Photocatalytic Activity." International Journal of Photoenergy 2014 (2014): 1–8. http://dx.doi.org/10.1155/2014/843873.

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CdS with well-defined crystallinity is anchored on carbon nitride photoelectrodes by a successive chemical bath deposition. And the as-synthesized samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, ultraviolet-visible diffuse reflection spectroscopy, X-ray photoelectron spectroscopy, and photoluminescence spectroscopy techniques. The effect of the amount of CdS on the catalytic activity for the degradation of acid Orange II is investigated under visible light irradiation. Results show that the photoelectrodes composed of CdS/CN exhibit much higher catalytic activity than pure CN photoelectrodes. A possible photocatalytic mechanism of the CdS/CN electrodes is proposed under visible light irradiation.

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