Journal articles: 'Raman spectroscopic characterization'

1

REDD, DOUGLAS C. B. "RAMAN SPECTROSCOPIC TISSUE CHARACTERIZATION." INVESTIGATIVE RADIOLOGY 28, no. 12 (December 1993): 1189. http://dx.doi.org/10.1097/00004424-199312000-00060.

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Tang, Bo, Hu Guoxin, and Hanyang Gao. "Raman Spectroscopic Characterization of Graphene." Applied Spectroscopy Reviews 45, no. 5 (September 17, 2010): 369–407. http://dx.doi.org/10.1080/05704928.2010.483886.

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Bonhommeau, Sébastien. "Special Issue on “Raman Spectroscopy for Chemical and Structural Characterization in Biology”." International Journal of Molecular Sciences 23, no. 19 (October 4, 2022): 11795. http://dx.doi.org/10.3390/ijms231911795.

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Sze, S. "Raman spectroscopic characterization of carbonaceous aerosols." Atmospheric Environment 35, no. 3 (2001): 561–68. http://dx.doi.org/10.1016/s1352-2310(00)00325-3.

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Ramirez-Mora, Tatiana, Claudia Dávila-Pérez, Fernando Torres-Méndez, and Grettel Valle-Bourrouet. "Raman Spectroscopic Characterization of Endodontic Biofilm Matrices." Journal of Spectroscopy 2019 (January 10, 2019): 1–7. http://dx.doi.org/10.1155/2019/1307397.

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Endodontic persistent infections are often mediated by bacterial biofilms. This mode of bacterial growth is characterized by the presence of a matrix mainly composed of extracellular polymeric substances (EPSs) that protect the encased microorganisms. To establish better control and disinfection protocols, elucidation of the main components of biofilm matrices present in endodontic infections is required. The aim of the present study was to characterize the principal components ofE. faecalis,A. naeslundii, and dual-species biofilm matrices by means of Raman spectroscopy and confocal scanning laser microscopy (CSLM) techniques. The total biomass of biofilms was quantified via crystal violet assays, and the monospecies biofilms showed higher biomass than the dual-species biofilms. Raman spectroscopy and confocal laser scanning microscopy were used to identify the biochemical composition and structure of the biofilm matrices. Spectra originating from the biofilms of two endodontic pathogens show the presence of carbohydrates, proteins, fatty acids, and nucleic acids in all samples; however, variation in the levels of expression of these biomolecules allows spectroscopic differentiation of the biofilms using principal component analysis. This study is the first attempt to identify the composition of monospecies and dual-species biofilms of endodontic origin. Our data provides an important approach to the understanding of molecular dynamics of endodontic infections.

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Hu, Kaiyue, Luigi Brambilla, Patrizia Sartori, Claudia Moscheni, Cristiana Perrotta, Lucia Zema, Chiara Bertarelli, and Chiara Castiglioni. "Development of Tailored Graphene Nanoparticles: Preparation, Sorting and Structure Assessment by Complementary Techniques." Molecules 28, no. 2 (January 5, 2023): 565. http://dx.doi.org/10.3390/molecules28020565.

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We present a thorough structural characterization of Graphene Nano Particles (GNPs) prepared by means of physical procedures, i.e., ball milling and ultra-sonication of high-purity synthetic graphite. UV-vis absorption/extinction spectroscopy, Dynamic Light Scattering, Transmission Electron Microscopy, IR and Raman spectroscopies were performed. Particles with small size were obtained, with an average lateral size <L> = 70–120 nm, formed by few <N> = 1–10 stacked layers, and with a small number of carboxylic groups on the edges. GNPs relatively more functionalized were separated by centrifugation, which formed stable water dispersions without the need for any surfactant. A critical reading and unified interpretation of a wide set of spectroscopic data was provided, which demonstrated the potential of Specular Reflectance Infrared Spectroscopy for the diagnosis and quantification of chemical functionalization of GNPs. Raman parameters commonly adopted for the characterization of graphitic materials do not always follow a monotonic trend, e.g., with the particle size and shape, thus unveiling some limitations of the available spectroscopic metrics. This issue was overcome thanks to a comparative spectra analysis, including spectra deconvolution by means of curve fitting procedures, experiments on reference materials and the exploitation of complementary characterization techniques.

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Ahern, Angela M., Paul R. Schwartz, and Lori A. Shaffer. "Characterization of Conversion-Coated Aluminum Using Fourier Transform Infrared and Raman Spectroscopies." Applied Spectroscopy 46, no. 9 (September 1992): 1412–19. http://dx.doi.org/10.1366/0003702924123764.

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Fourier transform infrared and Raman spectroscopies have been employed to define the molecular composition of chromium phosphate conversion coatings on aluminum. Attenuated total reflectance at 55° can be employed to probe the structure of conversion coatings present on aluminum at relatively high coating weights (≥23 mg Cr/m2). Both reflection-absorption infrared and surface-enhanced Raman spectroscopic techniques can discern the presence of conversion coatings at coverages as low as 9 mg Cr/m2. On the basis of the vibrational spectra from these techniques, we have determined that hydrated chromium phosphate is the major component in these conversion coatings on aluminum. Reflection-absorption infrared and surface-enhanced Raman spectroscopies also provide a means to determine the molecular structure of the nascent oxide layer on aluminum as a function of processing conditions. Specular reflection, attenuated total reflectance at 35°, diffuse reflectance, and Raman spectroscopic methods, in general, lack the surface sensitivity necessary to probe thin (≤23 mg/m2) inorganic films on aluminum.

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Sahu, Sumit Ranjan, Mayanglambam Manolata Devi, Puspal Mukherjee, Pratik Sen, and Krishanu Biswas. "Optical Property Characterization of Novel Graphene-X (X=Ag, Au and Cu) Nanoparticle Hybrids." Journal of Nanomaterials 2013 (2013): 1–9. http://dx.doi.org/10.1155/2013/232409.

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The present investigation reports new results on optical properties of graphene-metal nanocomposites. These composites were prepared by a solution-based chemical approach. Graphene has been prepared by thermal reduction of graphene oxide (GO) at 90°C by hydrazine hydrate in an ammoniacal medium. This ammoniacal solution acts as a solvent as well as a basic medium where agglomeration of graphene can be prevented. This graphene solution has further been used for functionalization with Ag, Au, and Cu nanoparticles (NPs). The samples were characterized by X-ray diffraction (XRD), Raman spectroscopy, UV-Vis spectroscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM) to reveal the nature and type of interaction of metal nanoparticles with graphene. The results indicate distinct shift of graphene bands both in Raman and UV-Vis spectroscopies due to the presence of the metal nanoparticles. Raman spectroscopic analysis indicates blue shift of D and G bands in Raman spectra of graphene due to the presence of metal nanoparticles except for the G band of Cu-G, which undergoes red shift, reflecting the charge transfer interaction between graphene sheets and metal nanoparticles. UV-Vis spectroscopic analysis also indicates blue shift of graphene absorption peak in the hybrids. The plasmon peak position undergoes blue shift in Ag-G, whereas red shift is observed in Au-G and Cu-G.

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Wentrup-Byrne, E., L. Rintoul, J. L. Smith, and P. M. Fredericks. "Comparison of Vibrational Spectroscopic Techniques for the Characterization of Human Gallstones." Applied Spectroscopy 49, no. 7 (July 1995): 1028–36. http://dx.doi.org/10.1366/0003702953964813.

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A suite of human gallstones was investigated by vibrational spectroscopic techniques with a view to developing an effective characterization procedure. Using infrared microscopy, microspectroscopic mapping, infrared photoacoustic spectroscopy (PAS), and FT-Raman spectroscopy, we have examined both the chemical composition and the microstructure of the different categories of human gallstones. We show how infrared microscopy can be used to determine the chemical identity of particular microstructural features of a stone. Infrared mapping produces functional group maps of the surface of a gallstone and shows the actual distribution of the different chemical components. Good fluorescence-free FT-Raman spectra were obtained from all categories of stones except black stones, which gave a fluorescence background with no observable Raman spectrum. Of the vibrational techniques studied, PAS proved the most suited to the spectroscopic categorization of gallstones because data for the whole stone can be obtained with minimal sample preparation. The advantages and disadvantages of each technique are discussed.

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Wu, Zhangting, and Zhenhua Ni. "Spectroscopic investigation of defects in two-dimensional materials." Nanophotonics 6, no. 6 (March 11, 2017): 1219–37. http://dx.doi.org/10.1515/nanoph-2016-0151.

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AbstractTwo-dimensional (2D) materials have been extensively studied in recent years due to their unique properties and great potential for applications. Different types of structural defects could present in 2D materials and have strong influence on their properties. Optical spectroscopic techniques, e.g. Raman and photoluminescence (PL) spectroscopy, have been widely used for defect characterization in 2D materials. In this review, we briefly introduce different types of defects and discuss their effects on the mechanical, electrical, optical, thermal, and magnetic properties of 2D materials. Then, we review the recent progress on Raman and PL spectroscopic investigation of defects in 2D materials, i.e. identifying of the nature of defects and also quantifying the numbers of defects. Finally, we highlight perspectives on defect characterization and engineering in 2D materials.

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Kowalik, Gabriela, Krystyna Rogosz, and Teresa Kowalska. "Raman Spectroscopic Characterization of RP-18-Type Chemically Bonded Stationary Phases for Liquid Chromatography." Journal of AOAC INTERNATIONAL 82, no. 2 (March 1, 1999): 297–304. http://dx.doi.org/10.1093/jaoac/82.2.297.

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Abstract This study is the first Raman spectroscopic characterization of conventional chemically bonded liquid chromatographic (LC) stationary phases of the RP-18 type using the high-power Nd:WV04 neodymium laser. Raman spectra were obtained for octadecyl (C18) chemically bonded silica-based stationary phases, as well as for silica, aminopropyl (NH2), cyanopropyl (CN), diol (OH), octyl (C8), and methyl (C1) phases for comparison. This study demonstrates that Raman spectroscopy using the high-power neodymium laser can be used to study RP-18-type LC stationary phases and to quantitate the density of coverage of the silica matrix with octadecyl ligands. The paper presents the experimental setup and conditions usedto obtain Raman spectra of commercial RP-18-type chemically bonded stationary phases and examines the spectroscopic similarities and differences observed for different bonded ligands typically used in reversed-phase and normal-phase LC separations.

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Tomar, M. S., R. Melgarejo, P. S. Dobal, and R. S. Katiyar. "Synthesis of Zn1–xMgxO and its structural characterization." Journal of Materials Research 16, no. 4 (April 2001): 903–6. http://dx.doi.org/10.1557/jmr.2001.0127.

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Zn1–xMgxO is an important material for optoelectronic devices. We synthesized this material using a solution-based route. We investigated in detail the structural behavior of this material system using x-ray diffraction and Raman spectroscopy. Mg substitution up to x ≈ 0.10 does not change the crystal structure, as revealed by x-ray diffraction and Raman spectroscopic studies. This synthesis route is also suitable to prepare thin films by spin coating with the possibility of p and n doping.

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Zhang, Li, Tao Qian, Xingyu Zhu, Zhongli Hu, Mengfan Wang, Liya Zhang, Tao Jiang, Jing-Hua Tian, and Chenglin Yan. "In situ optical spectroscopy characterization for optimal design of lithium–sulfur batteries." Chemical Society Reviews 48, no. 22 (2019): 5432–53. http://dx.doi.org/10.1039/c9cs00381a.

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Recent advances in optimal design of lithium–sulfur batteries with the aid of in situ optical spectroscopic techniques, including Raman, infrared and ultraviolet-visible spectroscopies, are systematically summarized.

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Dong, Zuoyuan, Hejun Xu, Fang Liang, Chen Luo, Chaolun Wang, Zi-Yu Cao, Xiao-Jia Chen, Jian Zhang, and Xing Wu. "Raman Characterization on Two-Dimensional Materials-Based Thermoelectricity." Molecules 24, no. 1 (December 27, 2018): 88. http://dx.doi.org/10.3390/molecules24010088.

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The emergence and development of two-dimensional (2D) materials has provided a new direction for enhancing the thermoelectric (TE) performance due to their unique structural, physical and chemical properties. However, the TE performance measurement of 2D materials is a long-standing challenge owing to the experimental difficulties of precise control in samples and high demand in apparatus. Until now, there is no universal methodology for measuring the dimensionless TE figure of merit (ZT) (the core parameter for evaluating TE performance) of 2D materials systematically in experiments. Raman spectroscopy, with its rapid and nondestructive properties for probing samples, is undoubtedly a powerful tool for characterizing 2D materials as it is known as a spectroscopic ‘Swiss-Army Knife’. Raman spectroscopy can be employed to measure the thermal conductivity of 2D materials and expected to be a systematic method in evaluating TE performance, boosting the development of thermoelectricity. In this review, thermoelectricity, 2D materials, and Raman techniques, as well as thermal conductivity measurements of 2D materials by Raman spectroscopy are introduced. The prospects of obtaining ZT and testing the TE performance of 2D materials by Raman spectroscopy in the future are also discussed.

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Kunapareddy, Nagapratima, James P. Freyer, and Judith R. Mourant. "Raman spectroscopic characterization of necrotic cell death." Journal of Biomedical Optics 13, no. 5 (2008): 054002. http://dx.doi.org/10.1117/1.2978061.

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Meyer, N., K. Nestler, L. Engisch, G. Marx, M. Füting, A. Kiesow, A. Heilmann, S. Wartewig, and P. Kleinebudde. "Raman spectroscopic surface characterization of cellulose derivatives." Fresenius' Journal of Analytical Chemistry 370, no. 6 (July 1, 2001): 789–91. http://dx.doi.org/10.1007/s002160100864.

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Redd, Douglas C. B., Zhe Chuan Feng, Kwok To Yue, and Ted S. Gansler. "Raman Spectroscopic Characterization of Human Breast Tissues: Implications for Breast Cancer Diagnosis." Applied Spectroscopy 47, no. 6 (June 1993): 787–91. http://dx.doi.org/10.1366/0003702934067072.

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Development and application of laser-based diagnostic and therapeutic procedures have been hindered by the current technical inadequacies in tissue diagnosis and characterization. It is now possible to apply the techniques of Raman spectroscopy to achieve rapid, noninvasive, and nondestructive differentiation of diseased from normal tissues. Normal and diseased breast tissues were examined by Raman spectroscopy. The Raman spectra obtained contain features that are attributable to various amounts of carotenoids and lipids. A small contribution from a heme-type signal was detected in some samples of clinically abnormal yet histopathologically benign breast tissue, while a much stronger heme-type signal was detected in most of the breast cancers. Raman spectra of diseased breast tissue (benign and malignant) also show markedly diminished to absent contributions from lipids and reduced contributions from carotenoids. This laser-based spectroscopic modality is readily adaptable to reflected light microscopy and optical fiber techniques, making it potentially useful as an aid in real-time diagnosis, and may thus find application in the fields of histopathology and interventional radiology.

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Pazin, Wallance M., Leonardo N. Furini, Vita Solovyeva, Tibebe Lemma, Rafael J. G. Rubira, Bjarke Jørgensen, Carlos J. L. Constantino, and Jonathan R. Brewer. "Vibrational Spectroscopic Characterization and Coherent Anti-Stokes Raman Spectroscopy (CARS) Imaging of Artepillin C." Applied Spectroscopy 74, no. 7 (April 30, 2020): 751–57. http://dx.doi.org/10.1177/0003702820904456.

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In the following work, the vibrational spectroscopic characteristics of artepillin C are reported by means of Fourier transform infrared (FT-IR) and Raman spectroscopies, surface-enhanced Raman scattering (SERS), and coherent anti-Stokes Raman scattering (CARS) microscopy. Artepillin C is an interesting compound due to its pharmacological properties, including antitumor activity. It is found as the major component of Brazilian green propolis, a resinous mixture produced by bees to protect their hives against intruders. Vibrational spectroscopic techniques have shown a strong peak at 1599 cm−1, assigned to C=C stretching vibrations from the aromatic ring of artepillin C. From these data, direct visualization of artepillin C could be assessed by means of CARS microscopy, showing differences in the film hydration obtained for its neutral and deprotonated states. Raman-based methods show potential to visualize the uptake and action of artepillin C in biological systems, triggering its interaction with biological systems that are needed to understand its mechanism of action.

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Jehlička, Jan, Howell G. M. Edwards, and Aharon Oren. "Raman Spectroscopy of Microbial Pigments." Applied and Environmental Microbiology 80, no. 11 (March 28, 2014): 3286–95. http://dx.doi.org/10.1128/aem.00699-14.

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ABSTRACTRaman spectroscopy is a rapid nondestructive technique providing spectroscopic and structural information on both organic and inorganic molecular compounds. Extensive applications for the method in the characterization of pigments have been found. Due to the high sensitivity of Raman spectroscopy for the detection of chlorophylls, carotenoids, scytonemin, and a range of other pigments found in the microbial world, it is an excellent technique to monitor the presence of such pigments, both in pure cultures and in environmental samples. Miniaturized portable handheld instruments are available; these instruments can be used to detect pigments in microbiological samples of different types and origins under field conditions.

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Murad, Enver. "Instrumental characterization of geological materials and their synthetic analogs." Pure and Applied Chemistry 87, no. 3 (March 1, 2015): 301–6. http://dx.doi.org/10.1515/pac-2014-0714.

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AbstractThe mineralogy of geological samples is generally determined by optical microscopy or X-ray diffraction. 57Fe Mössbauer and Raman spectroscopies are effective alternative non-destructive nuclear and vibrational instrumental techniques that can – in conjunction with the former procedures, and all the more when these fail – serve for mineral characterization. In favorable cases these spectroscopic techniques enable, beyond a mere general characterization, the conclusive identification of selected minerals.

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Ji, Zhurun, Rucheng Dai, and Zengming Zhang. "Characterization of fine particulate matter in ambient air by combining TEM and multiple spectroscopic techniques – NMR, FTIR and Raman spectroscopy." Environmental Science: Processes & Impacts 17, no. 3 (2015): 552–60. http://dx.doi.org/10.1039/c4em00678j.

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We report a study of the microstructures and spectroscopic characteristics of PM_2.5and its potential sources in Beijing by combining transmission electron microscopy and multiple spectroscopic techniques: nuclear magnetic resonance, Fourier transform infrared and Raman spectroscopy.

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Elger and Hess. "Application of Raman Spectroscopy to Working Gas Sensors: From in situ to operando Studies." Sensors 19, no. 23 (November 20, 2019): 5075. http://dx.doi.org/10.3390/s19235075.

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Understanding the mode of operation of gas sensors is of great scientific and economic interest. A knowledge-based approach requires the development and application of spectroscopic tools to monitor the relevant surface and bulk processes under working conditions (operando approach). In this review we trace the development of vibrational Raman spectroscopy applied to metal-oxide gas sensors, starting from initial applications to very recent operando spectroscopic approaches. We highlight the potential of Raman spectroscopy for molecular-level characterization of metal-oxide gas sensors to reveal important mechanistic information, as well as its versatility regarding the design of in situ/operando cells and the combination with other techniques. We conclude with an outlook on potential future developments.

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Gotts, H. "Characterization of Process Induced Contamination and Residues on Semiconductor Components Via FTIR and Raman Microanalysis." Microscopy and Microanalysis 7, S2 (August 2001): 152–53. http://dx.doi.org/10.1017/s1431927600026830.

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FTIR and Raman microanalysis may be used as a powerful combination to determine the identity, and hence infer the source, of contaminant particles which diminish yields of semiconductor components and devices. The complimentarity of these techniques arises from the underlying spectroscopic selection rules.Vibrational spectroscopic techniques are commonly used to characterize the molecular structure of bulk organic materials. These bulk materials typically represent purified fractions of components which may be further investigated with various classical instrumental techniques such as Differential Scanning Calorimetry (DSC), Nuclear Magnetic Resonance (NMR) spectroscopy, UV-Vis spectroscopy. However, these classical technique may have limited value for the interrogation of small impure particles or materials of limited quantity(ng.).Elemental techniques such as Scanning Electron Microscopy coupled to Energy Dispersive Spectroscopy are enhanced by the specificity of FTIR Microprobe Spectroscopy and Raman Microprobe Spectroscopy which are now used in process laboratories to characterize and identify particulate and thin film residues with the intent of device yield enhancement.

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Muresan-Pop, Marieta, Irina Kacsó, Xenia Filip, Emilia Vanea, G. Borodi, N. Leopold, I. Bratu, and S. Simon. "Spectroscopic and physical–chemical characterization of ambazone–glutamate salt." Spectroscopy 26, no. 2 (2011): 115–28. http://dx.doi.org/10.1155/2011/414103.

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Ambazone monohydrate C8H11N7S · H2O (AMB), a well-known antimicrobial compound, was used together with Glutamic Acid C5H9NO4(Glu) to obtain a new solid form using the solvent-drop grinding procedure. The screening of the new solid form was best achieved by the combined use of X-ray Powder Diffraction (XRPD) and several spectroscopic techniques (Fourier Transformed Infrared Spectroscopy (FTIR), X-ray Photoelectron Spectroscopy (XPS), Raman and13C-NMR spectroscopy) together with Differential Scanning Calorimetry (DSC), Differential thermal analysis and thermogravimetry (DTA–TGA). The combination of the mentioned analytical techniques allows the compound to be assigned to an ambazone–glutamate salt which crystallizes in monoclinic system having the following lattice parameters:a=9.8352,b=4.7014,c=40.0987 Å and β=94.505°. DSC, TGA data and the before mentioned spectroscopic techniques support the ambazone–glutamate salt formation.

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García-Bucio, Ma A., E. Casanova-González, and J. L. Ruvalcaba-Sil. "Raman Spectroscopy for the Study of XVI-XVII Centuries Colonial Paintings." MRS Proceedings 1618 (2014): 141–51. http://dx.doi.org/10.1557/opl.2014.463.

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ABSTRACTOutstanding information about the material composition and pictorial techniques of the New Spain Colonial painting can be obtained via a full characterization using a set of analytical techniques. Given the cultural importance of this painting, a non-invasive approach is preferred. Moreover, the preparation and use of reference materials using original recipes is necessary for a correct interpretation of the spectroscopic data from historical objects. Here, we present the results obtained via an in-situ Raman spectroscopic analysis of a set of pictorial reference materials, created according to XVI and XVII centuries’ recipes. Several difficulties were encountered, such as the low Raman detection signal, an intrinsic fluorescence of the material, and in some cases even laser-induced degradation. For this reason, the usual molecular Raman analysis was extended to Surface Enhanced Raman Spectroscopy (SERS), which enhances the Raman signal and quenches the fluorescence. It was then applied to the analysis of two wood paintings from the ex-convent San Francisco Tepeyanco, in Tlaxcala.

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Duraipandian, Shiyamala, Jianhua Mo, Wei Zheng, and Zhiwei Huang. "Near-infrared Raman spectroscopy for assessing biochemical changes of cervical tissue associated with precarcinogenic transformation." Analyst 139, no. 21 (2014): 5379–86. http://dx.doi.org/10.1039/c4an00795f.

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Politano, Grazia Giuseppina, Marco Castriota, Maria Penelope De Santo, Mario Michele Pipita, Giovanni Desiderio, Carlo Vena, and Carlo Versace. "Variable Angle Spectroscopic Ellipsometry Characterization of Spin-Coated MoS2 Films." Materials Proceedings 4, no. 1 (November 12, 2020): 86. http://dx.doi.org/10.3390/iocn2020-07978.

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In the field of Transition Metal Dichalcogenides (TMDCs), molybdenum disulfide (MoS2) has attracted an outstanding interest due to it having several applications. MoS2 has potentialities not yet fully realized in solution-based applications. However, the lack of knowledge of the optical properties of MoS2, especially in the infrared range, has significantly limited its use in many exciting photonic fields. In this work, the broadband optical properties of MoS2 films deposited by spin-coating onto Si/SiO2 substrates were studied by means of Variable Angle Spectroscopic Ellipsometry (VASE). The morphological and the structural properties of the samples were investigated by Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM) and Micro-Raman Spectroscopy. Micro-Raman spectroscopy measurements reveal the presence of 2H-MoS2 and 1T-MoS2 phases. The optical properties of the films show a mid-gap state at 0.6 eV, not reported in an ellipsometry work before, induced by defects in the MoS2 samples.

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Poborchii, Vladimir, Hiroyuki Ishii, Hiroyuki Hattori, Wen-Hsin Chang, Tatsuro Maeda, Tetsuya Tada, and Pavel I. Geshev. "Raman spectroscopic characterization of germanium-on-insulator nanolayers." Applied Physics Letters 108, no. 8 (February 22, 2016): 083107. http://dx.doi.org/10.1063/1.4942607.

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Huang, Zufang, Xiwen Chen, Yanping Chen, Jinhua Chen, Min Dou, Shangyuan Feng, Haishan Zeng, and Rong Chen. "Raman spectroscopic characterization and differentiation of seminal plasma." Journal of Biomedical Optics 16, no. 11 (2011): 110501. http://dx.doi.org/10.1117/1.3650310.

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Yang, Yu-hui, and Ting Wang. "Fourier transform Raman spectroscopic characterization of humic substances." Vibrational Spectroscopy 14, no. 1 (March 1997): 105–12. http://dx.doi.org/10.1016/s0924-2031(96)00044-6.

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Holz, L., A. Semjonow, K. Lenz, A. Lau, W. Richter, and H. Wilhelm. "Raman spectroscopic characterization of KrF‐laser‐irradiated silicon." Journal of Applied Physics 72, no. 6 (September 15, 1992): 2472–77. http://dx.doi.org/10.1063/1.351593.

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Ramana, C. V., M. Massot, and C. M. Julien. "XPS and Raman spectroscopic characterization of LiMn2O4 spinels." Surface and Interface Analysis 37, no. 4 (2005): 412–16. http://dx.doi.org/10.1002/sia.2022.

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Finger, Raphael, Thomas C. Hansen, and Holger Kohlmann. "Simultaneous neutron powder diffraction and Raman spectroscopy – an approach of combining two complementary techniques." Zeitschrift für Kristallographie - Crystalline Materials 236, no. 11-12 (November 22, 2021): 325–28. http://dx.doi.org/10.1515/zkri-2021-2051.

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Abstract Diffraction techniques are well-established methods for crystal structure determination as well as phase identification and quantification. Raman spectroscopy can be a valuable complementary characterization technique, because in contrast to the former it yields also information on amorphous materials and it is a probe for short-range structural effects. The herein presented setup allows for simultaneous neutron diffraction and Raman spectroscopy, shown with a sample of lead sulfate under ambient conditions as a proof of principle. In order to fulfil requirements of both methods, a sapphire single-crystal is used as a sample holder. Practical considerations for successful simultaneous in situ neutron diffraction and Raman spectroscopic measurements are given.

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Yin, Yin, Wu, Qi, Tian, Zhang, Hu, and Feng. "Characterization of Coals and Coal Ashes with High Si Content Using Combined Second-Derivative Infrared Spectroscopy and Raman Spectroscopy." Crystals 9, no. 10 (October 2, 2019): 513. http://dx.doi.org/10.3390/cryst9100513.

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The organic and mineral components in two coals and resulting high-temperature ashes with high silicon content were characterized by second-derivative infrared spectroscopy, Raman spectroscopy, and X-ray diffraction (XRD). The infrared spectra of raw coals show weak organic functional groups bands but strong kaolinite bands because of the relatively high silicates content. In contrast, the Raman spectra of raw coals show strong disordered carbon bands but no mineral bands since Raman spectroscopy is highly sensitive to carbonaceous phases. The overlapping bands of mineral components (e.g., calcite, feldspar, and muscovite) were successfully resolved by the method of second-derivative infrared spectroscopy. The results of infrared spectra indicate the presence of metakaolinite in coal ashes, suggesting the thermal transformation of kaolinite during ashing. Intense quartz bands were shown in both infrared and Raman spectra of coal ashes. In addition, Raman spectra of coal ashes show a very strong characteristic band of anatase (149 cm–1), although the titanium oxides content is very low. Combined use of second-derivative infrared spectroscopy and Raman spectroscopy provides valuable insight into the analyses of mineralogical composition. The XRD results generally agree with those of FTIR and Raman spectroscopic analyses.

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Svitasheva, S. N., and George A. Pozdnyakov. "Monitoring Technological Conditions for Preparing DLC Films in Supersonic Flow of Hydrocarbon Plasma." Key Engineering Materials 538 (January 2013): 281–84. http://dx.doi.org/10.4028/www.scientific.net/kem.538.281.

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Properties of diamond-like carbon films deposited by a new method in a supersonic flow of hydrocarbon plasma generated by a disk-type magneto-hydro-dynamic accelerator were studied. Two methods are used for optical and structural characterization of diamond-like carbon films: nondestructive spectroscopic ellipsometry and Raman spectroscopy.

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Francioso, O., S. Sánchez-Cortés, V. Tugnoli, C. Ciavatta, and C. Gessa. "Characterization of Peat Fulvic Acid Fractions by Means of FT-IR, SERS, and 1H, 13C NMR Spectroscopy." Applied Spectroscopy 52, no. 2 (February 1998): 270–77. http://dx.doi.org/10.1366/0003702981943347.

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Fourier transform infrared (FT-IR), surface-enhanced Raman spectroscopy (SERS), and nuclear magnetic resonance (NMR) (1H and 13C) have been applied to the characterization of un fractionated and fractionated fulvic acids extracted from an Irish peat. Raman study of these compounds is possible on rough metallic surfaces, which enhance the Raman signal and quench the high fluorescence. The application of these spectroscopic techniques has provided important structural information concerning the aromaticity and the carboxylate and carbohydrate group contents in each fraction. In addition, a SERS study at different pH levels has revealed interesting interfacial behavior of these components based on electric charge and conformational changes.

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Datta, Monika, Robert E. Jansson, and John J. Freeman. "In Situ Resonance Raman Spectroscopic Characterization of Electrogenerated Methyl Viologen Radical Cation on Carbon Electrode." Applied Spectroscopy 40, no. 2 (February 1986): 251–58. http://dx.doi.org/10.1366/0003702864509637.

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In situ Raman spectroscopic characterization of solution and surface species on a carbon electrode is reported. An optical flow-through cell has been designed for the characterization of electrode surfaces and electrogenerated solution species during an electrochemical reaction. The electrogeneration of the methyl viologen (1,1′-dimethyl-4,4′-bipyridine) radical cation (MV+) at a carbon electrode in aqueous chloride solution has been studied with the use of laser Raman spectroscopy. In the case of the radical ion, resonance enhancement of the order of 25–30 was observed with 514.5 nm excitation. The effect of concentration, potential, and flow rate on the observed spectrum is discussed. Time-dependent studies with optical multichannel analyzer detection suggest the formation of a multilayer film on the electrode.

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Katsara, Klytaimnistra, Konstantina Psatha, George Kenanakis, Michalis Aivaliotis, and Vassilis M. Papadakis. "Subtyping on Live Lymphoma Cell Lines by Raman Spectroscopy." Materials 15, no. 2 (January 12, 2022): 546. http://dx.doi.org/10.3390/ma15020546.

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Raman spectroscopy is a well-defined spectroscopic technique sensitive to the molecular vibrations of materials, since it provides fingerprint-like information regarding the molecular structure of the analyzed samples. It has been extensively used for non-destructive and label-free cell characterization, particularly in the qualitative and quantitative estimation of amino acids, lipids, nucleic acids, and carbohydrates. Lymphoma cell classification is a crucial task for accurate and prompt lymphoma diagnosis, prognosis, and treatment. Currently, it is mostly based on limited information and requires costly and time-consuming approaches. In this work, we are proposing a fast characterization and differentiation methodology of lymphoma cell subtypes based on Raman spectroscopy. The study was performed in the temperature range of 15–37 °C to identify the best cell measurement conditions. The proposed methodology is fast, accurate, and requires minimal sample preparation, resulting in a potentially promising, non-invasive strategy for early and accurate cell lymphoma characterization.

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Monti, P., P. Taddei, G. Freddi, T. Asakura, and M. Tsukada. "Raman spectroscopic characterization ofBombyx mori silk fibroin: Raman spectrum of Silk I." Journal of Raman Spectroscopy 32, no. 2 (2001): 103–7. http://dx.doi.org/10.1002/jrs.675.

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KHANG, NGUYEN CAO, and NGUYEN VAN MINH. "SYNTHESIS OF ANATASE TiO2 PARTICLES AND THEIR SIZE-RELATED STRUCTURAL, OPTICAL AND RAMAN SPECTROSCOPY STUDIES." Journal of Nonlinear Optical Physics & Materials 17, no. 02 (June 2008): 167–74. http://dx.doi.org/10.1142/s0218863508004044.

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We have prepared TiO 2 anatase in powder form, studied their structure, Raman spectroscopic and optical properties in relation with the particle size. The average diameter of the particles was found by XRD pattern and SEM to be in the range of 1 μm-10 nm, depending on the synthesis condition. The effects of annealing temperature on the morphology, structural phase and particle size distribution of the particles were studied by scanning electron microscopy, X-ray diffraction, Raman spectroscopy and optical absorption techniques. The distinct changes of the measured results with respect to variations in particle size and synthesis parameter signify the promising application of the optical and Raman spectroscopy for comprehensive physical characterization of nanoparticles.

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41

Buzarovska, Aleksandra, Irena Arsova, and Ljubomir Arsov. "Electrochemical synthesis of poly(2-methyl aniline): electrochemical and spectroscopic characterization." Journal of the Serbian Chemical Society 66, no. 1 (2001): 27–37. http://dx.doi.org/10.2298/jsc0101027b.

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Poly(2-methyl aniline) or poly(ortho-toluidine), as ring substituted derivative of aniline, has been synthesized electrochemically in various concentrations of H2SO4 and HCl, and then characterized by cyclic voltammetry, as well as by impedance and Raman spectroscopy. The cyclic voltammograms of poly(o-toluidine) and poly(aniline) show that the electrochemical polymerization of these two polymers proceeds by almost identical mechanisms. The Raman spectroscopical measurements suggest that the redox reactions of poly(aniline) and poly(o-toluidine) are similar in the potential range between -0.2 and 0.7V vs. SCE. The impedance measurements showed that the conductivity of poly(o-toluidine) is an order of magnitude lower than that of the corresponding poly(aniline) form.

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42

Tománková, Zuzana, Pavel Matějka, Karel Volka, and Vladimír Král. "FT Raman Spectroscopy as a Tool for Characterization of Derivatized Silica Gel Sorbents." Collection of Czechoslovak Chemical Communications 70, no. 2 (2005): 168–77. http://dx.doi.org/10.1135/cccc20050168.

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The potential of Fourier-transform (FT) Raman spectroscopy for verification of individual steps of synthesis of new chromatographic stationary phases was studied. 3-Aminopropylated silica gel was modified with two different optically active compounds ((+)-cloprostenol, (+)-(R)-2,2'-dihydroxy-1,1'-binaphthalene-3-carboxylic acid) via amide bonds. In the next step, free silanol groups were protected with trimethylsilyl groups. The FT Raman spectroscopic results compared with the data obtained by elemental analysis enable not only qualitative verification of synthetic steps, but also a semiquantitative determination of covering of the silica gel surface by derivatization agent.

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Domes, Robert, Christian Domes, Christian R. Albert, Gerhard Bringmann, Jürgen Popp, and Torsten Frosch. "Vibrational spectroscopic characterization of arylisoquinolines by means of Raman spectroscopy and density functional theory calculations." Physical Chemistry Chemical Physics 19, no. 44 (2017): 29918–26. http://dx.doi.org/10.1039/c7cp05415g.

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Salas, P., N. Nava, C. Ángeles-Chavez, E. De la Rosa, and L. A. Díaz-Torres. "Structural and Spectroscopic Characterization of ZrO2:Eu3+ Nanoparticles." Journal of Nanoscience and Nanotechnology 8, no. 12 (December 1, 2008): 6431–36. http://dx.doi.org/10.1166/jnn.2008.18402.

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ZrO2:Eu3+ nanocrystals were prepared by the sol–gel technique. The structural and luminescence properties of europium doped zirconia with 0.5 to 2 mol% were studied by Mössbauer spectroscopy, Raman spectroscopy, X-ray diffraction (XRD), High Resolution Transmission Electron Microscopy (HRTEM) and photoluminescence (PL) under UV excitation. Structural characterization shows a crystallite size between 16 to 55 nm and monoclinic and tetragonal zirconia phases as the main crystalline structure. XRD patterns shown that the content of the active ions stabilizes the tetragonal structure of ZrO2 at 1000 °C, being 100% for 2 mol% Eu2O3 doped sample. Such results are in agreement with HRTEM and Raman spectroscopy. The Mössbauer spectra of the ZrO2:Eu3+ samples show a single peak near zero velocity which is attributed to Eu+3. Luminescence characterization shows the typical emission band centered at 595 and 611 nm. Change in the structure of such band was observed and explained in terms of crystalline phase change. The dependence between the fluorescence emission and the crystalline structure is discussed.

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Sasaki, Keiko. "Spectroscopic and Microscopic Investigation for Biohydrometallurgy." Advanced Materials Research 1130 (November 2015): 383–86. http://dx.doi.org/10.4028/www.scientific.net/amr.1130.383.

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In a process of bioleaching of sulfides, the surface of target mineral is sometimes covered with intermediates and final products to interfere the extraction of metal. Understanding characterization and formation order of secondary minerals, which are responsible for passivation, is a key to resolve the passivation. In the present article, identification of secondary minerals and intermediates in a process of bioleaching of several sulfides by X-ray photoelectron spectroscopy, Raman spectroscopy, identification of jarosite group minerals using Raman spectroscopy, and expectation of formation order of secondary minerals by SEM-EDX and TEM observation are overviewed. Direct observation of a nanodomain by TEM provided a useful information on amorphous secondary minerals. In bioleaching of arsenic-bearing copper sulfides, which are expected to be a new target in the near future, a passivation model was proposed to keep maximizing Cu recovery and minimizing As solubilization, based on combination of solid characterization with aqueous observation.

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Wen, Bao-Ying, Qing-Qi Chen, Petar M. Radjenovic, Jin-Chao Dong, Zhong-Qun Tian, and Jian-Feng Li. "In Situ Surface-Enhanced Raman Spectroscopy Characterization of Electrocatalysis with Different Nanostructures." Annual Review of Physical Chemistry 72, no. 1 (April 20, 2021): 331–51. http://dx.doi.org/10.1146/annurev-physchem-090519-034645.

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As energy demands increase, electrocatalysis serves as a vital tool in energy conversion. Elucidating electrocatalytic mechanisms using in situ spectroscopic characterization techniques can provide experimental guidance for preparing high-efficiency electrocatalysts. Surface-enhanced Raman spectroscopy (SERS) can provide rich spectral information for ultratrace surface species and is extremely well suited to studying their activity. To improve the material and morphological universalities, researchers have employed different kinds of nanostructures that have played important roles in the development of SERS technologies. Different strategies, such as so-called borrowing enhancement from shell-isolated modes and shell-isolated nanoparticle-enhanced Raman spectroscopy (SHINERS)-satellite structures, have been proposed to obtain highly effective Raman enhancement, and these methods make it possible to apply SERS to various electrocatalytic systems. Here, we discuss the development of SERS technology, focusing on its applications in different electrocatalytic reactions (such as oxygen reduction reactions) and at different nanostructure surfaces, and give a brief outlook on its development.

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Zhang, Shishu, Na Zhang, Yan Zhao, Ting Cheng, Xiaobo Li, Rui Feng, Hua Xu, Zhirong Liu, Jin Zhang, and Lianming Tong. "Spotting the differences in two-dimensional materials – the Raman scattering perspective." Chemical Society Reviews 47, no. 9 (2018): 3217–40. http://dx.doi.org/10.1039/c7cs00874k.

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Bukva, Matyas, Gabriella Dobra, Juan Gomez-Perez, Krisztian Koos, Maria Harmati, Edina Gyukity-Sebestyen, Tamas Biro, et al. "Raman Spectral Signatures of Serum-Derived Extracellular Vesicle-Enriched Isolates May Support the Diagnosis of CNS Tumors." Cancers 13, no. 6 (March 19, 2021): 1407. http://dx.doi.org/10.3390/cancers13061407.

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Investigating the molecular composition of small extracellular vesicles (sEVs) for tumor diagnostic purposes is becoming increasingly popular, especially for diseases for which diagnosis is challenging, such as central nervous system (CNS) malignancies. Thorough examination of the molecular content of sEVs by Raman spectroscopy is a promising but hitherto barely explored approach for these tumor types. We attempt to reveal the potential role of serum-derived sEVs in diagnosing CNS tumors through Raman spectroscopic analyses using a relevant number of clinical samples. A total of 138 serum samples were obtained from four patient groups (glioblastoma multiforme, non-small-cell lung cancer brain metastasis, meningioma and lumbar disc herniation as control). After isolation, characterization and Raman spectroscopic assessment of sEVs, the Principal Component Analysis–Support Vector Machine (PCA–SVM) algorithm was performed on the Raman spectra for pairwise classifications. Classification accuracy (CA), sensitivity, specificity and the Area Under the Curve (AUC) value derived from Receiver Operating Characteristic (ROC) analyses were used to evaluate the performance of classification. The groups compared were distinguishable with 82.9–92.5% CA, 80–95% sensitivity and 80–90% specificity. AUC scores in the range of 0.82–0.9 suggest excellent and outstanding classification performance. Our results support that Raman spectroscopic analysis of sEV-enriched isolates from serum is a promising method that could be further developed in order to be applicable in the diagnosis of CNS tumors.

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Ashraf, Muhammad Naeem, Muhammad Irfan Majeed, Haq Nawaz, Muhammad Adnan Iqbal, Javed Iqbal, Nida Iqbal, Ahmad Hasan, et al. "Raman spectroscopic characterization of selenium N-heterocyclic carbene compounds." Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 270 (April 2022): 120823. http://dx.doi.org/10.1016/j.saa.2021.120823.

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Pereira, Luiz Augusto Stuani, Carlos Alberto Tello Sáenz, Carlos José Leopoldo Constantino, Eduardo Augusto Campos Curvo, Airton Natanael Coelho Dias, Cleber José Soares, and Sandro Guedes. "Micro-Raman Spectroscopic Characterization of a CR-39 Detector." Applied Spectroscopy 67, no. 4 (April 2013): 404–8. http://dx.doi.org/10.1366/12-06741.

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Journal articles on the topic 'Raman spectroscopic characterization'

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