scholarly journals From Micro– to Macro–Raman Spectroscopy: Solar Silicon for a Case Study

10.5772/48143 ◽  
2012 ◽  
Author(s):  
George Sarau ◽  
Arne Bochmann ◽  
Renata Lewandowska ◽  
Silke Christianse
Keyword(s):  
Raman Spectroscopy ◽  
Solar Silicon

scholarly journals Raman investigation of corrosion products on Roman copper-based artefacts

ACTA IMEKO ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 129
Author(s):  
Leila Es Sebar ◽  
Leonardo Iannucci ◽  
Yuval Goren ◽  
Peter Fabian ◽  
Emma Angelini ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Principal Components Analysis ◽  
Principal Components ◽  
Roman Period ◽  
Corrosion Products ◽  
Beer Sheva ◽  
Chemometric Technique ◽  
Components Analysis ◽  
Main Components

<p class="Abstract">This paper illustrates a case study related to the characterisation of corrosion products present on recently excavated artefacts. The archaeological findings, from the Rakafot 54 site (Beer-Sheva, Israel), consist of 23 coins and a pendant, all dating back to the Roman period. Raman spectroscopy was used to identify the corrosion products that compose the patina covering the objects. To facilitate and support their identification, spectra were then processed using principal components analysis. This chemometric technique allowed the identification of two main compounds, classified as atacamite and clinoatacamite, which formed the main components of the patinas. The results of this investigation can help in assessing the conservation state of artefacts and defining the correct restoration strategy.</p>

scholarly journals Advantages and disadvantages of Raman spectroscopy in testing paper banknotes

2019 ◽  
Vol 13 (3) ◽  
pp. 226-229 ◽  
Author(s):  
Gordana Jauković
Keyword(s):  
Physical Chemistry ◽  
Raman Spectroscopy ◽  
Wave Length ◽  
Raman Signal ◽  
Raman Spectrometer ◽  
Advantages And Disadvantages ◽  
Private Collection ◽  
Spectrum Characteristic

This paper presents advantages and disadvantages of Raman spectroscopy when used for testing banknotes, i.e. in case study I, 1 and 5 dinars banknotes from a private collection dating from 1876 of numismatic value were analyzed, and in case study II, 1000 dinars banknote from circulation together with its counterfeit. In both cases banknotes were analyzed by using Raman spectrometer DXR Raman microscope at the Faculty of Physical Chemistry, with a laser of wave-length 780 nm at 12 mW of power. Specters were recorded under microscope using 50X lens in a range 1800-60 cm-1. Analyses from case study I on both specimens showed spectrum characteristic for fluorescence appearance, therefore intensive signal of fluorescence covered Raman signal. In case study II, it was established that Raman spectroscopy can reliably detect a counterfeit banknote. Research, comparisons and analyses regarding original and counterfeit 1000 dinars note were performed on red banknote surfaces.

scholarly journals Early Warning of Biological Threats via Surface-Enhanced Raman Spectroscopy: A Case Study of Bacillus Spores

Challenges ◽  
2016 ◽  
Vol 7 (2) ◽  
pp. 24
Author(s):  
Antonia Lai ◽  
Salvatore Almaviva ◽  
Valeria Spizzichino ◽  
Domenico Luciani
Keyword(s):  
Raman Spectroscopy ◽  
Early Warning ◽  
Surface Enhanced Raman Spectroscopy ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Bacillus Spores

scholarly journals BEACHROCKS CEMENT CHARACTERISTICS AND CONDITIONS OF FORMATION. CASE STUDY PLATANIAS BEACH, CHANIA, GREECE

2017 ◽  
Vol 50 (1) ◽  
pp. 458
Author(s):  
A. Petropoulos ◽  
I. Baziotis ◽  
Ch. Anagnostou ◽  
N. Evelpidou
Keyword(s):  
Electron Microscopy ◽  
Raman Spectroscopy ◽  
Optical Microscopy ◽  
Secondary Electron ◽  
Coastal Sediment ◽  
Intertidal Area ◽  
Cement Material

Beachrocks represents a coastal deposition in the intertidal area, and studying their properties may lead to create a model which identifies the conditions of their formation (paleo-environment). This paper focuses most intently on the cement material which is able to recover the paleo-environment conditions during diagenesis of such coastal sediment. We used optical microscopy, secondary electron microscopy and Raman Spectroscopy to characterize the cement texture, mineralogy and chemistry in the beachrocks. The existence of pure calcite primarily controlled by the meteorite water, while Mg-calcite appears between the lowermeteoric and the upper marine phreatic zone. Finally, the presence of aragonite associated with the marine phreatic to lower marine vadose environment.

scholarly journals Hydrothermal-to-metasomatic overprint of the neovolcanic rocks evidenced by composite apatite crystals: a case study from the Maglovec Hill, Slanské vrchy Mountains, Slovakia

2018 ◽  
Vol 69 (5) ◽  
pp. 439-452
Author(s):  
Noemi Mészárosová ◽  
Roman Skála ◽  
Šárka Matoušková ◽  
Petr Mikysek ◽  
Jakub Plášil ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Trace Elements ◽  
Analytical Approach ◽  
Scattered Electron ◽  
Composition And Structure ◽  
Different Populations ◽  
The City ◽  
Unique Chemical ◽  
Hydroxyl Band

Abstract The apatite assemblage from Maglovec hill (Slanské vrchy Mountains near the city of Prešov) from fissures of hydrothermally altered neovolcanic rocks (andesites and related lithologies) was studied. The assemblage consists of two different morphological apatite types (apatite in cores of prismatic crystals and fibrous apatite mantling these cores). The assemblage was investigated by a multi-analytical approach to reveal its unique chemical composition and structure. Both types of apatite display zoning visible in back-scattered electron (BSE) images. Core apatite is relatively homogenous with porous rims appearing darker in the BSE images at the contact with fibrous apatite, and occasionally with darker regions along fractures. These parts are depleted in trace elements, mostly in LREE. Fibrous apatites display concentric and/or patchy zoning. Dark regions in fibrous apatite occasionally display a porous structure. In part of fibrous crystals, substitution of (CO3)2− for phosphorus is confirmed by Raman spectroscopy by the presence of a band at ~ 1071 cm−1. This method also confirmed the presence of OH in different populations in the structure of all apatite types. The three most important observed peaks are caused by vibrations of hydroxyls influenced by different adjacent anions: hydroxyl (band at ~ 3575 cm−1); fluorine (band at ~ 3535–3540 cm−1); chlorine (band at ~ 3494 cm−1). In REE-depleted parts of both apatite types, fine inclusions of monazite and rarely Th-rich silicate are observed. The acquired data suggest a hydrothermal origin of this assemblage and indicate a formation sequence of distinct apatite types. Moreover, minerals from the epidote group were identified, which have not been described from this locality before as well as vanadium-rich magnetites that form exsolution lamellae in ilmenite grains.

A case study: effect of defects in CVD-grown graphene on graphene enhanced Raman spectroscopy

RSC Advances ◽  
2015 ◽  
Vol 5 (77) ◽  
pp. 62772-62777 ◽  
Author(s):  
Jong-Chul Yoon ◽  
Pradheep Thiyagarajan ◽  
Hyo-Jin Ahn ◽  
Ji-Hyun Jang
Keyword(s):  
Raman Spectroscopy ◽  
Signal Enhancement ◽  
Grown Graphene

PMMA-transferred graphene provides much larger GERS signal enhancement than TRT-transferred graphene.

Non-targeted detection of milk powder adulteration using Raman spectroscopy and chemometrics: melamine case study

2016 ◽  
Vol 34 (2) ◽  
pp. 170-182 ◽  
Author(s):  
Sanjeewa R. Karunathilaka ◽  
Samantha Farris ◽  
Magdi M. Mossoba ◽  
Jeffrey C. Moore ◽  
Betsy Jean Yakes
Keyword(s):  
Raman Spectroscopy ◽  
Milk Powder ◽  
Targeted Detection
Sign in / Sign up

Export Citation Format

Share Document