Comparison of seven portable Raman spectrometers: beryl as a case study

Raman microspectroscopy conducted with transportable/mobile instruments allows for the non‐invasive identification of amorphous and crystalline phases of ancient masterpieces and outstanding artworks (objects, paintings and décor, building parts, etc.). Resonance Raman spectroscopy detects chromophore and dye traces. On the basis of examples (enamelled glass and pottery, enamelled metal, patinated/corroded metal, stained glass, sculptures, paintings, pastels, and drawings), this mini review discusses the main parameters (laser and optics choice, experimental procedure, etc.) and shows how phase identification contributes to a better understanding of innovant technology exchanges.

Section: Experimental and Proceduresmentioning

confidence: 99%

On‐site Raman study of artwork: Procedure and illustrative examples

Colomban

2017

“…Other models of modern portable Raman spectrometers (with different excitation sources, allowing to obtain data from extended spectral range, or to mitigate fluorescence as in the case of the Portable Sequentially Shifted Raman spectrometer) are expected to provide better results. Such miniature Raman spectrometers were already tested for identification of minerals and other geomaterials …”

Section: Discussionmentioning

confidence: 99%

Raman spectroscopic study of six synthetic anhydrous sulfates relevant to the mineralogy of fumaroles

Košek

Culka

Jehlička

2018

Self Cite

Fumaroles, vents that emit hot gases and vapor, are an accompanying phenomenon of volcanic activity. Such phenomena are also observed within the framework of self‐ignited burning coal seams and coal heap fires, if less commonly. The high temperatures and chemical reactions between the gas and solid phases are responsible for extensive alteration of surrounding rocks, resulting in mineral encrustations of unusual compositions. Rare anhydrous sulfates (millosevichite, mikasaite, efremovite, godovikovite, sabieite, and steklite) are signature minerals of fumarole encrustations. Comprehensive Raman data for these anhydrous phases are required for the successful identification of natural samples by Raman spectroscopy. Six synthetic equivalents of the natural anhydrous sulfates were prepared by heating of the hydrated analogues and were investigated using both a bench‐top Raman microspectrometer and a portable Raman spectrometer. This comparative approach can help further steps for the successful deployments of miniature Raman tools in situ under field conditions. The studied anhydrous sulfates displayed distinctive Raman spectra of their crystalline phases. Compared with their fully hydrated counterparts, a shifting of bands of the ν1 symmetric stretching mode was observed in the Raman spectra of all samples. Isostructural millosevichite and mikasaite have very distinctive Raman spectra; however, structurally related godovikovite, sabieite, and steklite show very similar spectral shapes. For ammonium‐bearing phases (efremovite, godovikovite, sabieite), the Raman signatures of the NH4 group were observable at >2,800 cm−1 and in the 1,400–1,800 cm−1 region. Our measurements show that the performance of a light‐weight portable Raman spectrometer with near infrared excitation was sufficient for the unambiguous discrimination of the investigated sulfates.

“…All the instruments tested, EzRaman‐I Dual (Enwave Optronics), RaPort (EnSpectr), FirstGuard (Rigaku), FirstDefender XL and FirstDefender RM (Thermo Scientific), Inspector Raman (Delta Nu), and Bravo (Bruker), can be used for common gemmological and mineralogical work in situ. Two instruments (the RaPort and the sequentially shifted excitation Raman spectrometer Bravo) allow recording excellent quality Raman spectra comparable with laboratory dispersive Raman microspectrometers . Jehlicka, Culka, and Kosek described measuring Raman spectra of minerals and carbonaceous matter using a portable sequentially shifted excitation Raman spectrometer.…”

Section: Raman Techniques and Methodsmentioning

confidence: 99%

Recent advances in linear and nonlinear Raman spectroscopy. Part XII

Nafie

2018

This annual review is an overview of advances in the field of Raman spectroscopy as found in papers published in the previous calendar year in the Journal of Raman Spectroscopy (JRS), as well as in trends over the past decade across journals that have published papers important to the field of Raman spectroscopy. This information is gleaned from statistical data on article counts obtained from the Clarivate Analytic's Web of Science Core Collection by year and by subfield of Raman spectroscopy. Additional information is gleaned from presentations at the XXVI International Conference on Raman Spectroscopy (ICORS 2018) in Jeju Island, Korea in August 2018, and contributions on Raman scattering at SCIX 2018, organized by the Federation of Analytical Chemistry and Spectroscopy Societies (FACSS) in Atlanta, Georgia, USA in October 2018. Coverage is also provided for topics from the European Conference on Nonlinear Optical Spetroscopy (ECONOS 2018) held in April in Milan, Italy and GeoRaman 2018 in Catania, Italy in June. Finally, papers published in JRS in 2017 are highlighted and arranged by topics at the frontier of Raman spectroscopy. On the basis of this survey information, it is clear that Raman spectroscopy continues as in recent years as a rapidly expanding field of research across a wide range of novel disciplines and applications that provide sensitive photonic information of matter at the molecular level.