Laser sources for Raman spectroscopy

2011 ◽  
Author(s):  
J. Kilmer ◽  
A. Iadevaia ◽  
Y. Yin
Keyword(s):  
Raman Spectroscopy ◽  
Laser Sources

Photoacoustic Raman spectroscopy (PARS) using cw laser sources

1979 ◽  
Vol 34 (2) ◽  
pp. 144-146 ◽  
Author(s):  
Joseph J. Barrett ◽  
Michael J. Berry
Keyword(s):  
Raman Spectroscopy ◽  
Cw Laser ◽  
Laser Sources

scholarly journals Surface-Enhanced Raman Scattering: Introduction and Applications

2020 ◽  
Author(s):  
Samir Kumar ◽  
Prabhat Kumar ◽  
Anamika Das ◽  
Chandra Shakher Pathak
Keyword(s):  
Raman Spectroscopy ◽  
Raman Scattering ◽  
Rayleigh Scattering ◽  
Scattered Light ◽  
Monochromatic Light ◽  
Surface Enhanced Raman Scattering ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Laser Sources

Scattering of light by molecules can be elastic, Rayleigh scattering, or inelastic, Raman scattering. In the elastic scattering, the photon’s energy and the state of the molecule after the scattering events are unchanged. Hence, Rayleigh scattered light does not contain much information on the structure of molecular states. In inelastic scattering, the frequency of monochromatic light changes upon interaction with the vibrational states, or modes, of a molecule. With the advancement in the laser sources, better and compact spectrometers, detectors, and optics Raman spectroscopy have developed as a highly sensitive technique to probe structural details of a complex molecular structure. However, the low scattering cross section (10−31) of Raman scattering has limited the applications of the conventional Raman spectroscopy. With the discovery of surface-enhanced Raman scattering (SERS) in 1973 by Martin Fleischmann, the interest of the research community in Raman spectroscopy as an analytical method has been revived. This chapter aims to familiarize the readers with the basics of Raman scattering phenomenon and SERS. This chapter will also discuss the latest developments in the SERS and its applications in various fields.

scholarly journals Evaluation of Deformation Temperatures in Carbonate Mylonites at Low Temperature Thrust-Tectonic Settings via Micro-Raman Spectroscopy

Minerals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1068
Author(s):  
Alessandro Croce ◽  
Enrico Pigazzi ◽  
Patrizia Fumagalli ◽  
Caterina Rinaudo ◽  
Michele Zucali
Keyword(s):  
Raman Spectroscopy ◽  
Low Temperature ◽  
Carbonate Rocks ◽  
Carbonaceous Material ◽  
Fold Belt ◽  
Micro Raman Spectroscopy ◽  
Axial Part ◽  
Laser Sources ◽  
Tectonic Settings ◽  
532 Nm

Carbonaceous materials (CMs) have been widely used to assess temperatures in sedimentary and metamorphic carbonate rocks. The use of Raman spectroscopy of carbonaceous material (RSCM) is largely devoted to the study of deformed rocks hosted in thrust-tectonic settings. Raman spectroscopy of carbonaceous material successfully allows the study of carbonate rocks at a temperature as high as 650 °C. In this study, a set of carbonate-mylonite rocks (Italian Alps) were investigated using micro-Raman spectroscopy, in order to infer the deformation conditions associated with the Alpine thrusts, expected to occur at T < 350 °C. Micro-Raman spectra were collected using two sources: green (532 nm) and red (632.8 nm) lasers. Several deconvolution procedures and parameters were tested to optimize the collected spectrum morphologies for the laser sources, also in accordance with the low temperature expected. The obtained temperatures highlight two clusters: one at 340–350 °C for the samples collected in the axial part of the Alpine chain, and the other at 200–240 °C for those collected in the external thrust-and-fold belt. These results agree with the independent geological and petrological constraints. Consistent results were obtained using 532 and 632.8 nm laser sources when the appropriate deconvolution approach was used.

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