scholarly journals Selection of Portable Spectrometers for Planetary Exploration: A Comparison of 532 nm and 785 nm Raman Spectroscopy of Reduced Carbon in Archean Cherts

Astrobiology ◽  
2015 ◽  
Vol 15 (6) ◽  
pp. 420-429 ◽  
Author(s):  
Liam V. Harris ◽  
Ian B. Hutchinson ◽  
Richard Ingley ◽  
Craig P. Marshall ◽  
Alison Olcott Marshall ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Planetary Exploration ◽  
Portable Spectrometers ◽  
532 Nm ◽  
Selection Of

scholarly journals Use of WetSEM® capsules for convenient multimodal scanning electron microscopy, energy dispersive X-ray analysis, and micro Raman spectroscopy characterisation of technetium oxides

2021 ◽  
Author(s):  
D. J. Bailey ◽  
M. C. Stennett ◽  
J. Heo ◽  
N. C. Hyatt
Keyword(s):  
Raman Spectroscopy ◽  
Low Cost ◽  
Powder Materials ◽  
Spectroscopy Analysis ◽  
X Ray ◽  
Micro Raman Spectroscopy ◽  
Hazard And Risk ◽  
Sem Imaging ◽  
General User ◽  
532 Nm

AbstractSEM–EDX and Raman spectroscopy analysis of radioactive compounds is often restricted to dedicated instrumentation, within radiological working areas, to manage the hazard and risk of contamination. Here, we demonstrate application of WetSEM® capsules for containment of technetium powder materials, enabling routine multimodal characterisation with general user instrumentation, outside of a controlled radiological working area. The electron transparent membrane of WetSEM® capsules enables SEM imaging of submicron non-conducting technetium powders and acquisition of Tc Lα X-ray emission, using a low cost desktop SEM–EDX system, as well as acquisition of good quality μ-Raman spectra using a 532 nm laser.

Time-resolved stand-off UV-Raman spectroscopy for planetary exploration

2014 ◽  
Vol 92 ◽  
pp. 88-100 ◽  
Author(s):  
M. Skulinova ◽  
C. Lefebvre ◽  
P. Sobron ◽  
E. Eshelman ◽  
M. Daly ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Planetary Exploration ◽  
Time Resolved ◽  
Uv Raman Spectroscopy ◽  
Uv Raman

Physically Self-assembled Au Nanorod Arrays for SERS

2006 ◽  
Vol 951 ◽  
Author(s):  
Motofumi Suzuki ◽  
Kaoru Nakajima ◽  
Kenji Kimura ◽  
Takao Fukuoka ◽  
Yasushige Mori
Keyword(s):  
Raman Spectroscopy ◽  
Low Cost ◽  
Major Axis ◽  
Surface Enhanced Raman Spectroscopy ◽  
Nanorod Arrays ◽  
Au Nanorods ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Oblique Deposition ◽  
Selection Of

ABSTRACTWe have demonstrated surface-enhanced Raman spectroscopy on arrays of Au nanorods aligned in line by a dynamic oblique deposition technique. For the light polarized along the major axis of the nanorods, the plasma resonance of the Au nanorods has been tuned to a wavelength suitable for Raman spectroscopy. The Raman scattering on the discrete nanorods is enhanced significantly compared with that on semi continuous Au films. Since the preparation process is physically bottom-up, it is robust in its selection of the materials and is useful in providing the SERS sensors at low cost.

Laser Induced Oxidation Effects in Bismuth Thin Films

2012 ◽  
Vol 1477 ◽  
Author(s):  
Marco A. Zepeda ◽  
Michel Picquart ◽  
Emmanuel Haro-Poniatowski
Keyword(s):  
Thin Films ◽  
Raman Spectroscopy ◽  
Laser Irradiation ◽  
Raman Spectra ◽  
Exposure Time ◽  
Oxidation Process ◽  
Energy Dispersion Spectroscopy ◽  
Irradiation Power ◽  
Pure Bismuth ◽  
532 Nm

ABSTRACTThe Laser induced oxidation process of bismuth was investigated using Raman spectroscopy. Upon laser irradiation (λ = 532 nm) pure Bismuth was transformed gradually into Bi2O3. Raman spectra of the samples showed the characteristics peaks for pure Bi located at 71 cm-1 and 96 cm-1. The oxidation process was monitored by Raman spectra with four additional bands located at about 127 cm-1, 241 cm-1, 313 cm-1 and 455 cm-1. Maintaining constant the exposure time of irradiation, the intensity of these bands depended on laser irradiation power. The presence of Bi2O3 in the sample was confirmed through by energy dispersion spectroscopy (EDS).

Rhodium nanocubes and nanotripods for highly sensitive ultraviolet surface-enhanced Raman spectroscopy

The Analyst ◽  
2018 ◽  
Vol 143 (10) ◽  
pp. 2310-2322 ◽  
Author(s):  
Rupali Das ◽  
R. K. Soni
Keyword(s):  
Raman Spectroscopy ◽  
Surface Enhanced Raman Spectroscopy ◽  
Excitation Wavelength ◽  
Rhodium Nanoparticles ◽  
Highly Sensitive ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
532 Nm

DUV-UV (266 nm), UV (325 nm) and visible (532 nm) excitation-wavelength-dependent SERS investigation of adenine molecules on rhodium nanoparticles.

scholarly journals Mobile Raman spectroscopy in astrobiology research

2014 ◽  
Vol 372 (2030) ◽  
pp. 20140202 ◽  
Author(s):  
Peter Vandenabeele ◽  
Jan Jehlička
Keyword(s):  
Raman Spectroscopy ◽  
Data Processing ◽  
Analytical Techniques ◽  
Research Areas ◽  
Different Types ◽  
Target Molecules ◽  
Processing Techniques ◽  
Spectroscopy Research ◽  
Selection Of

Raman spectroscopy has proved to be a very useful technique in astrobiology research. Especially, working with mobile instrumentation during fieldwork can provide useful experiences in this field. In this work, we provide an overview of some important aspects of this research and, apart from defining different types of mobile Raman spectrometers, we highlight different reasons for this research. These include gathering experience and testing of mobile instruments, the selection of target molecules and to develop optimal data processing techniques for the identification of the spectra. We also identify the analytical techniques that it would be most appropriate to combine with Raman spectroscopy to maximize the obtained information and the synergy that exists with Raman spectroscopy research in other research areas, such as archaeometry and forensics.

Experimental evaluation of biological effects of 532 nm wave laser in continuous contact mode under exposure on tissues with various optical and mechanical properties

2021 ◽  
Vol 19 (2) ◽  
pp. 50-55
Author(s):  
E. K. Tikhomirova ◽  
Keyword(s):  
Mechanical Properties ◽  
Optical Properties ◽  
Biological Tissues ◽  
Careful Selection ◽  
Contact Mode ◽  
Continuous Contact ◽  
Optical And Mechanical Properties ◽  
Coagulation Zone ◽  
532 Nm ◽  
Selection Of

The study presents the results of the experimental action of laser radiation with a wavelength of 532 nm in continuous contact mode on biological tissues with different optical properties. The width of the ablation and coagulation zone, the degree of vaporization of various types of tissues were evaluated. Good coagulation properties of the laser are established when exposed to pigmented tissues. However, the pronounced color dependence characteristic of a given wavelength requires careful selection of the biological objects that are suitable for optical properties. Objectives: An experimental evaluation of the effects of a laser with a wavelength of 532 nm in a continuous contact mode on tissues with different optical and mechanical properties. Materials and methods. We carried out an experimental study of the effects of a laser with a wavelength of 532 nm in a continuous contact mode on biological tissues with different optical and mechanical properties. The crater width and side coagulation zone were measured using an operating microscope and a glass slide with a scale value of 0.1 mm. The tissue samples were weighed before and after the application of a point impact. The increase in laser power contributes to an increase in the width of the incision and the coagulation zone. A more pronounced adhesion of the tissue to the fiber end was noted when exposed to the liver tissue of cattle, which causes smaller values of the ablation zone width in comparison with the muscle tissue of the chicken and is reflected in high values of the error of the mean values. The greatest weight loss with a 2 seconds point impact at a power of 5 W was determined on the muscle tissue of the chicken. Conclusions. Good coagulation properties of the laser have been established when exposed to pigmented tissues, however, the pronounced color dependence characteristic of a given wavelength requires careful selection of the biological objects suitable for optical properties.

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