Investigation of stress and structural damage in H and He implanted Ge using micro-Raman mapping technique on bevelled samples

2011 ◽  
Vol 43 (3) ◽  
pp. 448-454 ◽  
Author(s):  
J. Wasyluk ◽  
P. V. Rainey ◽  
T. S. Perova ◽  
S. J. N. Mitchell ◽  
D. W. McNeill ◽  
...  
Keyword(s):  
Structural Damage ◽  
Mapping Technique ◽  
Raman Mapping

Evaluation of solid dispersions on a molecular level by the Raman mapping technique

2008 ◽  
Vol 361 (1-2) ◽  
pp. 12-18 ◽  
Author(s):  
Naho Furuyama ◽  
Susumu Hasegawa ◽  
Takeshi Hamaura ◽  
Shuichi Yada ◽  
Hiroaki Nakagami ◽  
...  
Keyword(s):  
Molecular Level ◽  
Solid Dispersions ◽  
Mapping Technique ◽  
Raman Mapping

scholarly journals Stress distribution in GaN nanopillars using confocal Raman mapping technique

2014 ◽  
Vol 104 (15) ◽  
pp. 151906 ◽  
Author(s):  
S. Nagarajan ◽  
O. Svensk ◽  
L. Lehtola ◽  
H. Lipsanen ◽  
M. Sopanen
Keyword(s):  
Stress Distribution ◽  
Mapping Technique ◽  
Raman Mapping ◽  
Confocal Raman

scholarly journals Quantification of Solute Composition in H2O-NaCl-CaCl2 Solutions Using Cryogenic 2D Raman Mapping

Minerals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1043
Author(s):  
Haixia Chu ◽  
Guoxiang Chi ◽  
Chunji Xue
Keyword(s):  
Raman Spectroscopy ◽  
Quantitative Analysis ◽  
Fluid Inclusions ◽  
Molar Fraction ◽  
Mapping Technique ◽  
Raman Mapping ◽  
Point Analysis ◽  
Single Inclusion ◽  
Solute Composition ◽  
Non Destructive

Various analytical techniques have been developed to determine the solution composition of fluid inclusions, including destructive, non-destructive, single-inclusion, and bulk-inclusion methods. Cryogenic Raman spectroscopy, as a non-destructive and single-inclusion method, has emerged as a potentially powerful tool of quantitative analysis of fluid inclusion composition. A method of point analysis using cryogenic Raman spectroscopy has been previously proposed to quantitatively estimate the solute composition of H2O-NaCl-CaCl2 solutions, but there are uncertainties related to heterogeneity of frozen fluid inclusions and potential bias in the processing of Raman spectra. A new method of quantitative analysis of solute composition of H2O-NaCl-CaCl2 solutions using Raman mapping technology is proposed in this study, which can overcome the problems encountered in the point analysis. It is shown that the NaCl/(NaCl + CaCl2) molar ratio of the solution, X(NaCl, m), can be related to the area fraction of hydrohalite over hydrohalite plus antarcticite, Fhydrohalite, by the equation X(NaCl, m) = 1.1435 Fhydrohalite − 0.0884, where Fhydrohalite = hydrohalite area/(hydrohalite area + antarcticite area). This equation suggests that the molar fraction of a salt component may be estimated from the fraction of the Raman peak area of the relevant hydrate. This study has established a new way of estimating solute composition of fluid inclusions using cryogenic Raman mapping technique, which may be extended to other solutions.

scholarly journals Investigation on the laser ablation of SiC ceramics using micro‐Raman mapping technique

2016 ◽  
Vol 5 (3) ◽  
pp. 253-261 ◽  
Author(s):  
Chaoli Fu ◽  
Yong Yang ◽  
Zhengren Huang ◽  
Guiling Liu ◽  
Hui Zhang ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Mapping Technique ◽  
Raman Mapping ◽  
Sic Ceramics

scholarly journals Correlation analysis of vibration modes in physical vapour deposited Bi2Se3 thin films probed by the Raman mapping technique

2021 ◽  
Author(s):  
K. A. Niherysh ◽  
J. Andzane ◽  
M. M. Mikhalik ◽  
S. M. Zavadsky ◽  
P. L. Dobrokhotov ◽  
...  
Keyword(s):  
Thin Films ◽  
Correlation Analysis ◽  
Plane Strain ◽  
Raman Mode ◽  
Mapping Technique ◽  
Vibration Modes ◽  
Deformation Potential ◽  
Raman Mapping ◽  
Out Of Plane

We propose the evaluation of strain in Bi2Se3 films based on the correlation analysis of in-plane (E2g) and out-of-plane (A21g) Raman mode positions as well as the algorithm of phonon deformation potential calculation for biaxial in-plane strain.

Evaluation of single-electron movies of glutamine synthetase molecules

1983 ◽  
Vol 41 ◽  
pp. 280-281
Author(s):  
W. Kunath ◽  
E. Zeitler ◽  
M. Kessel
Keyword(s):  
Electron Microscope ◽  
Glutamine Synthetase ◽  
Electron Irradiation ◽  
Structural Damage ◽  
Structural Changes ◽  
Single Electron ◽  
Continuous Series ◽  
Digital Recording ◽  
Recording Device ◽  
Low Exposure

The features of digital recording of a continuous series (movie) of singleelectron TV frames are reported. The technique is used to investigate structural changes in negatively stained glutamine synthetase molecules (GS) during electron irradiation and, as an ultimate goal, to look for the molecules' “undamaged” structure, say, after a 1 e/Å2 dose.The TV frame of fig. la shows an image of 5 glutamine synthetase molecules exposed to 1/150 e/Å2. Every single electron is recorded as a unit signal in a 256 ×256 field. The extremely low exposure of a single TV frame as dictated by the single-electron recording device including the electron microscope requires accumulation of 150 TV frames into one frame (fig. lb) thus achieving a reasonable compromise between the conflicting aspects of exposure time per frame of 3 sec. vs. object drift of less than 1 Å, and exposure per frame of 1 e/Å2 vs. rate of structural damage.

Temperature Dependence of the Critical Electron Dose for Fatty Acid Monolayers

1982 ◽  
Vol 40 ◽  
pp. 78-79
Author(s):  
Kenneth H. Downing ◽  
Robert M. Glaeser
Keyword(s):  
Electron Beam ◽  
Fatty Acid ◽  
Inelastic Scattering ◽  
Temperature Dependence ◽  
Structural Damage ◽  
Direct Result ◽  
Second Step ◽  
Strong Temperature Dependence ◽  
Electron Dose ◽  
Covalent Bonds

The structural damage of molecules irradiated by electrons is generally considered to occur in two steps. The direct result of inelastic scattering events is the disruption of covalent bonds. Following changes in bond structure, movement of the constituent atoms produces permanent distortions of the molecules. Since at least the second step should show a strong temperature dependence, it was to be expected that cooling a specimen should extend its lifetime in the electron beam. This result has been found in a large number of experiments, but the degree to which cooling the specimen enhances its resistance to radiation damage has been found to vary widely with specimen types.

Modification of the Electron Microscope for Investigation of Fully Hydrated Biological Specimens

1969 ◽  
Vol 27 ◽  
pp. 418-419 ◽  
Author(s):  
R. C. Moretz ◽  
D. F. Parsons
Keyword(s):  
Electron Beam ◽  
Electron Microscope ◽  
Structural Damage ◽  
Lower Percentage ◽  
Vacuum Drying ◽  
Total Removal ◽  
Total Absence ◽  
Biological Studies ◽  
Electron Microscopes ◽  
Beam Damage

Short lifetime or total absence of electron diffraction of ordered biological specimens is an indication that the specimen undergoes extensive molecular structural damage in the electron microscope. The specimen damage is due to the interaction of the electron beam (40-100 kV) with the specimen and the total removal of water from the structure by vacuum drying. The lower percentage of inelastic scattering at 1 MeV makes it possible to minimize the beam damage to the specimen. The elimination of vacuum drying by modification of the electron microscope is expected to allow more meaningful investigations of biological specimens at 100 kV until 1 MeV electron microscopes become more readily available. One modification, two-film microchambers, has been explored for both biological and non-biological studies.

Confocal Raman mapping

1992 ◽  
Vol 50 (2) ◽  
pp. 1514-1515
Author(s):  
J. Barbillat ◽  
M. Delhaye ◽  
P. Dhamelincourt
Keyword(s):  
Chemical Species ◽  
Diffraction Limit ◽  
Microscopic Level ◽  
Raman Mapping ◽  
Complete Spectrum ◽  
Laser Illumination ◽  
Ccd Detector ◽  
Raman Microprobe ◽  
Photodiode Array ◽  
Raman Image

Raman mapping, with a spatial resolution close to the diffraction limit, can help to reveal the distribution of chemical species at the surface of an heterogeneous sample.As early as 1975,three methods of sample laser illumination and detector configuration have been proposed to perform Raman mapping at the microscopic level (Fig. 1),:- Point illumination:The basic design of the instrument is a classical Raman microprobe equipped with a PM tube or either a linear photodiode array or a two-dimensional CCD detector. A laser beam is focused on a very small area ,close to the diffraction limit.In order to explore the whole surface of the sample,the specimen is moved sequentially beneath the microscope by means of a motorized XY stage. For each point analyzed, a complete spectrum is obtained from which spectral information of interest is extracted for Raman image reconstruction.- Line illuminationA narrow laser line is focused onto the sample either by a cylindrical lens or by a scanning device and is optically conjugated with the entrance slit of the stigmatic spectrograph.

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