Micro Raman spectrometer

Figure 3.7. Schematic diagram of the basic layout of the apparatus typically employed in micro-Raman spectrometers, or microprobes. (From Turrell and Corset 1996.)...

W. Schabel, I. Ludwig and M. Kind, Measurements of concentration profiles in polymeric solvent coatings by means of an inverse confocal micro Raman spectrometer - Initial results. Drying Technol., 22, 285-294 (2004). 

Fig. 15.1 Simplified schematic of a set up of micro-Raman spectrometer (Reprinted Ifom [3])...

Sureau F et al (1990) An ultraviolet micro-Raman spectrometer— resonance Raman-spectroscopy within single living cells. Appl Spectrosc 44(6) 1047-1051... 

L. Quin, Z.X. Shen, S.H. Tang, M.H. Kuck, The modification of a spex spectrometer into a micro-Raman spectrometer. Asian J. Spectrosc. 1, 121 (1997)... 

The reaction product outcome was investigated by Raman spectroscopy. Raman spectroscopy is a vibrational spectroscopic technique suitable to distinguish qualitatively and quantitatively between reaction species in aqueous media. This kind of investigation is only possible with a closed loop for the electrolyte and ethanol. Additionally, a flow-through cell was inserted into the anodic electrolyte cycle using a micro-Raman spectrometer to understand the reaction mechanism better. 

An important development in Raman spectroscopy has been the coupling cf the spectrometer to an optical microscope. This allows the chemical and structural analysis described above to be applied to sample volumes only 1 across [38]. No more sample preparation is required than that for optical microscopy, and the microscope itself can be used to locate and record the area which is analyzed. This has obvious practical application to the characterization of small impurities or dispersed phases in polymer samples. This instrument, which may be called the micro-Raman spectrometer, the Raman microprobe or the Molecular Optics Laser Examiner [39] has also been applied to the study of mechanical properties in polymer fibers and composites. It can act as a non-invasive strain gauge with 1 fim resolution, and this type of work has recently been reviewed by Meier and Kip [40]. Even if the sample is large and homogeneous, there may be advantages in using the micro-Raman instrument. The microscope... 

SERS signals are detected on discharged Ag electrodes in Li/Ag cells with micro-Raman spectrometer. The successful observation of the SERS signal is attributed to the formation of nanometer Li-Ag alloy particles on the Ag electrode surface during discharge and the interaction between the electrolyte and the Ag electrode. With SERS technique, LijCOj and LiOH-HjO are determined to be the main components of the SEI layer on the Ag electrode with some moisture in the electrolyte. 

Figure 14 Raman spectra of discharged Ag electrode (A) and A1 electrode (B) in IM LiClO., PC/DMC (1 1 in v/o) electrolyte. The inset is the selected spectra of the corresponding samples. The spectra are recorded on Renishaw 1000 micro-Raman spectrometer with an excitation of 632.8 nm from a He-Ne laser.

Table 5.50 lists the main features of Raman microspectroscopy. Virtually any object which can be observed under a microscope can be analysed with Raman microscopy. Here, the usual constraints inherent in electron beam methods (vacuum, metallisation, etc.) are totally absent. Although micro-Raman spectrometers mainly use visible excitation, the confocal configuration almost eliminates fluorescence which falls outside of the focal volume. The focus area for visible lasers is <1 /xm, whereas the focus diameter for NIR lasers is 20 fim. 

F. Sureau, L. Chinsky, C. Amirand, J.P. BalUni, M. Duquesne, A. Laigle, P.Y. Turpin, P. Wgny, An ultraviolet micro-Raman spectrometer resonance Raman spectroscopy within single living cells. Appl. Spectrosc. 44, 1047-1051 (1990)... 

Raman Spectral Characterization Room temperature micro Raman spectra of synthesized nanopowders were scanned using micro Raman (STR-500 Micro-Raman Spectrometer) set up at room temperature using laser 532nm (50mW) diode laser. The spectral resolution was 1 cm. The typical Raman spectrum of CdSe nanoparticles is shown in Fig. 21. 

The crystal structure of the microwave sintered products was characterized by X-ray diffraction (XRD) using a Shimadzu X-ray diffractometer with Cu-K radiation 26 range of 20 to 80°. Raman spectra were carried out on an RM-1000 micro-Raman spectrometer with the 514.53... 

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