Micro Raman spectra

Fig. 19.2. Micro-Raman spectra of different single bacterial cells normal bacterial Raman spectrum of Staph, wameri compared to Raman spectra with enhanced amounts of subcellular components calcium dipicolinate for a spore of B. pumilus polyhydroxy butyric acid (PHB) in B. megaterium cytochrome in Staph, cohnii and sarcina xanthin in M. luteus...

Fig. 19.3. Representative micro-Raman spectra of single bacterial cells belonging to different species and strains that are predominantly present in pharmaceutical production in case of microbial contamination...

Fig. 3.7. Polarized micro-Raman spectra of a (0001) ZnO bulk sample (a) and a (0001) ZnO thin film (d 1,970 nm) on (0001) sapphire (b). The vertical dotted and dashed lines mark ZnO and sapphire (S) phonon modes, respectively. MP denotes modes due to multi-phonon scattering processes in ZnO. Excitation with Ar+-laser line A = 514.5 nm and laser power P < 40 mW. Reprinted with permission from [38]...

Delhaye and Dhamelincourt (1975) were the first to combine a Raman spectrometer with a microscope. Kiefer (1988) described the Raman spectroscopy of single particles of aerosols by the optical levitation technique, an approach which is even possible with a compact spectrometer (Hoffmann et al., 1992). Raman spectra recorded with NIR FT Raman microscopes have proven the value of this technique (Messerschmidt and Chase, 1989 Bergin and Shurwell, 1989 Simon and Sawatzki, 1991). Examples of micro Raman spectra obtained from different spots on certain biological samples have been published (Schrader, 1990 Puppels et al., 1991). 

Fig. 14.10 Room-temperature micro-Raman spectra of CoFe204 synthesized at Co metal ion concentrations of (a) 0.4, (b) 0.1, (c) 0.05, and (d) 0.025 M (Reprinted with permission from Ref. [47]. Copyright American Chemical Society (2010))...

There exists a significant variation in the micro-Raman spectra in depth, as shown in Figure 11.46, Each spectrum can be deconvoluted by Lorenzian band shapes, where the peak positions were located at 1332, 1335, and 1341 cm. ... 

The micro-Raman spectra of GaAs nanoparticles include a characteristic feature at about 250 cm-1.147 The hydrogen-plasma treatment of GaAs has been probed by Raman spectroscopy. Characteristic bands were seen due to H2 trapped at different types of site.148 DFT calculations gave vibrational wave-numbers for the cluster Ga8As8.149... 

Low-wavenumber Raman bands of MWCNT were assigned in terms of modes from coupling of radial breathing modes of individual tubes via van der Waals interactions.279 The Raman spectra of MWCNT prepared at 470°C showed the coexistence of graphite and amorphous carbon units.280 Micro-Raman spectra were used to characterise 13C-labelled MWCNT.281 The Raman spectra of MWCNT s subjected to plasma-etching were used to identify structural defects introduced thereby.282 Raman spectroscopy was used to compare the structures of MWCNT s prepared by high-temperature arc and low-temperature CVD methods. The former had a more graphite-like structure.283 Micro-Raman spectroscopy was used to characterise MWCNT obtained by electrophoretic deposition.284... 

Pressure-induced phase transformations for anatase-Ti02 were monitored by Raman spectroscopy.40 Raman spectroscopy was used to characterise rutile titania nanocrystalline particles with high specific surface areas.41 Micro-Raman spectra were used to follow surface transformations induced by excimer laser irradiation of Ti02.42 There was Raman spectroscopic evidence for modification of a titania surface by attached gold nanoparticles.43... 

Figure 7.4 Typical micro-Raman spectra from different microscopic objects in induction plasma-sprayed titania coatings, (a) Anatase precursor powder, (b) anatase-rich coating particle, (c) rutile-rich coating particle and (d) molten splat (Burlacov et ai, 2006).

Chinese hamster lung cells) have been obtained by means of Micro-Raman spectroscopy The Micro-Raman spectra of these chromosomes exhibited significant Raman bands which could be assigned to the DNA or to the protein contents of the chromosomes. 

Figure 1. (a) Micro-Raman spectra of Si-matrix with buried and unburied layers in it, taken in backscattering geometry, (b) Raman spectra of samples with buried and unburied layers, taken in near perpendicular geometry. The configurations are shown in the insets of the figures. 

The micro-Raman spectra (Fig. la) were measured by a triple multichannel spectrometer Microdil 28 (Dilor) equipped with an optical microscope (objective xlOO and numerical aperture NA=0.95) for focusing the incident laser beam (Ar+ laser, X=488.O nm, PL 10 mW, focus spot diameter of about 2 pm). The scattered light was collected in a backscattering configuration (A). 

Pig. 23. Micro-Raman spectra of PVF2 recorded in the transition zone at positions A, B, C, and D (191). 

Fig. 25. Microspectroscopic studies of polyethylene and poly(ethylene terephthalate) laminate (A) optical of micrograph (B) micro-infrared spectra of the components obtained (left PE, right PET) (C) micro-Raman spectra obtained (top PE, bottom PET) (193).

Polarised micro-Raman spectra of aligned carbon SWNTs show that a distinction can be made between metallic and semiconducting SWNTs. The Raman band near 1580 cm is an intrinsic feature of metallic SWNTs. Calculations suggest that all achiral carbon SWNTs possess only eight Raman- and three IR-active modes. All chiral SWNTs were suggested to have fourteen Raman- and six IR-active modes. ... 

Figure 21 Micro-Raman spectra obtained from annealed a-Geo 760)24 films. Only the region of...

Figure 4.10 Top Photomicrograph of unstained cervical tissue section, with different cell types identified. Bottom Micro-Raman spectra recorded from basal cells (A), epithelial cells (B), and connective tissue (C) in cervical tissue sections. The main spectral features associated with each cell type are highlighted.

Figure 4.13 Photomicrography showing a single hve cancer cell growing on a quartz window and the cellular compartments such as the nucleus and cytoplasm. Micro-Raman spectra corresponding to these compartments measured with an xlOO water immersion objective, 50 mW of a 785 nm laser, and a collection time of 20 s. (Courtesy of F. Draux.)...

Figure 4. Conventional micro-Raman spectra of individual bacillus spores (a). The spectra are nearly identical due to the large content of calcium dipicolinate in the core of the spores. When silver nanoparticles are adsorbed to the surface of the spores (b), the spectra change significantly. The spectra are no longer dominated by the calcium dipicolinate (dashed lines).

Raman spectra with UV excitation of tetrahedral amorphous carbon contain bands near 1100 cm" and 1600 cm due to sp and sp hybridised carbon respectively. Micro-Raman spectra were used to study carbon-based thin films obtained from camphor soot. There was evidence for diamond-like structures, graphite-like forms and tetrahedrally-coordinated carbon of the camphor soot. ... 

Figure 9.18 Backscattering micro-Raman spectra from o-plane QD sample, obtained for three polarization configurations under 2.41 eV (514.5 nm) excitation. The z direction coincides with the c axis of the wurtzite structure. The asterisk refers to features attributed to the substrate. (Reprinted figure with permission from Garro, N., Cros, A., Budagosky, J.A. et al. (2005) Applied Physics Letters, 87,011101. Copyright 2005 by the American Institute of Physics.)...

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. 

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