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[en] The micro-Raman spectra of four oxides of uranium are presented and discussed. Attention is drawn to certain features and trends of the spectra which lead to their use in the characterisation of uranium oxide particles. Much lower laser powers than are normally used for Raman measurements have proved possible because of the high collection efficiency of the microscope optics and the multiscanning capability of the spectrometer. Raman spetra can now be obtained for materials earlier thought to be too unstable to survive the long periods of continuous radiation necessary. (orig.)
[en] A new approach to identify the vibrational modes in Stokes Raman spectrum of triclinic crystal is presented. It is different from the method already established in that band intensities in several illumination-observation geometries are compared and classified according to their relative intensity patterns. This method provides advantages of identifying the bands with weak Raman activities. A single crystal of 9-Methyfluoren-9-ol was used to demonstrate this method.
[en] In our paper, we reported a previously unobserved Raman-like band centered at around 550 cm-1 and found that it diminished after the material degraded. This erratatum provides a more accurate interpretation; the wrong interpretation does not affect the primary conclusion.
[en] Measurements of water as the most available and vitally important element were performed using the laser confocal scanning microscope with the purpose of extending the range of its application. In this work, the measured Raman spectra of water obtained for different water samples—unprocessed, purified, and mineral, in different phase states, and after filtration and processing using different methods—are presented.
[en] The poster includes sections on the overview and relevance of the project, a project summary, relevance, accomplishments, collaborations, remaining challenges and barriers and. proposed future work.
[en] Raman scattering was measured using X-ray CrKβ radiation in amorphous boron for a scattering angle 45 deg and with a new type graphite spectrometer without collimators. Two energy shifts from the primary line were observed, one at a distance of 193 eV, which is ascribed to the Raman band, and the other at a distance of 183 eV, which is ascribed to the 1s-2p transition. (author)
[en] Raman spectroscopy (largely because of advances in laser and detector technology) is assuming a rapidly expanding role in many areas of research. This paper reviews the contribution of Raman spectroscopy in high temperature chemistry including molecular spectroscopy on static systems and gas diagnostic measurements on reactive systems. An important aspect of high temperature chemistry has been the identification and study of the new, and often unusual, gaseous molecules which form at high temperatures. Particularly important is the investigation of vibrational-rotational energy levels and electronic states which determine thermodynamic properties and describe chemical bonding. Some advantages and disadvantages of high temperature Raman spectrosocpy for molecular studies on static systems are compared: (1) Raman vs infrared; (2) gas-phase vs condensed in matries; and (3) atmospheric pressure Raman vs low pressure techniques, including mass spectroscopy, matrix isolation, and molecular beams. Raman studies on molecular properties of gases, melts, and surfaces are presented with emphasis on work not covered in previous reviews of high temperature and matrix isolation Raman spectroscopy