Download or read book Ultraviolet Resonance Hyper Raman and Raman Scattering as a Study of Electronic Structure of Polyatomic Molecules written by Christopher Claude Bonang and published by . This book was released on 1993 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Resonance Hyper raman Characterization of Nonlinear Chromophores written by Christopher Bennett Milojevich and published by . This book was released on 2013 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hyper-Raman spectroscopy is a nonlinear optical probe which can be used to explore the multi-photon properties of molecules. Three studies are presented in this dissertation. The first study is a combined experimental investigation of the surfaceenhanced hyper-Raman scattering with a theoretical study of the electronic states of the Rhodamine 6G molecule. This study demonstrates that hyper-Raman spectroscopy can be used to probe electronic states which are one-photon inaccessible. The second study involves a comparison of experimentally measured resonance hyper-Raman spectra to first-principles calculations of the resonance hyper-Raman scattering. This study shows the utility of coupling hyper-Raman spectroscopy and hyper-Raman calculations to define the multi-photon properties of the molecule. The final study compares the experimentally collected surface-enhanced hyper-Raman spectra of Rhodamine 6G to the theoretical simulations of the resonance hyper-Raman for identical excitation energies. In this study, the mechanism of vibronic coupling in the hyper-Raman effect is fully explained, demonstrating the capability of hyper-Raman spectroscopy predicting the two-photon absorption mechanism.
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1994 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Vibrational Spectra and Structure of Polyatomic Molecules written by Ta-you Wu and published by . This book was released on 1946 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Computational Electrodynamics and Second Hyper Raman Scattering written by Philip Dwaine Simmons (Jr.) and published by . This book was released on 2015 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface-enhanced second hyper-Raman spectroscopy is a type of nonlinear light scattering in which three photons are simultaneously annihilated to produce one photon whose color is slightly shifted from its third harmonic. This process, while incredibly weak, can be magnified by many orders of magnitude with the aid of plasmonic substrates. In this dissertation, three different studies are presented probing both the nature of plasmonics and nonlinear Raman scattering. In the first, nanoparticle aggregates were dosed with two isotopologues of Rhodamine 6G to determine single-molecule activity. Plasmon maps of the aggregates were then generated from electron energy-loss spectroscopy (EELS) and 3D computational electrodynamics simulations. The results from this study suggest that electron beam excitation of the single molecule hot spot is only possible when the electron beam from the scanning transmission electron microscope (STEM) is located outside the junction region. In the second study, the Fano interferences between localized surface plasmon resonances (LSPRs) of single silver nanocubes were probed using dark-field optical microscopy, EELS, and computational electrodynamics. From this study, it was shown that hybrid plasmon modes induced from an electron beam are the same as those produced by resonance-Rayleigh scattering from individual nanocubes. In the third study, silver colloids were dosed with Rhodamine 6G and tested for second hyper-Raman scattering (2HRS) by laser illumination. Simulations of this scattering mechanism were extended from previous vibronic coupling models based on the time-dependent wavepacket approach. This work showed the incredible enhancement factors required for 2HRS and that the scattering mechanism for 2HRS followed the same A-term mechanism as normal surface enhanced Raman scattering (SERS).
Download or read book Ultraviolet Resonance Raman Investigations of Excited State Structure and Dynamics of L 3 dienes written by Mark Oluf Trulson and published by . This book was released on 1987 with total page 682 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Laboratory Directed Research and Development written by Lawrence Livermore National Laboratory and published by . This book was released on 1990 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Surface Enhanced Raman Scattering written by Richard Chang and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the course of the development of surface science, advances have been identified with the introduction of new diagnostic probes for analytical characterization of the adsorbates and microscopic structure of surfaces and interfaces. Among the most recently de veloped techniques, and one around which a storm of controversy has developed, is what has now been earmarked as surface enhanced Raman scattering (SERS). Within this phenomenon, molecules adsorbed onto metal surfaces under certain conditions exhibit an anomalously large interaction cross section for the Raman effect. This makes it possible to observe the detailed vibrational signature of the adsorbate in the ambient phase with an energy resolution much higher than that which is presently available in electron energy loss spectroscopy and when the surface is in contact with a much larger amount of material than that which can be tolerated in infrared absorption experiments. The ability to perform vibrational spectroscopy under these conditions would lead to a new understanding about the chemical identity, geome try, and bonding of adsorbed material at a level previously unacces sible. It is for these reasons that the last few years have brought an explosion of activity surrounding the exploitation of SERS. The search for the origines) of the anomalous enhancement has given rise to a research sub-activity of its own. Efforts to explain the en hancement have led to an increased understanding of the whole range of phenomena associated with the interaction of photons with adsor bates and metal surfaces.
Download or read book Ultraviolet Raman Scattering Studies and Vibronic Calculations of Benzene and Some Derivatives written by Lawrence David Ziegler and published by . This book was released on 1978 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book U S Government Research Development Reports written by and published by . This book was released on 1966 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Surface Enhanced Raman Scattering written by Katrin Kneipp and published by Springer Science & Business Media. This book was released on 2006-06-21 with total page 473 pages. Available in PDF, EPUB and Kindle. Book excerpt: Almost 30 years after the first reports on surface-enhanced Raman signals, the phenomenon of surface-enhanced Raman scattering (SERS) is now well established. SERS gained particular interest after single-molecule Raman spectroscopy had been demonstrated. This book summarizes and discusses present theoretical approaches that explain the phenomenon of SERS and reports on new and exciting experiments and applications of the fascinating spectroscopic effect.
Download or read book Raman Spectroscopy An Intensity Approach written by Guozhen Wu and published by World Scientific. This book was released on 2016-08-18 with total page 225 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book summarizes the highlights of our work on the bond polarizability approach to the intensity analysis. The topics covered include surface enhanced Raman scattering, Raman excited virtual states and Raman optical activity (ROA). The first chapter briefly introduces the Raman effect in a succinct but clear way. Chapter 2 deals with the normal mode analysis. This is a basic tool for our work. Chapter 3 introduces our proposed algorithm for the Raman intensity analysis. Chapter 4 heavily introduces the physical picture of Raman virtual states. Chapter 5 offers details so that the readers can have a comprehensive idea of Raman virtual states. Chapter 6 demonstrates how this bond polarizability algorithm is extended to ROA intensity analysis. Chapters 7 and 8 offer details on ROA, showing many findings on ROA mechanism that were not known or neglected before. Chapter 9 introduces our proposed classical treatment on ROA which, as combined with the results from the bond polarizability analysis, leads to a comprehensive physical picture for the Raman effect. In particular, this classical treatment unifies ROA and VCD (vibrational circular dichroism) on equal footing. In each section, Comments summarize the key ideas and their evaluation. This will help the readers to capture the core ideas of the presentations.
Download or read book Raman Scattering written by V. S. Gorelik and published by SPIE-International Society for Optical Engineering. This book was released on 2000 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Vibrational Spectra and Structure of Polyatomic Molecules written by Wu Ta-you and published by . This book was released on 2013-03 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Rayleigh and Raman Scattering written by George Placzek and published by . This book was released on 1959 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Light and Matter Id Licht und Materie Id written by H. Bilz and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 614 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dynamical properties of solids have recently attracted renewed interest in connection with the increasing understanding of phase transitions and re lated phenomena. In particular, soft modes or, more generally, phonon 'anom alies' seem to play an important role in structural and electronic phase tran sitions, such as ferroelectric or superconducting transitions. The understanding of the mechanisms responsible for the occurrence of unusually low frequencies in phonon spectra requires a detailed analysis of the microscopic forces governing the lattice vibrations. Of particular importance is the influence of the electron lattice interaction in the adiabatic approximation which in many cases is the origin of peculiarities in the phonon self-energy. In this work the vibrational spectra of pure non-metals and of those con taining point defects are investigated. ' In these materials the interrelation be tween the pseudo-harmonic forces (determining the phonon dispersion re lations) and the non-linear anharmonic and electron-phonon forces (as they act in infrared and Raman spectra) is most obvious and can be quantitatively analysed in terms of appropriate models. The main task is to arrive at a physically correct treatment of electronic degrees of freedom, as for example in an electronic 'shell' model, which leads to the description of phonon spectra in terms of long-range polarizabilities and short-range deformabilities. The pur pose of our review is to stimulate further investigations which, we hope, will result in explicit relations between the parameters of the semi-microscopic models and the matrix elements from the electronic band structure.
Download or read book Raman Scattering on Emerging Semiconductors and Oxides written by Zhe Feng and published by CRC Press. This book was released on 2024-09-16 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: Raman Scattering on Emerging Semiconductors and Oxides presents Raman scattering studies. It describes the key fundamental elements in applying Raman spectroscopies to various semiconductors and oxides without complicated and deep Raman theories. Across nine chapters, it covers: • SiC and IV-IV semiconductors, • III-GaN and nitride semiconductors, • III-V and II-VI semiconductors, • ZnO-based and GaO-based semiconducting oxides, • Graphene, ferroelectric oxides, and other emerging materials, • Wide-bandgap semiconductors of SiC, GaN, and ZnO, and • Ultra-wide gap semiconductors of AlN, Ga2O3, and graphene. Key achievements from the author and collaborators in the above fields are referred to and cited with typical Raman spectral graphs and analyses. Written for engineers, scientists, and academics, this comprehensive book will be fundamental for newcomers in Raman spectroscopy. Zhe Chuan Feng has had an impressive career spanning many years of important work in engineering and tech, including as a professor at the Graduate Institute of Photonics & Optoelectronics and Department of Electrical Engineering, National Taiwan University, Taipei; establishing the Science Exploring Lab; joining Kennesaw State University as an adjunct professor, part-time; and at the Department of Electrical and Computer Engineering, Southern Polytechnic College of Engineering and Engineering Technology. Currently, he is focusing on materials research for LED, III-nitrides, SiC, ZnO, other semiconductors/oxides, and nanostructures and has devoted time to materials research and growth of III-V and II-VI compounds, LED, III nitrides, SiC, ZnO, GaO, and other semiconductors/oxides. Professor Feng has also edited and published multiple review books in his field, alongside authoring scientific journal papers and conference/proceeding papers. He has organized symposiums and been an invited speaker at different international conferences and universities. He has also served as a guest editor for special journal issues.
