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Time Resolved Coherent Anti Stokes Raman Spectroscopy Cars And The Measurement Of Vibrational Spectra In Shock Compressed Molecular Materials
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Book Synopsis Time-resolved Coherent Anti-Stokes Raman Spectroscopy (CARS) and the Measurement of Vibrational Spectra in Shock-compressed Molecular Materials by :
Download or read book Time-resolved Coherent Anti-Stokes Raman Spectroscopy (CARS) and the Measurement of Vibrational Spectra in Shock-compressed Molecular Materials written by and published by . This book was released on 1990 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present the use of coherent anti-Stokes Raman scattering (CARS) in conjunction with a two-stage light-gas gun to obtain vibrational spectra of shock-compressed liquid N2, O2, CO, and their mixtures. The experimental spectra are compared to spectra calculated using a semiclassical model for CARS intensities to obtain vibrational frequencies, peak Raman susceptibilities, and linewidths. The derived spectroscopic parameters suggest thermal equilibrium of the vibrational populations is established in less than a few nanoseconds after shock passage. Vibrational temperatures obtained are compared to those derived from equation-of-state calculations. Shifts in the vibrational frequencies reflect the influence of increased density and temperature on the intramolecular motion. 11 refs., 5 figs.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1992 with total page 1572 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Coherent Anti-Stokes Raman Spectroscopy of Shock-compressed Liquid Oxygen by :
Download or read book Coherent Anti-Stokes Raman Spectroscopy of Shock-compressed Liquid Oxygen written by and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Vibrational spectra of liquid oxygen, shock compressed to several high-pressure/high-temperature states, were obtained using single- pulse multiplex coherent anti-Stokes Raman scattering (CARS). The experimental spectra were compared to synthetic spectra calculated using a semiclassical model for the CARS intensities and best fit vibrational frequencies, peak Raman susceptibilities, and Raman linewidths. Up to the maximum shock pressure of 9.6 GPa, the vibrational frequencies were found to increase monotonically with pressure. An empirical fit, which could be used as a pressure/temperature/frequency calibration standard, showed that the Raman frequency shifts could be accurately described by linear pressure and temperature dependences. Above /approx/9 GPa, the liquid oxygen opacity at 632.8 nm increased rapidly, presumably because of proximity (collision)-induced absorption. Calculations showed that the induced absorption did not resonantly enhance the CARS spectra, but did attenuate the laser beams and the CARS signals. 33 refs., 2 figs., 1 tab.
Book Synopsis Molecular Spectroscopy of Dynamically Compressed Materials by : David S. Moore
Download or read book Molecular Spectroscopy of Dynamically Compressed Materials written by David S. Moore and published by Springer Nature. This book was released on 2022-07-04 with total page 243 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers historical and state-of-the-art molecular spectroscopy methods and applications in dynamic compression science, aimed at the upcoming generation in physical sciences involved in studies of materials at extremes. It begins with addressing the motivation for probing shock compressed molecular materials with spectroscopy and then reviews historical developments and the basics of the various spectroscopic methods that have been utilized. Introductory chapters are devoted to fundamentals of molecular spectroscopy, overviews of dynamic compression technologies, and diagnostics used to quantify the shock compression state during spectroscopy experiments. Subsequent chapters describe all the molecular spectroscopic methods used in shock compression research to date, including theory, experimental details for application to shocked materials, and difficulties that can be encountered. Each of these chapters also includes a section comparing static compression results. The last chapter offers an outlook for the future, which leads the next-generation readers to tackling persistent problems.
Book Synopsis Raman Spectroscopies in Shock-compressed Materials by :
Download or read book Raman Spectroscopies in Shock-compressed Materials written by and published by . This book was released on 1983 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Spontaneous Raman spectroscopy, stimulated Raman scattering and coherent anti-Stokes Raman scattering have been used to measure temperatures and changes in molecular vibrational frequencies for detonating and shocked materials. Inverse Raman and Raman induced Kerr effect spectroscopies have been suggested as diagnostic probes for determining and phenomenology of shock-induced chemical reactions. The practicality, advantages, and disadvantages of using Raman scattering techniques as diagnostic probes of microscopic phenomenology through and immediately behind the shock front of shock-compressed molecular systems are discussed.
Book Synopsis Optical Spectroscopic Instrumentation and Techniques for the 1990s by : Bernard J. McNamara
Download or read book Optical Spectroscopic Instrumentation and Techniques for the 1990s written by Bernard J. McNamara and published by . This book was released on 1990 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Shock Compression of Condensed Matter - 2005 by : Michael D. Furnish
Download or read book Shock Compression of Condensed Matter - 2005 written by Michael D. Furnish and published by American Institute of Physics. This book was released on 2006-08-24 with total page 842 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the Proceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter, Baltimore, Maryland USA, 2005. The volume embodies the most recent research on shock compression of condensed matter and includes 363 plenary, invited, and contributed papers, all peer-reviewed. Topics include: equations of state, phase transitions, chemical reactions, warm dense matter, fracture, geophysics and planetary science, energetic materials, optical studies, and more.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1990 with total page 980 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Time-Resolved Vibrational Spectroscopy by : George Atkinson
Download or read book Time-Resolved Vibrational Spectroscopy written by George Atkinson and published by Elsevier. This book was released on 2012-12-02 with total page 419 pages. Available in PDF, EPUB and Kindle. Book excerpt: Time-Resolved Vibrational Spectroscopy covers the proceedings of the International Conference on Time-Resolved Vibrational Spectroscopy, convened in Lake Placid, New York on August 16-20, 1982. This book is organized into six sections encompassing 51 chapters. The first section deals with the theoretical and computational developments concerning Raman scattering and two-photon and optical spectroscopies. Section II focuses on the instrumentation and techniques of various time-resolved vibrational spectroscopies (TRVS), such as Raman techniques, stroboscopic interferometry, and infrared multiphoton. Sections III and IV deal with the chemical (ground and excited states) and biochemical systems of TRVS. The concluding sections discuss the theoretical principles and methods of observation of nonlinear Raman spectroscopy and surface-enhanced and colloidal Raman scattering. This book is of value to chemists, spectroscopists, and photobiologists.
Book Synopsis Tomographic State Reconstruction and Time Resolved Surface Enhanced Coherent Anti-stokes Raman Scattering in the Single Molecule Limit by : Steven Yampolsky
Download or read book Tomographic State Reconstruction and Time Resolved Surface Enhanced Coherent Anti-stokes Raman Scattering in the Single Molecule Limit written by Steven Yampolsky and published by . This book was released on 2014 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: Time-resolved, surface-enhanced, coherent anti-Stokes Raman spectroscopy (tr-SECARS) is ideally suited for preparing and probing vibrational coherences in molecules. By enhancing the local response of a single molecule with a dipolar nano-antenna, vibrational dynamics have been measured at the single molecule limit. In contrast with tr-CARS measurements in ensembles, the vibrational coherence of a single molecule is not subject to pure dephasing. It exhibits characteristic phase and amplitude noise, which allows the statistical distinction between single, few, and many molecule sources to be determined. To build on the current work, by using three unique pulses to spectrally fiter the response of the molecule, the characteristic noise can be isolated and measured background-free. If the probing of a superposition state is carried out over a real resonance, then it is possible to tomographically reconstruct the complete description of quantum dynamics in phase space representation via the Wigner Distribution Function(WDF). The WDF can be reconstructed from either the wavepacket via Wigner Transform, or an experimentally measured density, via an Inverse Radon Transform. The calculations presented here highlight the necessary conditions in order to reconstruct the WDF with delity from a proposed experiment and compare the density derived WDF with that of the wavepacket. The principle is firstly demonstrated using a Kerr gated detection of emission from an evolving state on a bound harmonic potential energy surface. The model is then explained in the case of a proposed spectrally resolved transient grating experiment (SRTG). The WDFs generated from the limiting conditions show that the reproduction delity of the experimentally derived WDF are dependent on the probe, utilized to measure the evolving superposition, and the curvature, or the vibra tional frequency of the potential energy surfaces, and the dephasing time of the vibrational superposition states. Given two potentials, I show that it is possible to optimize probe pulse parameters to improve the delity of the state reconstruction. Due to the variational principle, the negative volume of the WDF, or the Wigner hole, can only be reduced via measurements - the pulse parameters can be optimized iteratively even when the molecular potentials are not known.
Book Synopsis International Aerospace Abstracts by :
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1993 with total page 938 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Time-Resolved Raman Spectrum of Shock-Compressed Diamond by :
Download or read book Time-Resolved Raman Spectrum of Shock-Compressed Diamond written by and published by . This book was released on 1989 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of spectroscopic measurements in shock wave experiments has increased considerably in recent years. These measurements compliment the continuum data obtained from wave profile measurements and have the potential to provide an understanding of shock compressed materials at the atomic/molecular level. The present work was motivated by a need to develop complementary methods for examining time-dependent structural changes at the atomic/molecular level in shocked crystals. Raman spectroscopy is well suited for this purpose. A method has been developed for time-resolved Raman measurements under shock loading to examine the first order Raman line of diamond (Omega(0) = 1333/cm). The diamond samples were subjected to uniaxial strain along the 110 direction to a longitudinal stress of 121 kbar. The observed spectral changes are consistent with frequency shifts calculated according to phenomenological model used to describe stress effects on the zone center phonons of cubic materials.
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1990 with total page 1316 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Conceptual Design Study for Coherent Anti-Stokes Raman Spectroscopy (CARS) Diagnostics in the AMMRC Ballistic Compressor Facility by : John A. Shirley
Download or read book Conceptual Design Study for Coherent Anti-Stokes Raman Spectroscopy (CARS) Diagnostics in the AMMRC Ballistic Compressor Facility written by John A. Shirley and published by . This book was released on 1980 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: A conceptual design of a diagnostic system using coherent anti-Stokes Raman Spectroscopy (CARS) to determine time resolved temperature and species concentrations in the Army Mechanics and Materials Research Center ballistic compressor has been formulated. Performance calculations have been carried out for hydrogen which is an ideal diagnostic species for this application. Results are also presented of computer code calculations of collision narrowed spectra of nitrogen. Several pump laser systems were compared, and a high repetition frequency Nd:YAG laser was determined to be superior. Population saturation, stimulated Raman gain, and optical breakdown are not expected to pose severe limitations on laser intensity or measurement signal-to-noise ratios. Consideration is given to problems pertinent to operation of the ballistic compressor including compressor recoil, window deflections and generation of CARS from the test section windows. Finally, the possibility of using pulsed stimulated Raman gain spectroscopy (SRGS) as an alternative to CARS at the high densities typical of the ballistic compressor has been identified. SRGS appears to offer adequate measurement ability and possesses certain advantages over CARS. (Author).
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1990-11 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Time-resolved Measurement of Vibrational Coherences in the Single Molecule Limit by : Steven Yampolsky
Download or read book Time-resolved Measurement of Vibrational Coherences in the Single Molecule Limit written by Steven Yampolsky and published by . This book was released on 2014 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: Time-resolved, surface-enhanced, coherent anti-Stokes Raman spectroscopy (tr-SECARS) is ideally suited for preparing and interrogating vibrational coherences on single molecules. We have succeeded in the rst demonstration of this concept through measurements carried out on molecules attached to gold nanosphere pairs which act as plasmonic nano-dumbell antennae. The tr-SECARS traces provide unique signatures of coherent evolution in discrete ensembles. The signals are characterized by phase and amplitude noise, which can be cast in terms of amplitude probability distribution functions (PDF), which allow rigorous distinction between single, few, and many molecule coherences. We give a brief background on tr-CARS, the experimental system for carrying out tr-SECARS and the analysis of the results in terms of PDFs. The analysis makes it clear that we have, for the rst time, observed the coherent vibrational motion of a single molecule.
Download or read book Physics Briefs written by and published by . This book was released on 1993 with total page 1058 pages. Available in PDF, EPUB and Kindle. Book excerpt:
