Download or read book Strat gies de contr le laser de la dynamique mol culaire written by Catherine Lefebvre and published by . This book was released on 2008 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis studies the phenomenology of the molecular dynamics in intense laser field and, more precisely the basic mechanisms in the stabilization of a molecule with respect to the dissociation. The main line in these works concerns the dynamics of the Floquet resonances in intense laser field. Simple and generic strategies are proposed and applied to the one-dimension model of H2+ molecular ion for which time-dependent wavepacket calculations have been performed. Starting from the synchronization mechanism between the wavepacket movements and those of the potential energy curves, originally established in the infrared spectral domain where the quasi-static picture is used, we propose a scenario to extend its application to the ultraviolet-visible spectral domain where the multiphotonic picture is valid. In the Floquet representation, we observe a breathing of the dressed potential energy curves at the one-photon crossing following, not the carrier-wave oscillations, but those of the envelope of frequency lying in the infrared. We are particularly interested in the dependance of the molecular dynamics on the phase of the envelope and we use a recent reformulation of the Floquet theory to establish the origin of the dynamical role of the absolute phase. By a simple optimization of the optical parameters, we take advantage of the different basic mechanisms in the multiphotonic and quasi-static pictures in order to stabilize the molecule with respect to the dissociation via an adiabatic transfer of an initial vibrational state onto a resonance. Even more efficiently, this transfer is done onto a zero-width resonance. All these multiphotonic processes are then applied to the problem of the dissociative ionization of H2 for which we study the dynamics of H2+ molecular ion under a femtosecond near-infrared laser pulse, previously prepared from the neutral molecule by an extreme ultraviolet attosecond pulse. The study of the adiabatic or non-adiabatic character of the preparation of the ion and its subsequent evolution under the infrared pulse allows one to retrieve a signature of the dynamics of the Floquet resonances and an indirect image of the initial vibrational wavepacket. This type of molecular dynamics imaging brings a theoretical support for interpretation of experimental results concerning the photofragment kinetic energy spectra. Finally, using the same reformulation of the Floquet theory, we demonstrate the existence of a wavepackets interferometry, the wavepackets being individually prepared successively by each attosecond pulse in a train. This new scheme of an extreme ultraviolet attosecond pump pulse combined with an infrared femtosecond probe pulse gives in principle a strategy to characterize attosecond pulse trains.

Download or read book Unstable States in the Continuous Spectra Analysis Concepts Methods and Results written by and published by Academic Press. This book was released on 2010-11-25 with total page 565 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Quantum Chemistry presents surveys of current developments in this rapidly developing field. With invited reviews written by leading international researchers, each presenting new results, it provides a single vehicle for following progress in this interdisciplinary area. - Publishes articles, invited reviews and proceedings of major international conferences and workshops - Written by leading international researchers in quantum and theoretical chemistry - Highlights important interdisciplinary developments

Download or read book Contr le de la dynamique rotationnelle de mol cules par impulsions laser ultra br ves mises en forme written by Mathias Renard and published by . This book was released on 2004 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce manuscrit présente différentes études s'inscrivant dans la thématique du contrôle cohérent. Nous établissons, aussi bien théoriquement qu'expérimentalement, la possibilité de manipuler finement la dynamique rotationnelle de molécules linéaires. Afin d'opérer cette manipulation, les impulsions ultra-brèves sont façonnées par un dispositif de mise en forme. Son principe et sa mise en place sont décrits de manière détaillée. La dynamique rotationnelle de la molécule linéaire d'azote (N2) est manipulée en jouant sur l'excitation relative entre les composantes rotationnelles paires et impaires du paquet d'ondes en régime de champ faible. Pour cela, nous avons opté pour une modulation de phase périodique bien définie de l'impulsion excitatrice. Une analyse temporelle vient éclairer sous un autre angle les résultats expérimentaux. Une extension de la stratégie de contrôle au régime de champ fort permet de contrôler la dynamique de l'alignement moléculaire.

Download or read book Dynamique mol culaire en pr sence d impulsions laser ultra br ves et super intenses written by Hakima Abou-Rachid and published by . This book was released on 1994 with total page 486 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Journal de physique written by and published by . This book was released on 2004 with total page 1204 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dynamique de l alignement et de l orientation mol culaire induite par laser simulations num riques sur HCN en champ infrarouge written by and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book COLOQ 8 written by Alain Aspect and published by . This book was released on 2004 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Virtual Screening written by Christoph Sotriffer and published by John Wiley & Sons. This book was released on 2011-03-31 with total page 774 pages. Available in PDF, EPUB and Kindle. Book excerpt: Drug discovery is all about finding small molecules that interact in a desired way with larger molecules, namely proteins and other macromolecules in the human body. If the three-dimensional structures of both the small and large molecule are known, their interaction can be tested by computer simulation with a reasonable degree of accuracy. Alternatively, if active ligands are already available, molecular similarity searches can be used to find new molecules. This virtual screening can even be applied to compounds that have yet to be synthesized, as opposed to "real" screening that requires cost- and labor-intensive laboratory testing with previously synthesized drug compounds. Unique in its focus on the end user, this is a real "how to" book that does not presuppose prior experience in virtual screening or a background in computational chemistry. It is both a desktop reference and practical guide to virtual screening applications in drug discovery, offering a comprehensive and up-to-date overview. Clearly divided into four major sections, the first provides a detailed description of the methods required for and applied in virtual screening, while the second discusses the most important challenges in order to improve the impact and success of this technique. The third and fourth, practical parts contain practical guidelines and several case studies covering the most important scenarios for new drug discovery, accompanied by general guidelines for the entire workflow of virtual screening studies. Throughout the text, medicinal chemists from academia, as well as from large and small pharmaceutical companies report on their experience and pass on priceless practical advice on how to make best use of these powerful methods.

Download or read book Dissertation Abstracts International written by and published by . This book was released on 2002 with total page 858 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Soil Analysis written by J. Gautheyrou and published by CRC Press. This book was released on 2001-01-01 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this book is to provide a better understanding of tools for soil analysis in order to use them more efficiently. It covers sampling problems as well as difficulties relating to actual analysis and quality control.

Download or read book Advances in Spectroscopic Monitoring of the Atmosphere written by Weidong Chen and published by Elsevier. This book was released on 2021-06-09 with total page 634 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Spectroscopic Monitoring of the Atmosphere provides a comprehensive overview of cutting-edge technologies and monitoring applications. Concepts are illustrated by numerous examples with information on spectroscopic techniques and applications widely distributed throughout the text. This information is important for researchers to gain an overview of recent developments in the field and make informed selections among the most suitable techniques. This volume also provides information that will allow researchers to explore implementing and developing new diagnostic tools or new approaches for trace gas and aerosol sensing themselves. Advances in Spectroscopic Monitoring of the Atmosphere covers advanced and newly emerging spectroscopic techniques for optical metrology of gases and particles in the atmosphere. This book will be a valuable reference for atmospheric scientists, including those whose focus is applying the methods to atmospheric studies, and those who develop instrumentation. It will also serve as a useful introduction to researchers entering the field and provide relevant examples to researchers and students developing and applying optical sensors for a variety of other scientific, technical, and industrial uses. - Overview of new applications including remote sensing by UAV, laser heterodyne radiometry, dual comb spectroscopy, and more - Features in-situ observations and measurements for real-world data - Includes content on leading edge optical sensors

Download or read book Artificial Intelligence in Society written by OECD and published by OECD Publishing. This book was released on 2019-06-11 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: The artificial intelligence (AI) landscape has evolved significantly from 1950 when Alan Turing first posed the question of whether machines can think. Today, AI is transforming societies and economies. It promises to generate productivity gains, improve well-being and help address global challenges, such as climate change, resource scarcity and health crises.

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1996 with total page 694 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ICREEC 2019 written by Ahmed Belasri and published by Springer Nature. This book was released on 2020-06-10 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.

Download or read book Basic Concepts for Simple and Complex Liquids written by Jean-Louis Barrat and published by Cambridge University Press. This book was released on 2003-03-27 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presenting a unified approach, this book focusses on the concepts and theoretical methods that are necessary for an understanding of the physics and chemistry of the fluid state. The authors do not attempt to cover the whole field in an encyclopedic manner. Instead, important ideas are presented in a concise and rigorous style, and illustrated with examples from both simple molecular liquids and more complex soft condensed matter systems such as polymers, colloids, and liquid crystals.

Download or read book Surface Tension in Microsystems written by Pierre Lambert and published by Springer Science & Business Media. This book was released on 2013-08-31 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes how surface tension effects can be used by engineers to provide mechanical functions in miniaturized products (1 mm). Even if precursors of this field such as Jurin or Laplace already date back to the 18th century, describing surface tension effects from a mechanical perspective is very recent.brThe originality of this book is to consider the effects of capillary bridges on solids, including forces and torques exerted both statically and dynamically by the liquid along the 6 degrees-of-freedom.brIt provides a comprehensive approach to various applications, such as capillary adhesion (axial force), centering force in packaging and micro-assembly (lateral force) and recent developments such as a capillary motor (torque).

Download or read book Physics of Amphiphilic Layers written by Jacques Meunier and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: Amphiphilic layers play essential roles in the behaviour of a great variety of disperse systems such as micelles, microemulsions and vesicles. They can also exist as isolated mono- or bilayers, or constitute extended liquid crystalline structures. Although the properties of these different systems may at first sight seem unrelated, theoretical interpretations of them depend on several common concepts. This was the reason for bringing together scientists working in this area for the International Winter School on the Physics of Amphiphilic Layers, which was held at Les Houches, 10-18 February, 1987. The topics treated in the proceedings volume are mono- and bilayers, interactive forces between layers (with special emphasis on steric forces), ordered structures (in particular swollen lamellar phases and defects), vesicles, micelles (including polymer-like systems), microemulsions (especially random bicontinuous structures) and porous media. The importance of thermal fluctuations in the amphiphilic layers is stressed. Recent results are presented and literature references allow readers not familiar with the subject to find any background information they require.