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Electronic And Vibrational Dynamics Of Heme Model Compounds An Ultrafast Spectroscopic Study
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Book Synopsis Electronic and Vibrational Dynamics of Heme Model Compounds-an Ultrafast Spectroscopic Study by : Jagannadha Reddy Challa
Download or read book Electronic and Vibrational Dynamics of Heme Model Compounds-an Ultrafast Spectroscopic Study written by Jagannadha Reddy Challa and published by . This book was released on 2007 with total page 255 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ultrafast Infrared Vibrational Spectroscopy by : Michael D. Fayer
Download or read book Ultrafast Infrared Vibrational Spectroscopy written by Michael D. Fayer and published by CRC Press. This book was released on 2013-03-04 with total page 491 pages. Available in PDF, EPUB and Kindle. Book excerpt: The advent of laser-based sources of ultrafast infrared pulses has extended the study of very fast molecular dynamics to the observation of processes manifested through their effects on the vibrations of molecules. In addition, non-linear infrared spectroscopic techniques make it possible to examine intra- and intermolecular interactions and how such interactions evolve on very fast time scales, but also in some instances on very slow time scales. Ultrafast Infrared Vibrational Spectroscopy is an advanced overview of the field of ultrafast infrared vibrational spectroscopy based on the scientific research of the leading figures in the field. The book discusses experimental and theoretical topics reflecting the latest accomplishments and understanding of ultrafast infrared vibrational spectroscopy. Each chapter provides background, details of methods, and explication of a topic of current research interest. Experimental and theoretical studies cover topics as diverse as the dynamics of water and the dynamics and structure of biological molecules. Methods covered include vibrational echo chemical exchange spectroscopy, IR-Raman spectroscopy, time resolved sum frequency generation, and 2D IR spectroscopy. Edited by a recognized leader in the field and with contributions from top researchers, including experimentalists and theoreticians, this book presents the latest research methods and results. It will serve as an excellent resource for those new to the field, experts in the field, and individuals who want to gain an understanding of particular methods and research topics.
Book Synopsis Ultrafast Dynamics of Chemical Systems by : J.D. Simon
Download or read book Ultrafast Dynamics of Chemical Systems written by J.D. Simon and published by Springer Science & Business Media. This book was released on 1994-02-28 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents an up-to-date overview of developments in the field of ultrafast reaction dynamics in condensed phases. Thirteen contributions, written by leading experts, report on a variety of chemical phenomena studied by many different experimental and theoretical techniques. Topics discussed include ultrafast spectroscopic techniques; aspects of electron transfer reactions ranging from solvent effects; intermolecular and intramolecular systems, to dynamics at semiconductor surfaces; the dynamics of chemical systems using Raman spectroscopy; pericyclic photochemical rearrangements and photodissociation reactions; solvent--solute interaction dynamics; and chemical dynamics in clusters. Theoretical treatments of impulsive femtosecond pump-probe spectroscopy, solvation dynamics and electron transfer are presented. The field of ultrafast chemistry is growing rapidly. The works described in this volume provide an overview of many of the exciting areas currently under study. For researchers interested in up-to-date theoretical and experimental developments in ultrafast spectroscopy in chemical systems.
Book Synopsis Ultrafast Electronic and Vibrational Relaxation Dynamics in Iron-sulfur Proteins by : Ziliang Mao
Download or read book Ultrafast Electronic and Vibrational Relaxation Dynamics in Iron-sulfur Proteins written by Ziliang Mao and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Iron-sulfur (FeS) clusters are ubiquitous in nature and play a wide range of important roles such as electron transfer, FeS cluster biogenesis, regulation of DNA repair, small molecule sensing, and the catalysis of chemical reactions, etc. They are also involved in many essential biological processes including photosynthesis and cellular respiration. Their electronic and vibrational dynamics are important to the understanding of their rich chemistry, but difficult to characterize because of their structural complexity and the fact that a large number of states exist in close proximity. Photo-induced chemical reactions involving FeS clusters have also attracted much attention recently. However, despite many studies on the light-induced dynamics of charge insertion in FeS complexes, the directly excited photodynamics is poorly known. This knowledge is important because it helps to unravel their photochemical properties as well as to learn how to better use them in light-induced charge transfer reactions. In this dissertation, the directly photo-excited dynamics in a series of FeS clusters, including the 1Fe-4S cluster in Pyrococcus furiosus rubredoxin (PfRd), the 2Fe-2S clusters in Rhodobacter capsulatus ferredoxin VI (Rc6) and Pseudomonas putida (Pdx), the 4Fe-4S cluster in nitrogenase iron protein, as well as the 8Fe-7S P-cluster and the 7Fe-9S-1Mo FeMo cofactor in nitrogenase MoFe protein, are characterized using ultrafast laser pump probe spectroscopy. Specifically, Chapter 1 of the thesis gives an overview of FeS clusters and the significance of studying their directly-excited photo-dynamics. Chapter 2 of the thesis introduces the ultrafast laser pump-probe spectroscopic techniques that are used for the study of these FeS complexes. Chapter 3 gives a brief overview of the global analysis methodology adopted for the analysis of the ultrafast transient absorption (TA) spectroscopic data. Chapter 4 reports a study on the ultrafast electronic relaxation dynamics in the 2Fe-2S cluster of Rc6 characterized using ultrafast TA spectroscopy. Multiple ligand-to-metal charge-transfer populations were found to be induced by laser excitation that evolve to low-lying states. Two long-lived states were identified. The longer one was attributed to a potential long-range electron-transfer pathway. Chapter 5 presents the impulsive coherent vibrational spectroscopic (ICVS) study on Rc6’s vibrational relaxation dynamics. Two ICVS bands were identified, with the 484 cm-1 band attributed to excited electronic state vibration. Its time-dependent shift in frequency is also consistent with the excited state evolution characterized in Chapter 4. Chapter 6 extends the study of charge-transfer dynamics in Rc6 to a series of FeS proteins that contain 1-Fe, 2-Fe, 4-Fe, 7-Fe and 8-Fe clusters: the 1Fe-4S cluster from PfRd, the 2Fe-2S cluster from Pdx, the 4Fe-4S cluster from nitrogenase iron protein, and the 8Fe-7S P-cluster and the 7Fe-9S-1Mo FeMo cofactor from nitrogenase MoFe protein. We aim to characterize and ultimately direct critical charge-transfer dynamics in these systems, as well as to study the cluster dependence of their electronic relaxation dynamics. A competition between the cluster dependence of reorganization energies and density of states was proposed to mediate the electronic relaxation lifetimes. Chapter 7 presents the early-stage development of a novel single-shot time-resolved infrared spectroscopic system that, once functional, can be used in the study of nitrogenase reaction intermediates that are too transient for conventional vibrational spectroscopic techniques to capture. Future directions for the improvement of this system are also discussed.In summary, the transient absorption spectroscopic studies on these important FeS clusters have contributed more insights to the directly photo-induced dynamics in these clusters. Understanding these dynamics holds potential to enable the utilization of these clusters in photo-activated chemical reactions such as solar fuel production.
Book Synopsis Ultrafast Multidimensional Vibrational Spectroscopy by : Kusai Abid Merchant
Download or read book Ultrafast Multidimensional Vibrational Spectroscopy written by Kusai Abid Merchant and published by . This book was released on 2003 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Biomedical Index to PHS-supported Research by :
Download or read book Biomedical Index to PHS-supported Research written by and published by . This book was released on 1990 with total page 1060 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Watching Ultrafast Molecular Motions with 2D IR Chemical Exchange Spectroscopy by : Michael D. Fayer
Download or read book Watching Ultrafast Molecular Motions with 2D IR Chemical Exchange Spectroscopy written by Michael D. Fayer and published by World Scientific. This book was released on 2011 with total page 383 pages. Available in PDF, EPUB and Kindle. Book excerpt: This unique volume presents a comprehensive but accessible introduction to the field of ultrafast two-dimension infrared (2D IR) vibrational echo spectroscopy based on the pioneering work of Professor Michael D Fayer, Department of Chemistry, Stanford University, USA. It contains in one place a qualitative introduction to the field of 2D IR spectroscopy and a comprehensive set of scientific papers that underlie the qualitative discussion. The introductory material contains several detailed illustrations, and is based on the Centenary Lecture at the Indian Institute of Science given by Professor Fayer July 16, 2008 as part of the celebration of the 100th anniversary of the founding of IIS in Bangalore, India. The second part of the volume contains reprints of Fayer's relevant papers. The compilation will be very useful because it presents the historical background, motivation, methodology, and experimental results at a level that is accessible to the non-expert. The reprints of the scientific papers, from review articles to detailed theoretical papers, provide rigorous supporting material so that the reader can delve as deeply as desired into the subject.
Book Synopsis Encyclopedia of Chemical Physics and Physical Chemistry: Applications by : Nicholas D. Spencer
Download or read book Encyclopedia of Chemical Physics and Physical Chemistry: Applications written by Nicholas D. Spencer and published by Taylor & Francis. This book was released on 2001 with total page 734 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proteins written by David M. Leitner and published by CRC Press. This book was released on 2009-09-28 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: Computational modeling can provide a wealth of insight into how energy flow in proteins mediates protein function. Computational methods can also address fundamental questions related to molecular signaling and energy flow in proteins. Proteins: Energy, Heat and Signal Flow presents state-of-the-art computational strategies for studying energy redi
Download or read book Comprehensive Biophysics written by and published by Academic Press. This book was released on 2012-04-12 with total page 3533 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biophysics is a rapidly-evolving interdisciplinary science that applies theories and methods of the physical sciences to questions of biology. Biophysics encompasses many disciplines, including physics, chemistry, mathematics, biology, biochemistry, medicine, pharmacology, physiology, and neuroscience, and it is essential that scientists working in these varied fields are able to understand each other's research. Comprehensive Biophysics, Nine Volume Set will help bridge that communication gap. Written by a team of researchers at the forefront of their respective fields, under the guidance of Chief Editor Edward Egelman, Comprehensive Biophysics, Nine Volume Set provides definitive introductions to a broad array of topics, uniting different areas of biophysics research - from the physical techniques for studying macromolecular structure to protein folding, muscle and molecular motors, cell biophysics, bioenergetics and more. The result is this comprehensive scientific resource - a valuable tool both for helping researchers come to grips quickly with material from related biophysics fields outside their areas of expertise, and for reinforcing their existing knowledge. Biophysical research today encompasses many areas of biology. These studies do not necessarily share a unique identifying factor. This work unites the different areas of research and allows users, regardless of their background, to navigate through the most essential concepts with ease, saving them time and vastly improving their understanding The field of biophysics counts several journals that are directly and indirectly concerned with the field. There is no reference work that encompasses the entire field and unites the different areas of research through deep foundational reviews. Comprehensive Biophysics fills this vacuum, being a definitive work on biophysics. It will help users apply context to the diverse journal literature offering, and aid them in identifying areas for further research Chief Editor Edward Egelman (E-I-C, Biophysical Journal) has assembled an impressive, world-class team of Volume Editors and Contributing Authors. Each chapter has been painstakingly reviewed and checked for consistent high quality. The result is an authoritative overview which ties the literature together and provides the user with a reliable background information and citation resource
Book Synopsis Biomedical Index to PHS-supported Research: pt. A. Subject access A-H by :
Download or read book Biomedical Index to PHS-supported Research: pt. A. Subject access A-H written by and published by . This book was released on 1994 with total page 1398 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research Awards Index written by and published by . This book was released on 1989 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Biological and Biomedical Infrared Spectroscopy by : Andreas Barth
Download or read book Biological and Biomedical Infrared Spectroscopy written by Andreas Barth and published by IOS Press. This book was released on 2009 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although infrared spectroscopy has been applied with success to the study of important biological and biomedical processes for many years, key advances in this vibrant technique have led to its increasing use, ranging from characterization of individual macromolecules (DNA, RNA, lipids, proteins) to human tissues, cells and their components. Infrared spectroscopy thus has a significant role to play in the analysis of the vast number of genes and proteins being identified by the various genomic sequencing projects. Whilst this book gives an overview of the field, it highlights more recent developments, such as the use of bright synchrotron radiation for recording infrared spectra, the development of two-dimensional infrared spectroscopy and the ability to record infrared spectra at ultra fast speeds.
Book Synopsis Multi-dimensional Ultrafast Spectroscopy of Vibrational Coherence Dynamics in Excited Electronic States of Polyenes by : Jan Philip Kraack
Download or read book Multi-dimensional Ultrafast Spectroscopy of Vibrational Coherence Dynamics in Excited Electronic States of Polyenes written by Jan Philip Kraack and published by . This book was released on 2013 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ultrafast Dynamics and Interfacial Structural Orientation Investigated with Multidimensional Vibrational Spectroscopy by : Jiaxi Wang
Download or read book Ultrafast Dynamics and Interfacial Structural Orientation Investigated with Multidimensional Vibrational Spectroscopy written by Jiaxi Wang and published by . This book was released on 2019 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, two multidimensional spectroscopic methods--two-dimensional infrared (2D IR) spectroscopy and heterodyne 2D sum frequency generation (HD 2D SFG) spectroscopy--are applied to investigate ultrafast chemical exchange of organometallics in bulk solution and structural orientation of surface catalysts at interface, respectively. 2D IR spectroscopy is used to study the ultrafast chemical exchange of two organometallics compound ( Ru(S2C2(CF3)2)(CO)(PPh3)2 and Co(CNArMes2)4 ) occurring on the picosecond time scale. Combined with DFT simulation results, 2D IR provides direct evidence of the existence of various isomers. For the five-coordinate Ru complex, one isomers that serves as the intermediate of the axial-equatorial exchange was observed for the first time. Furthermore, our 2D IR works find the kinetic barriers of dynamic exchange between multiple isomers surprisingly low, consider both of the transition metal complexes under study have relatively large ligands. The low kinetic barriers are attributed to the small core-angle movement involved in the chemical exchange. 2D IR is also applied to W(CO)6/dual cavity system to observe ultrafast intercavity nonlinear polariton interactions. Combined with a newly developed theory model, we show that the nonlinear interaction is realized by shared molecular anharmonicities among cavity modes, e.g. through mode delocalization, some molecules (with anharmonicity) are coupled by cavity modes adjacent to each other. HD 2D SFG spectroscopy is used to study a model CO2 reduction catalyst, Re(diCNbpy)(CO)3Cl, as a monolayer on a gold surface. We show that short-range interactions with the surface can cause substantial line-shape differences between vibrational bands from the same molecules. This interaction can be explained as the result of couplings between CO vibrational modes of the catalyst molecules and the image dipoles on gold surface, which are sensitive to the relative distance between the molecule and the surface. Thus, by analysis of HD 2D SFG lineshape differences and polarization dependences of IR spectra, the ensemble-averaged orientation of the molecules on the surface can be determined unambiguously. The high sensitivity of HD 2D SFG spectra to short-range interactions can be applied to many other adsorbate-substrate interactions and therefore serve as a unique tool to determine adsorbate orientations on surfaces. Meanwhile, surface molecules of the monolayers can adopt conformations with many different orientations. Thus, it is necessary to describe the orientations of surface molecular monolayers using both mean tilt angle and orientational distribution, which together we refer to as orientation heterogeneity. Orientation heterogeneity is difficult to measure. In most cases, in order to calculate the mean tilt angle, it is assumed that the orientational distribution is narrow. This assumption causes ambiguities in determining the mean tilt angle and loss of orientational distribution information, which is known as the "magic angle" challenge. Using HD 2D SFG spectroscopy, we report a novel method to solve the "magic angle" challenge, by simultaneously measuring mean tilt angle and orientational distribution of molecular monolayers. Although applied to a specific system, this method is a general way to determine the orientation heterogeneity of an ensemble-averaged molecular interface.
Book Synopsis Directory of Graduate Research by : American Chemical Society. Committee on Professional Training
Download or read book Directory of Graduate Research written by American Chemical Society. Committee on Professional Training and published by . This book was released on 2005 with total page 1932 pages. Available in PDF, EPUB and Kindle. Book excerpt: Faculties, publications and doctoral theses in departments or divisions of chemistry, chemical engineering, biochemistry and pharmaceutical and/or medicinal chemistry at universities in the United States and Canada.
Download or read book Book of Abstracts written by and published by . This book was released on 2000 with total page 778 pages. Available in PDF, EPUB and Kindle. Book excerpt:
