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Clusters as mesoscopic particles represent an intermediate state of matter between single atoms and solid material. The tendency to miniaturise technical objects requires knowledge about systems which contain a "small" number of atoms or molecules only. This is all the more true for dynamical aspects, particularly in relation to the qick development of laser technology and femtosecond spectroscopy. Here, for the first time is a highly qualitative introduction to cluster physics. With its emphasis on cluster dynamics, this will be vital to everyone involved in this interdisciplinary subject. The authors cover the dynamics of clusters on a broad level, including recent developments of femtosecond laser spectroscopy on the one hand and time-dependent density functional theory calculations on the other.
The cluster which is an ensemble of two thousands of atoms or molecules, has emerged as a completely new class of materials at the frontier of materials science. The frontier of cluster science extends so rapidly that the map of the science is renewed day by day. In order to provide basic knowledge and recent information on this growing field, 14 world-renowned scientists who are actively involved experimentally and theoretically in cluster science have written this book, which is concise, comprehensive, suitable for students at both the undergraduate and the graduate level, as well as people who work outside cluster science.
Adventures in Chemical Physics continues to report recent advances with significant, up-to-date chapters by internationally recognized researchers from a variety of prestigious academic and professional institutions such as McGill University, the University of Pennsylvania, the Lawrence Berkeley National Laboratory, Tel Aviv University, and the University of Chicago.
This book summarizes several years of research carried out by a collaboration of many groups on ultrafast photochemical reactions. It emphasizes the analysis and characterization of the nuclear dynamics within molecular systems in various environments induced by optical excitations and the study of the resulting molecular dynamics by further interaction with an optical field.
X-ray astronomers discovered the diffuse gas in clusters of galaxies about 20 years ago. It was later realized that the central gas density in some clusters, and in elliptical galaxies, is so high that radiative cooling is a significant energy loss. The cooling time of the gas decreases rapidly towards the centre of the cluster or galaxy and is less than a Hubble time within the innermost few hundred kiloparsecs. This results in a cooling flow in which the gas density rises in order to maintain pressure to support the weight of the overlying gas. The rate at which mass is deposited by the flow is inferred to be several hundreds of solar masses per year in some clusters. The fraction of clusters in which cooling flows are found may exceed 50 per cent. Small flows probably occur in most normal elliptical galaxies that are not in rich clusters. The implications of this simple phenomenon are profound, for we appear to be witnessing the ongoing formation of the central galaxy. In particular, since most of the gas is undetected once it cools below about 3 million K, it appears to form dark matter. There is no reason why it should be detectable with current techniques if each cooling proton only recombines once and the matter condenses into objects of low mass.
The emergence and spectacularly rapid evolution of the field of atomic and molecular clusters are among the most exciting developments in the recent history of natural sciences. The field of clusters expands into the traditional disciplines of physics, chemistry, materials science, and biology, yet in many respects it forms a cognition area of its own. This book presents a cross section of theoretical approaches and their applications in studies of different cluster systems. The contributions are written by experts in the respective areas. The systems discussed range from weakly (van der Waals) bonded, through hydrogen- and covalently bonded, to semiconductor and metallic clusters. The theoretical approaches involve high-level electronic structure computations, more approximate electronic structure treatments, use of semiempirical potentials, dynamical and statistical analyses, and illustrate the utility of both classical and quantum mechanical concepts.
An examination of the theoretical foundations of the kinetics and thermodynamics of solid-liquid interfaces, as well as state-of-the-art industrial applications, this book presents information on surface and colloidal chemical processes and evaluates vital analytical tools such as atomic force microscopy, surface force apparatus measurements, and photon correlation spectroscopy.
Entrepreneurship and Cluster Dynamics focuses on the origin and development of clusters and specifically on the role played by the strategic entrepreneurship in these contexts. Although separately entrepreneurship and cluster studies have already attracted the attention of academics and practitioners; this book aims to go further and offer an integrated and interactive view of topics. The cross-cutting approach is one of the main attributes of this book. In fact, the book involves a great range of organizational and economic perspectives, from social psychology to conventional applied economics disciplines. Moreover, these topics allow the use of different levels of analysis, from the individual entrepreneur behind a start-up to the structure of cluster networks, including the organizational levels. An analysis of the change and development of clusters going further than traditional functional approaches by examining how entrepreneurs and their actions are not only influenced by the cluster but also shape the cluster development, will offer an explanation of how entrepreneurship and networking entrepreneurs can foster, perhaps also inhibit, cluster development and change. Finally Entrepreneurship and Cluster Dynamics theorizes about the role of the strategic entrepreneurship in developing start-ups inside already established companies, which can play the role of broker in the cluster. Entrepreneurship and Cluster Dynamics offers a unique opportunity to academics, researchers, and students to learn about relations and interactions between entrepreneurship and cluster perspectives, providing both newly and original theoretical propositions and also rigorous conclusive empirical exercises.