I feel very honored that I have been asked to write a Foreword to this book. The subject of the book Coupled cluster theory has been around for about half a century. The basic theory and explicit equations for closed-shell ground states were formulated before 1970. At the beginning of the seventies the rst ab initio calcu- tion were carried out. At that time speed and memory of computers were very limited compared to today s standards. Moreover, the size of one-electron bases employed was small, so that it was only possible to achieve an orientation in methodical aspects rather than to...

Until recently quantum chemical ab initio calculations were re- stricted to atoms and very small molecules. As late as in 1960 Allen l and Karo stated: "Almost all of our ab initio experience derives from diatomic LCAO calculations --- N and we have found in the litera- ture "approximately eighty calculations, three-fourths of which are for diatomic molecules --- There are approximately twenty ab initio calculations for molecules with more than two atoms, but there is a decided dividing line between the existing diatomic and polyatomic wave functions. Confidence in the satisfactory evaluation...

Written for students and researchers in chemistry and physics, this reference reports on recent theoretical and experimental developments in electron-molecules collisions. It presents a comprehensive and up-to-date overview of the practical aspects of electron scattering, which until now could only be found in diverse special topics reviews. This book is written in a manner that allows the non-expert reader to understand the importance of recent developments in solving practical problems in electron scattering in fields such as plasma physics, microelectronics, DNA research, and...