H. J. BEYER AND H. KLEINPOPPEN We are pleased to present Part D of Progress in Atomic Spectroscopy to the scientific community active in this field of research. When we invited authors to contribute articles to Part C to be dedicated to Wilhelm Hanle, we received a sufficiently enthusiastic response that we could embark on two further volumes and thus approach the initial goal (set when Parts A and B were in the planning stage) of an almost comprehensive survey of the current state of atomic spectroscopy. As mentioned in the introduction to Parts A and B, new experimental methods have enriched and advanced the field of atomic spectroscopy to such a degree that it serves not only as a source of atomic structure data but also as a test ground for fundamental atomic theories based upon the framework of quantum mechanics and quantum electrodynamics. However, modern laser and photon correlation techniques have also been applied successfully to probe beyond the "traditional" quantum mechanical and quantum electrodynamical theories into nuclear structure theories, electro weak theories, and the growing field of local realistic theories versus quan tum theories. It is obvious from the contents of this volume and by no means surprising that applications of laser radiation again played a decisive role in the development of new and high-precision spectroscopic techniques.

W. HANLE and H. KLEINPOPPEN In 1919, in the first edition of Atombau and Spektrallinien, Sommerfeld referred to the immense amount of information which had been accumu lated during the first period of 60 years of spectroscopic practice. Sommer feld emphasized that the names of Planck and Bohr would be connected forever with the efforts that had been made to understand the physics and the theory of spectral lines. Another period of almost 60 years has elapsed since the first edition of Sommerfeld's famous monograph. As the editors of this monograph, Progress in Atomic Spectroscopy, we feel that the present period is best characterized by the large variety of new spec troscopic methods that have been invented in the last decades. Spectroscopy has always been involved in the field of research on atomic structure and the interaction of light and atoms. The development of new spectroscopic methods (i.e., new as compared to the traditional optical methods) has led to many outstanding achievements, which, together with the increase of activity over the last decades, appear as a kind of renaissance of atomic spectroscopy.

Progress in Analytical Atomic Spectroscopy, Volume 2 discusses several concerns regarding analytical atomic spectroscopy. The book contains five parts that tackle a specific area of concern. The first part covers the basic principles and applications of atomic fluorescence spectrometry and contains eight chapters that tackle several areas, such as optical pumping process, analytical detectability, plasma diagnostic, and Doppler-free high resolution spectroscopy. The second part discusses trace element analysis of food and beverages by atomic spectrometry. The third part covers the determination of trace metals in ultrapure water; this part contains three chapters that discuss the sources and control of contamination; techniques and methodology; and evaluation of the reliability of existing data. The following part tackles the interference in flame spectrometry, and the last part discusses emission spectroscopic analysis using cool flames. The book will be of great interest to researcher whose work involves analytical atomic spectroscopy.

A wide-ranging review of modern spectroscopic techniques such as X-ray, photoelectron, optical and laser spectroscopy, and related techniques. The book focuses on physical principles and the impact of spectroscopy on our understanding of the building blocks of matter, while examining applications to chemical analysis, photochemistry, surface characterization, environmental and medical diagnostics, remote sensing, and astrophysics. This Third Edition includes the most up-to-date developments.