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ENGLISH

Understanding Luminescence Spectra And Efficiency Using Wp And Related Functions

by Charles W. Struck e William H. Fonger

59,61€ + 10% CARD

 There are both a remote and a proximate history in the development of this book. We would like to acknowledge first the perceptiveness of the technical administrators at RCA Laboratories, Inc. during the 1970s, and in particular Dr. P. N. Yocom. Buoyed up by the financial importance of yttrium oxysulfide: europium as the red phosphor of color television tubes, they allowed us almost a decade of close cooperation aimed at understanding the performance of this phosphor. It is significant that we shared an approach to research in an industrial laboratory which allowed us to avoid the lure of "first-principles" approaches (which would have been severely premature) and freed us to formulate and to study the important issues directly. We searched for a semiquantitative understanding of the properties observed in luminescence, i. e. , where energy absorption occurs, where emission occurs, and with what efficiency this conversion process takes place. We were aware that the nonradi ative transition rates found in practice vary enormously with temperature and, for a given activator, with small changes in its environment. We traced the source of this enormous variation to the magnitude of the vibrational overlap integrals, which have strong dependences on the rearrangements occurring during optical transitions and on the vibrational number of the initial electronic state. We were willing to excise from the problem the electronic aspects - the electronic wavefunctions'' and their transition integrals -by treating them as parameters to be obtained from the experimental data.
ENGLISH

Exafs: Basic Principles And Data Analysis

by Boon K. Teo

59,61€ + 10% CARD

 The phenomenon of Extended X-Ray Absorption Fine Structure (EXAFS) has been known for some time and was first treated theoretically by Kronig in the 1930s. Recent developments, initiated by Sayers, Stern, and Lytle in the early 1970s, have led to the recognition of the structural content of this technique. At the same time, the availability of synchrotron radiation has greatly improved both the acquisition and the quality of the EXAFS data over those obtainable from conventional X-ray sources. Such developments have established EXAFS as a powerful tool for structure studies. EXAFS has been successfully applied to a wide range of significant scientific and technological systems in many diverse fields such as inorganic chemistry, biochemistry, catalysis, material sciences, etc. It is extremely useful for systems where single-crystal diffraction techniques are not readily applicable (e.g., gas, liquid, solution, amorphous and polycrystalline solids, surfaces, polymer, etc.). Despite the fact that the EXAFS technique and applications have matured tremendously over the past decade or so, no introductory textbook exists. EXAFS: Basic Principles and Data Analysis represents my modest attempt to fill such a gap. In this book, I aim to introduce the subject matter to the novice and to help alleviate the confusion in EXAFS data analysis, which, although becoming more and more routine, is still a rather tricky endeavor and may, at times, discourage the beginners.
ENGLISH

Variety In Coordination Modes Of Ligands In Metal Complexes

by Shinichi Kawaguchi

59,61€ + 10% CARD

 Metal complexes play important roles as catalysts or other participants in synthetic and biological reactions. Substrates and sometimes attacking reagents also are activated through coordination with metal atoms or ions. In these events the natures not only of the central metals but also of ancillary ligands exert important influences on the stability and reactivity of the coordinated substrates. A ligand in general can adopt various coordination modes depending on its chemical environment, thus functioning as a probe. The number of coordination modes increases with increasing complexity of the ligand. In this book it is shown that even the simplest mono- and diatomic ligands such as H, CO, and N2 exhibit a variety of coordination modes, which are related to their reactions. The thiocyanate anion is taken up as a representative of the triatomic ambidentate ligands, and factors influencing the preferences for N- und S-bonding are summarized. Coordination chemistry of ß-dicarbonyl compounds is a highlight of this book. Acetylacetone, one of the most familiar Werner ligands, is shown to favor -carbon and n-allylic bonding in many instances. Its versatile behaviour in changing coordination modes is revealed.
ENGLISH

Lasers And Excited States Of Rare Earths

by Christian K. Jorgensen e Renata Reisfeld

59,61€ + 10% CARD

 The possibility of stimulated light emission was discussed by Einstein in 1917, eight years before the quantum-mechanical description of energy levels of many-electron systems. Though it is imperative to use samples having optical properties greatly different from the stan dard continuous spectrum of opaque objects ("black body" radia tion) it is not always necessary to restrict the study to monatomic entities. Thus, spectral lines can be obtained (in absorption and in emission) from lanthanide compounds, containing from one to thir teen 4f electrons going from trivalent cerium to ytterbium, that are nearly as sharp as the ones from gaseous atoms. However, the presence of adjacent atoms modifies the simple picture of an isolated electron configuration, and in particular, it is possible to pump excited levels efficiently by energy transfer from species with intense absorption bands, such as the inter-shell transitions of other lanthanides and of thallium(I), lead(II) and bismuth(III) or the electron transfer bands of the uranyl ion or other complexes. On the other hand, it is possible to diminuish the mUlti-phonon relaxation (competing with sharp line luminescence) by selecting vitreous or crystalline materials with low phonon energies. Obviously, one cannot circumvent the conservation of energy by lasers, but they may have unprecedented consequences for the future by allowing nuclear fusion of light elements, effects of non-linear optics and time-resolved spectroscopy, besides the more conventional applications of coherent light beams with negligible angular extension.
ENGLISH

Modern Hot-Atom Chemistry And Its Applications

by E. Tachikawa e T. Tominaga

59,61€ + 10% CARD

 Hot-atom chemistry is a unique field of chemistry dealing with highly excited chemical species resulting from nuclear reactions or radioactive decay processes.
ENGLISH

Inorganic Stereochemistry

by D. L. Kepert

59,61€ + 10% CARD

 Molecular stereochemistry is a fundamental aspect of all areas of chemistry. The present book evolved naturally from a series of articles written by Professor Kepert for Progre88 in Inorganic Ohemi8try, elucida- ting aspects of the stereochemistry of inorganic compounds of co- ordination numbers 4-12.
ENGLISH

Electrochemistry Of Solids - An Introduction

by Hans Rickert

59,61€ + 10% CARD

 Since then, the subject of the electro- chemistry of solids has developed further and a large number of new solid electrolytes have been discovered.
ENGLISH

Magnetic Properties Of Transition Metal Compounds

by A. J. Van Duyneveldt e R. L. Carlin

118,59€ + 10% CARD

 The major purpose of this book is to direct chemists to some of the recent work of physicists, and in particular to a lengthy exposition of magnetic ordering phenomena. Chemists have long been interested in magnetic interactions in clusters, but many have shied away from long-range ordering phenomena.
ENGLISH

Crystallographic Statistics In Chemical Physics - An Approach To Statistical Evaluation Of Internuclear Distances In Transition Element Compounds

by Fedor Valach, Jan Ondracek e Milan Melnik

59,61€ + 10% CARD

 This book introduces the concept of crystallographic non-rigidity and asymmetry of the transition elements as centralatoms organometallic compounds.
ENGLISH

Mossbauer Spectroscopy And Transition Metal Chemistry

by A. Trautwein, P. Gutlich e R. Link

59,61€ + 10% CARD

 We hope that the book will be useful not only to non-Mossbauer special- ists with problem-Oriented activities in the chemistry and physics of transition elements, but also to those actively working in the field of Mossbauer spectroscopy on systems (compounds as well as alloys) of transition elements.
ENGLISH

Inorganic Thermochromism

by Kozo Sone e Yutaka Fukuda

59,61€ + 10% CARD
ENGLISH

Inorganic Molecular Dissymmetry

by Yoshihiko Saito

118,59€ + 10% CARD
ENGLISH

Interventional Cardiology And Angiology

~~60,82€~~ 42,57€ 30% OFF

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ENGLISH

Vth International Congress On X-Ray Optics And Microanalysis - Tubingen, September 9th-14th, 1968

OUT OF STOCK OR NOT AVAILABLE
ENGLISH

Electrochemistry Of Solids - An Introduction

by Hans Rickert

OUT OF STOCK OR NOT AVAILABLE

 Since then, the subject of the electro- chemistry of solids has developed further and a large number of new solid electrolytes have been discovered.

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