The first book devoted to a systematic consideration of electronic excitations and electronic energy transfer in organic
crystalline multilayers and organics based nanostructures(quantum wells, quantum wires,
quantum dots, microcavities). The ingenious combination of organic with inorganic materials in one and the
same hybrid structure is shown to give qualitatively new opto-electronic phenomena, potentially important for
applications in nonlinear optics, light emitting devices, photovoltaic cells, lasers and so on. The book will be useful not only
for physicists but also for chemists and biologists.To help the nonspecialist reader,
three Chapters which contain a tutorial and updated introduction to the physics of electronic excitations in organic
and inorganic solids have been included.
* hybrid Frenkel-Wannier-Mott excitons
* microcavities with crystalline and disordered organics
* electronic excitation at donor-acceptor interfaces
* cold photoconductivity at donor-acceptor interface
* cummulative photovoltage
* Feorster transfer energy in microcavity
* New concepts for LEDs

Atomic hydrogen, the simplest of all stable atoms, has been a challenge to spectroscopists and theoreticians for many years. Here, as in similar systems like positronium, muonium and possibly helium, the accuracy of theoretical predictions is comparable to that of experimental measurements. Hence exciting confrontations are possible. This together with expected large experimental improvements explains the strong interest in the symposium held in Pisa in June-July 1988. The resulting book completely covers the precision spectroscopy of atomic hydrogen and hydrogen-like systems, and also discusses aspects of QED and the influence of strong fields.

A century after his birth, Ettore Majorana is rightfully considered one of the greatest physicists of the first half of the last century. With this volume the Italian Physical Society presents a collection of Ettore Majorana's scientific papers in the original language and, for the first time -- with three exceptions -- translated into English. Each paper is then followed by a comment in English of an expert in the scientific field.