Book excerpt: Materials and Measurements in Molecular Electronics presents new developments in one of the most promising areas of electronics technology for the 21st century. Conjugated polymers, carbon clusters, and many other new molecular materials have been synthesized or discovered in recent years, and some now are on the threshold of commercial application. In the development of molecular materials, detailed knowledge of the structures and electronic states of molecular aggregates is essential. The focus of this book is on the development of new molecular materials and measuring techniques based on modern spectroscopy; included are such topics as Langmuir-Blodgett films, cluster materials, organic conductors, and conjugated electroluminescent polymers.