Optical properties of small inorganic and organic metal particles

Alkali halide clusters and microcrystals

This work was supported in part by a contract between the Air Force Cambridge Research Laboratories and The Ohio State University research foundation. $^{1}$ A. M. Karo and J. R. Hardy, U. of California Lawrence Radiation Laboratory, report no. UCRL-14822 (1966).

THE MEASUREMENT AND CALCULATION OF THE FAR INFRARED OPTICAL PROPERTIES OF KCl AND KBr.

Der Lichtdruck auf Kugeln von beliebigem Material

Optical properties of clusters have been exploited already for more than one and a half millenia before clusters have been identified as special entities and cluster science been established as an own field of research. As a matter of fact, ancient technologists eagerly produced clusters in glass from empirical recipes (of course not knowning the microscopic structure and processes) because of their beautiful and splendid colors whose brilliance fascinated people. It is not surprising that in particular the purple color of Au and Cu clusters, having been difficult to produce and, hence, rare, were regarded as the emperors color. One of the probably unsurpassed treasures of the antiquity concerning color beauty is a Roman goblet of the fourth century, now to be seen in the British Museum in London, which shows the Greek saga of Lykurgos. Its fame is due to the shining colors generated by a composition of Ag and Au clusters [4.1].

R. Kälin

Papers

Size effects on the spectral thermal emissivity of alkali halides