Showing papers on "Slow light published in 1987"

A note on the application of BaF2 scintillators to γ-ray and charged particle detection

Abstract: Two practical aspects of the application of BaF2 crystals as detectors for nuclear radiation are considered: (1) wavelength shifting of the fast UV light component by a thin p-terphenyl layer, and (2) identification of light charged particles by measuring the intensity ratio between the fast and slow light components. Experimental tests have yielded satisfactory results in both directions.

On the velocity of light

Abstract: In view o f the numerous reviews devoted to the velocity of light which have appeared in the literature within the last decade, another is scarcely justified unless it contributes material previously unpublished or presents certain new aspects of the subject. It is hoped that for one or both of these reasons this paper may be of some value. The value of c, the velocity of propagation of electromagnetic waves, is assumed to be independent of frequency. This is generally accepted as true in a vacuum but in a refracting medium such as air, the frequency affects the velocity in the visible spectrum. For the radio frequencies the effect is negligible. This is obvious when the following formulae, adopted by the X llth General Assembly of the International Union of Geodesy and Geophysics at Helsinki, Finland, are examined. “ ... the velocity of light in vacuo is 299 792.5 ± 0.4 km/sec. ”