Dioxetane intermediates readily decompose to chemiluminescent triplet carbonyls, giving rise what has been paradoxically called photochemistry in the dark. In this issue of Photochemistry and Photobiology, Bechara et al. report on mechanistic advances such a reaction. With use horseradish peroxidase for isobutyraldehyde-derived acetone, light emission from acetone singlet oxygen can be quenched...

A combined study of hydrocarbon and atomic hydrogen photochemistry is made to calculate self-consistently the Loc albedo of Jupiter. It is shown that the Loc emissions observed by Voyagers I and //can be explained by resonance scattering of sunlight. Precipitation-of energetic particles from the magnetosphere can provide the large required source of atomic hydrogen, although the contribution of...

We examined the deep UV 229 nm photochemistry of NaNO(3) in solution and in the solid state. In aqueous solution excitation within the deep UV NO(3)¯ strong π → π* transition causes the photochemical reaction NO(3)¯ → NO(2)¯ + O·. We used UV resonance Raman spectroscopy to examine the photon dose dependence of the NO(2)¯ band intensities and measure a photochemical quantum yield of 0.04 at pH 6...