Abstract
The cover picture shows the products arising from the dissociation dynamics of cyclobutanone (CB). Unlike simpler linear ketones, CB predissociates anomalously under the Norrish type-I (α-cleavage) reaction mechanism. Investigation of partially deuterated CB isotopomers by femtosecond time-resolved mass spectrometry (shown in the inset), in combination with ab initio calculations, characterized the S0, S1(n,π), and T1(n,π*) potential energy surfaces. The passage through the conical intersection joining the S0 and S1 surfaces follow either gradient difference (x1) or a nonadiabatic coupling (x2) vectors: Following x2, either the hot parent molecule (left) or the acyl diradical (right) is produced; following x1 either the trimethylene and CO (middle) or hot cyclopropane and CO (not shown) are formed. Find out more in the articles by Zewail et al. on pages 273–293 and 294–309.
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