Photolyse du trans-butène-2 vers 7.1 eV

Abstract

The photolysis of trans-2-butene (tB-2) was studied at 7.10–7.11 eV (174.5–174.3 nm) in a static system using a nitrogen lamp. The main primary photochemical processes are the C—C split leading to the formation of CH3 and CH3CHCH radicals, the primary quantum yield, Ф = 0.33 and the molecular or/and atomic hydrogen elimination, Ф = 0.27 with concurrent formation of 1,3-butadiene. The excited CH3CHCH radicals isomerize, followed by aliene formation, or are stabilized by collisions. The stabilization of the photoexcited tB-2 molecules is an inefficient process in the pressure region studied (10–20 000 N m−2). Only small isomerization of tB-2 was observed below 133 N m−2[Formula: see text]