The absorption characteristics of cyclobutanone vapour irradiated with a pulsed CO2 TEA laser at fluences of 0.5-1.5 J cm-2have been studied over the pressure range 0.3 to 20 Torr using both joulemeter and opto-acoustic measurements of the absorbed energy. Under these conditions the product concentration for the two subsequent decomposition channels into ethene + ketene and cyclopropane + CO were determined. Above ˜ 3 Torr the results are consistent with a thermally equilibrated system whereas at lower pressures a distinct enhancement of the lower energy pathway to ethene occurs, indicative of a non-Boltzmann energy distribution. © 1980.
|Number of pages||5|
|Journal||Chemical Physics Letters|
|Publication status||Published - 15 Mar 1980|