LASER-INDUCED AEROSOL-PARTICLE FORMATION FROM A GASEOUS MIXTURE OF TRIMETHYL(2-PROPYNYLOXY) SILANE AND ACROLEIN

Upon exposure to N-2 laser light, a gaseous mixture of trimethyl( 2-pr opynyloxy) silane (TMPSi) and acrolein (AC) produced sedimentary spher ical aerosol particles with a mean diameter of approximate to 0.5 mu m . The IR spectrum of the sedimentary aerosol particles showed bands ch aracteristic of polyacrolein, and XPS showed two Si 2p bands assignabl e to elemental silicon and silicon bonded in an organosilicon polymer, indicating that TMPSi was incorporated into the parent aerosol partic les of polyacrolein, and cleavage of Si-C and Si-O bonds took place in the aerosol particles. The nucleation process of the aerosol particle s was investigated by measuring He-Ne laser light intensity scattered by the aerosol particles as formed under irradiation with N-2 laser Li ght. (C) 1998 Elsevier Science S.A. All rights reserved.