Near UV multiphoton dissociation of organosilanes with picosecond and nanosecond laser pulses

Abstract

Multiphoton dissociation undergone by the organosilanes 2-chloroethenylsilane and phenylsilane upon irradiation with laser pulses of 20 ps and 4ns duration at 290 nm has been studied through detection of their spontaneous fluorescence. Atomic Si (4s 1S0 1) emissions are reported, together with the Swan bands of C2. Additionally, SiH2 formed in a two-photon process was observed by laser-induced fluorescence techniques in the photolysis of 2-chloroethenylsilane. The results show a strong selectivity when compared to those obtained previously for far UV irradiation around 200 nm and provide insight into the nature of the photodissociation mechanisms, where the SiH2 fragment plays a central role. © 2000 Elsevier Science S.A. All rights reserved.This work was supported by the Spanish Project DGICYT (PB96-0844-C02-01). R. de Nalda thanks Ministerio de Educación y Cultura (Spain) for a scholarship.Peer Reviewe