Infrared multiphoton dissociation of tetramethylsilane: formation of electronically excited trimethylsilyl radical

✍ Scribed by C.M. Michael; Y. Lazarou; P. Papagiannakopoulos

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 521 KB
• Volume: 194
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(92)86075-s

✦ Synopsis

The infrared multiphoton excitation of tetramethylsilane and chloromethyltrimethylsilane molecules, under collision-free and collisional conditions, with a tunable CO2 laser resulted in an intense ultraviolet-visible luminescence. The spectral analysis and the time profile of this luminescence has been studied, in order to provide a reasonable mechanism of its formation. Lifetime measurements of this emission were performed at various alkylsilane pressures, and its radiative lifetime was found to be 365 + 10 ns. The quenching rates of this luminescence by several colliders were also determined from lifetime measurements. The proposed mechanism leading to the production of this chemiluminescence involves the formation of electronically excited trimethylsilyl radicals ( 1 2E state) via an inverse electronic relaxation process.